No Ontological Inertia

""To think that an end to the hostilities would be called the very day after the source of the troubles was defeated... it's almost ridiculously efficient.""

- Takamichi, Mahou Sensei Negima

Ontological Inertia is the tendency stuff has to continue being stuff. Things, in general, keep existing even when we're not looking at them. (Except, of course, for TV shows, which have the nasty habit of going off the air if people stop watching them...)

Writers often forget about this for some reason, and assume that the creator of a thing maintains some sort of existential tie to the thing created, and his continued survival is necessary. That is, if the creator is destroyed, it is "only natural" that the creation will pop out of existence, or preferably, explode.

Whatever damage or curse the Big Bad has done disappears when it is defeated, instantly resulting in sunlight, birds and happy little flowers.

Note that this is reasonable for things coming from a computer program such as a game or an application, if the game exits, unless it has saved its state and restored the state at the time it quit, the program will start over in the state it was when it was first started; it has no "memory" of its prior existence and thus lacks ontological inertia. This, of course, allows people to "save and restore" a game in order to try something that might get them killed. Games that are multi-player will have ontological inertia because the game continues running on the server and unless it is shut down, the game continues in whatever form it is running as.

Magic often lacks ontological inertia. Continuous effort has to be applied to keep it working against the natural order of things. Since magic follows its own rules the writer made up, not those of real physics, this can be entirely justified. In fact, you could think of this as a thaumatic gravity. For some reason something created magically needs to be held in that state as you would hold a stone in your hand to prevent it dropping on the ground. Since there was no magic involved with the pre-existing stuff, it seems weightless and floats anyway. Of course, that's nonsense, but more believable. Moreover, most magics in a work are powered by some kind of Mana in theory. Like a machine ceasing to function when its power source is cut off, it is easy to understand that magic will also cease to function when the mana supply is destroyed.

Some television and movie illnesses lack ontological inertia. Especially viruses and poisons. This is less plausible. Once the patient is given the Magic Antidote, they are instantly cured, and all symptoms and, more importantly, all lesions, damage to internal organs or neurological damage already caused by the sickness vanish, sometimes within mere moments, while the audience is watching.

Can be somewhat justified/caused by stage-magic, and a confusion over existence and visible existence for tasks that are extremely complex, or require active control, or external power (even if this is not obvious to the audience) because that is how it sometimes works in real life. For example a hidden bomb might still exist but if they kill the bad guy before he sets it off by remote, then the visible existence of the explosion will not happen. For all practical purposes it will be as if the bomb has 'ceased to exist' once they kill the creator.

Extremely common in fiction, as it results in visible victories upon completion of a task.

See also Liquid Assets and No Immortal Inertia—though these are more about Life Energy, they still represent states that can be easily restored to "normal". This is a type of Reset Button. Logically, this is one of the primary justifications for Load Bearing Bosses.

Anime & Manga

 * Time Travel subversion: At the end of the first season of Sailor Moon, Usagi seemed to turn back time/erase everyone's memories of the past year. However, her two friends who had become a couple during that time... still are. To be fair, this was an example of a premature Grand Finale retooled when the series continued.
 * On the other hand, this was usually played straight with Monster of the Week fights. In one episode, the MotW was conjured from a camera and could trap whoever she fired a beam at in a photograph (this included the VotW, Luna, Sailor Mercury and Sailor Mars); all of them were returned to normal as soon as Sailor Moon destroyed the monster.
 * Crystal Tokio also counts. In the second season, it was poisonous wasteland. But when Chibiusa returns after defeating the villains, it's a beautiful place.
 * From an OVA of The Slayers: a magic mirror is used to make clones of Lina and Naga, prompting the duo to smash the mirror on the assumption that it would destroy the embarrassingly pacifistic and modest (respectively) clones. Subversion: Not only did it not work, but the clones complained about Lina's over-reliance on violence as a result.
 * In Tengen Toppa Gurren Lagann, A less noticeable example happened at the conclusion of the first half of the series, when  was defeated and all of the Gunmen surrounding his base shut down. However, this was apparently because Gunmen piloted by Beastmen ran on outside power sources (usually the sun) and their boss was currently that energy source (this battle happening mostly at night).
 * In Martian Successor Nadesico, this is apparently what
 * No Ontological Inertia is critical to the plot of Fate/stay night. The seven Masters fight by commanding their Servants—magical beings so powerful and unpredictable that beating one is nearly impossible, even for another Servant. But if you kill a Master or otherwise eliminate his Command Spells, his Servant can only keep existing for a little while (and it's much weaker during that time). Thus the way to win the Holy Grail War is to take the enemy Masters out of commission—and needless to say, only the good guys (Shirou and Rin) are particular as to how.
 * The Assassin-class Servants actually rely on this. Other classes could potentially win the Holy Grail War simply by beating the snot out of other Servants in direct combat and forcing the now-helpless Master to surrender. Assassins, however, tend to fare poorly in direct combat, and possess abilities that are more effective against normal humans than Servants. Thus, Masters of Assassins are usually supposed to target other Masters with their Servants than other Servants.
 * Another similar case is familiars. Generally, if the familiar's master dies, the familiar will also die shortly/immediately afterward. A familiar needs mana in order to live. Len is an exception as she has a partially demonic nature and is also a dream demon, meaning she can gather mana for herself in order to continue living. Possibly justified in this case as it's basically akin to eating/starvation and Len simply knows how to feed herself.
 * All Nasuverse examples avert this trope if you have any real familiarity with how that world works. Gaia, the will of the planet, exerts the force necessary to take anything of magical origin out of existence. In other words, magic has ontological inertia, but the planet destroys it constantly in the same way that it deals with normal inertia through the force of gravity.
 * In fact, the only case in which things of non-natural origin appear to have ontological inertia is in the case of the Crystal Valley, created by Type Mercury/ORT. The idea is that ORT's very existence overpowers Gaia and overwrites the natural laws of Earth with its own.
 * Applied to the Digimon Taken for Granite in episode 17 of Digimon Adventure, even though the character was not even dead.
 * Though he was blasted a rather far way away, so it might still count.
 * The Dark Masters reconfigured the data of the Digital World into Spiral Mountain, each ruling a section of it. When the Dark Master controling that section was killed, the data would instantly return to the Digital World proper. Justified, as their power was what was holding it together and without them, the section collapsed.
 * In the Yes! Pretty Cure 5 movie, when Cure Aqua kills Dark Aqua, the latter's sword (which had been knocked out of her hand) vanishes behind her. More significantly, the whole reason she's Cure Aqua in the first place is related to a case of this.
 * Subverted in Magical Girl Lyrical Nanoha where, upon hearing how, naturally assume that, , they'd disappear with her. Not so, says , as she'd transferred their links to her over to . They're
 * Played straight/invoked in Magical Record Lyrical Nanoha Force:
 * Reversed in My Otome, where a SLAVE's death results in the death of its Master, and an Otome's death results in the death of its Master. Making them possibly the worst bodyguards ever.
 * Though Otome are to bodyguards what a tactical nuke is to a pea shooter. Their lives being linked with their masters was actually designed to discourage warfare as well as avoiding civilian involvement. As it'd be the nobility and rulers putting their lives on the line as opposed to their subjects.
 * Jutsu in Naruto seem to be like this. The reason for this is that every jutsu is powered by a person's chakra which is generated by their body. When they die, their body ceases to produce chakra and anything dependent on their chakra to maintain its form breaks down.
 * When Team Gai fought the Kisame clone, the first thing he did was puke out a whole lake's worth of water and when he was defeated the water disappeared.
 * In the Sanbi Arc of Shippuden, Guren gives Yuukimaru a Camelia Flower encased in crystal via her Crystal style jutsu. She tells him that it will never wilt as long as she's alive. During one of her battles with the Sanbi, the crystal cracked when she was wounded.
 * 's men were able to tell he died when disappear.
 * Averted with Kimimaro's bones. Even after he died, the forest of bones he created remained intact. This is likely due to the fact that, while created with his chakra, the bones still had their own strength without the chakra.
 * Averted with, as it is eventually clarified that the will not stop even if the user is killed; the user must actually undo it themself. Thus his opponents seek to capture him alive and use genjutsu to trick him into stopping them himself.
 * Half of the tension and drama in the entire Dragonball series is based around the Dragonballs becoming useless stones if their creator dies. For most of the series this is Piccolo/Kami, but Guru's remaining lifespan is a significant plot point in the Namek saga.
 * Bizarrely, a Dragonball Z special ("The Plot to Destroy the Saiya-Jins") did this with what appeared to be completely ordinary machines. Nobody seems to find this odd—perhaps the weird properties of the Dragonballs have jaded them.
 * The Oozaru transformation is similar. It's triggered by glands at the base of the tail activating when a certain level of lunar radiation is absorbed through the eyes, but apparently requires a constant supply to maintain. Chop off the tail or destroy the source of the moonlight, and they'll revert back instantly, and in one case, the detached tail is seen to do the same. This is slightly odd as reverting back as soon as the moon explodes combined with the transformation triggered by seeing the moon seems to imply that the Oozaru would change back as soon as they glanced away from the moon, but whatever. The only exception is the Movie Tree of Might which apparently changes the rules around a bit for the convenience of the villain. Cutting the tail off still works in a flash, though.
 * Later on in the Buu saga, Dabura Turns out the poor King of Demons didn't accomplish anything at all.
 * Actually I think was brought back by the dragonball wish that was meant to bring back  victims.
 * Mahou Sensei Negima! naturally plays this for comedy and Fan Service. Takane constantly suffers Clothing Damage to the point that it becomes a Running Gag, and attempts to combat it by creating a magical set of clothes. Turns out that the clothes can't be maintained while one is unconscious. She learned this the hard way, after getting knocked out by Negi during the Tournament Arc, in a stadium full of people. It's played seriously later, when, causing Takamichi to give the page quote. Something of a subversion, as the end of the chapter implies that the problems are not over.
 * A possible example occurs in Code Geass, where one of the only cases of someone actually breaking geass occurs after the death of the one who used it. Still, it is not made clear if  was due to a weakening of the geass or Heroic Willpower. Lelouch seems to think that, suggesting that some ontological inertia was in play.
 * Also, when Rolo, But is also possible that this particular require constant concentration; so it won't have a permanent effect, like most others seen in the series.
 * In Hellsing, all the ghouls (zombies created when a vampire bites a non-virgin human) die when you slay the vampire who created them in the first place (a common theme in vampire stories; see below). That is, unless it's an artificial vampire created by surprisingly resilient Nazis. Then, the ghouls persist even after the vampire is killed.
 * A major issue in Tsubasa Reservoir Chronicle. We don't find out until the very last chapter, but.
 * In Fullmetal Alchemist, whenever a limb or other body part of a homonculus is separated from the rest of the body (or, to be more specific, ), it decomposes into dust in seconds, only to be replaced as the homonculus regenerates. Though, it is possible to reattatch it if it's done instantly, as shown when Gluttony keeps himself from falling apart, so to speak.
 * Subverted in Hunter X Hunter, where the local form of spiritual power, Nen, can be used to materialize objects or impose 'rules' to people which don't disappear with the death of the caster; instead, they can even get STRONGER. A specific ability (Nen removal) must be used to get rid of this kind of things.
 * Averted in One Piece's Arabasta arc. Even after having beaten Crocodile and his Baroque Works, the civil war in Aluburna rages on, Crocodile after all the only manipulated both sides to start it and wasn't directly involved.
 * But played straight shortly after, as immediately after he is defeated (he's still alive, but unconscious), it starts to rain again. Probably justified, as his sand powers are implied to have been holding the rain back, and now that he's been weakened, it returns.
 * At the end of Jack and the Witch (1967), after the evil queen Auriana is destroyed the magic she used to turn children into harpies dissipates, causing the kids to return to normal.
 * Madoka Magica: It seems that any active magical effect is destroyed when the Magical Girl causing it dies, most obvious with their outfits. The same thing happens to a witch's barrier when the witch is destroyed.
 * The Spin-Off Oriko Magica seems to avert this
 * The other Spin-Off, Kazumi Magica, also uses this trope in an interesting fashion. The title character is an Amnesiac Hero. When she doesn't get her memories back after  she realizes that her amnesia must have come from something else.
 * One of the best aversions in history shows up in Star Driver. Long story, but an Artificial Human was created using a First Phase power. When the Driver lost the power, it was assumed the creation disappeared. It turns out to be not the case.
 * In Pokémon Special, averted with Team Rocket's first schemes in Kanto. Said schemes involved using the Viridian Forest as breeding grounds to raise an army of powerful Pokemon to take over the region. Two years after Red beats Team Rocket, the Forest is still full of non-native, over-leveled Pokemon who are liable to attack people at random.
 * In Mawaru Penguindrum's episode 12,

Card Games

 * In Magic: The Gathering, this is averted with abilities; once they're activated, they exist (on the stack) independent of their source, meaning destroying the source does nothing to stop the ability. However, this is played straight in multiplayer games: When a player loses the game, all of his stuff ceases to exist in-game (see rule 800.4 for details).

Comics

 * Particularly aggravating when mutants (in the Marvel universe) lose their powers and (in general) turn human. That is, you might have looked like this as a mutant, but once you're cured, you get an instant human body. Almost as if you had never been a mutant in the first place.
 * As briefly touched upon above though, it's only a general rule. Chamber, a mutant whose explosion/fire/whatever powers blew off his lower face and chest, had to be put on a life support when his powers disappeared. It seems it doesn't count if it was an indirect effect of their powers, or if it will cause something even shitier to happen to the character.
 * Similarly, Wolverine had... issues... when he lost his healing factor while still possessed of his adamantium skeleton and claws. Not only is adamantium apparently poisonous and thus his own skeleton was slowly killing him, the skin between his knuckles no longer healed up when he unsheathed his claws.
 * X-Factor, in fact, did an arc based partially around that premise. SOME mutants became completely human looking when they became non-mutants, but other mutants retained vestiges of their mutations even after Decimation—horns, colourful feathers instead of hair, etc. -- and some of them resent ex-mutants who can pass as completely humans who retain their attachment to their previous mutant state, because they can go back and forth, whenever they want.
 * In what is probably the worst offender this editor has ever seen, Spider-Man character "The Lizard" was created by a man, Dr. Curt Connors, trying to grow his right arm back. When he becomes the Lizard, his right arm does, indeed, grow back. When he's cured and reverts to normal, however, he loses his arm again. Connors' RIGHT ARM has No Ontological Inertia. Ditto for Kommodo, who uses an improved version of Dr. Connors' formula, that allows her to transform at will. In human form, she has no legs. Where on earth do they come from?
 * The same place all of The Hulk's extra muscle comes from, the Meat Dimension.
 * Scarlet Witch and her twin sons. To wit: back during the Vision & The Scarlet Witch mini-series, Wanda used a big mass of chaos energy to do the otherwise impossible—make herself pregnant with the android Vision's children. (Why an android would have reproductive organs... let's move on). We find out later on that the twins aren't kids with impossible origins, but magic-powered figments of Wanda's imagination. When she wasn't thinking of them on some level, they literally faded from reality. They were "killed off" when minor baddie Master Pandemonium absorbed them into his demonic gestalt body. Recently, the twins were resurrected and aged-up as Wiccan and Speed of The Young Avengers (though their parentage has never been officially confirmed by canon or Word of God).
 * Used to horrifying effect in The League of Extraordinary Gentlemen volume II. During a dinner scene, Mr. Hyde's conversation slowly reveals that he has just
 * Averted in an interesting way in Judge Dredd. In the earliest years of the comic (those set in the 2100s) there has been a prophesied doom that would strike in 2120. Judges Dredd and Anderson used an experimental time machine to travel to the future where they find the cause, a psychic entity of huge power known as The Mutant, travel back in time and prevent it coming to pass. However the Zombie Dredd of the future that The Mutant had unleashed to torment Dredd had come back with them. It has become deanimated, but the fact remained that there was now a 13-year-older Judge Dredd corpse in the Black Museum.
 * Superman's Kryptonian physiology has often been described as a solar battery, absorbing the radiation from Earth's yellow sun and storing it, which powers his flight, invulnerability, and super-cake-baking powers. However, whenever someone wants to shut off Superman's powers, they just bung him in a room with a Red bulb and he becomes as weak as a kitten. The equivalent with a human would be going into a dark room and suddenly deforming with rickets because of massive Vitamin D deficiency.
 * As with anything Supes-related it varies continually, but one explanation bandied around is that red sunlight blocks up the cell mechanisms which use solar energy in a manner analogous to competitive inhibition of enzymes in cell biology. The stored energy is still there, but he can't use it until he's purged the red sunlight clogging up his cells. Still, it doesn't make sense—a light bulb eradiates way, way, way less light than a sun.
 * Even his reaction to red sunlight varies by writer. Sometimes his powers flip off like a switch when exposed, sometimes the light simply weakens him rapidly, and likewise he can recover slowly or quickly. Recently, the Kandorians made a Red Sun gun that fires a burst of red sunlight at a Kryptonian which shuts off their powers completely for an hour even though the exposure is brief.
 * During the Millennium crossover, the Justice League visited the homeworld of the Manhunters and confronted their leader. The entire planet collapsed when the head Manhunter escaped.
 * A major plot point in Lucifer where everything starts to go straight to hell (so to speak) when Justified in that
 * Briefly mentioned and sort of averted in the JLA special Foreign Bodies, in which the Justice League undergoes one big Body Swap. Green Lantern, stuck in Martian Manhunter's body, points out to Aquaman (in Wonder Woman's body) that at least he got his hand back—all of the characters' unique physical features stay with their bodies, not their minds, as it should be if you only switch minds. He calls it "proof of some kind of thermodynamic 'conservation of anatomy' principle."
 * This is how Green Lantern's powers work. The constructs and effects he creates only exist as long as he is thinking about them. However, any impact his constructs have on normal physical matter remains (if he digs a pit with a glowy shovel, the pit remains after the glowy shovel disappears.)

Films -- Animation

 * Disney's Aladdin
 * Genie moves the palace to higher elevation per Jafar's orders. When Jafar is defeated, the palace instantly and magically moves back to its original position. The fact that defeating Jafar reversed Genie's actions makes this case particularly absurd.
 * Justified in that the Genie was likely undoing not only the damage caused by Jafar, but that he did while under Jafar's control.
 * The changes Jafar made using his power as a sorcerer were undone when he became a genie. The rug (which had been unraveled) was re-woven, Abu changed from a mechanical monkey back into a real one, and so on.
 * In the Lion King, Scar's death immediately brings rain back to the Pridelands and repairs a completely devestated ecosystem in what appears to be a few months.
 * Near the climax of the Disney version of The Hunchback of Notre Dame, Quasimodo pours ridiculous amounts of molten copper from a cauldron onto the soldiers in the sqare below. A little later, Then, when the protagonists come out of the cathedral at the end of the movie, the boiling metal is gone and the square is full of people.
 * In Disney's Tangled, we have Mother Gothel, who has been using Rapunzel's magic hair to stay young forever. While she does occasionally have to replenish this magic, when.

Films -- Live Action

 * In Magma: Volcanic Disaster, once the hero removes the underlying problem causing the eruptions (by setting off more eruptions underwater with nuclear weapons, despite nuclear weapon testing being the cause of the problem), all the volcanoes stop erupting, the lava recedes, and all fires are put out.
 * The virus pandemic in Outbreak. Once the protagonist has found and isolated the antibody from the monkey's blood serum, by the next scene there's enough antiserum for all infected (how?). Once injected into the dying people, it instantly cures them and everything shortly thereafter has returned to normal, with no lasting ill effects. This was a flesh-eating virus. So, once the antidote is delivered, all damage is instantly healed; including skin lesions and internal organ damage.
 * A major plot point in Underworld Evolution, As the first vampire, Markus managed to convince the other vampires that killing him would destroy all of them, and killing his brother William (the first lycan) would destroy all lycans—thus depriving them of their slaves. When Selene hears about this a thousand years or so later, she immediately sees it for the lie it is, but the one telling it to her notes that Victor believed it enough to not risk it.
 * A rare biological "science" form of this trope occurs in Van Helsing. When he removes Mr Hyde's arm, it shrivels back to the arm of Doctor Jekyll as soon as it hits the ground. In the same film,
 * The League of Gentlemen's Apocalypse is a meta-example of this trope. The League of Gentlemen characters invade the real world when their world starts to collapse as their creators have moved on to a new project.
 * In Dario Argento's Inferno, the central apartment building collapses after its designer is strangled. (In Suspiria, the building bursts into flame after Helena Markos is stabbed, but that's more of a Load-Bearing Boss.) is, like  a Load-Bearing Boss. In both cases, the house is an extension of the  who lives there. The same happened to ,hence there is an in-universe logic to it.
 * In Super Mario Bros, as soon as Koopa is defeated the King turns back into a humanoid without needing to be re-evolved.
 * Star Wars: A New Hope, as a standalone, would have you believe that the Empire was utterly destroyed after the Death Star was. Return of the Jedi is even worse, as lampshaded in the second Robot Chicken special: "The Rebels are right there! Get them!" "We... can't." "Why not? We still have this fleet, and they're almost destroyed." "No, you see, we lost." "We what?" "Yes, afraid so. They blew up the Death Star and killed the Emperor. We lost."
 * Somewhat retconned in the books, in that the Empire became much weaker after Endor, but held out for a couple years, and even afterwards held on to an "Imperial Remnant" for years.
 * Hand-waved in the EU by Timothy Zahn with the invention of what became, in the games, Battle Meditation. The Emperor made the Imperial forces awesomer because of the Force. When he died, that awesomeness went away and, in the confusion that followed, the Rebels kicked major buttocks.
 * May be justified even without the hand wave. Many times in history a superior force has been totally routed by an inferior force after a suitably spectacular event saps their morale. With the dramatic destruction of the Death Star, the Executor, and the Emperor the fleet admirals may well have ordered a general retreat in order to prevent any more dramatic losses and re-assess their position. At that point Chronic Backstabbing Disorder kicked in and the rest is the EU.
 * The climax of 1995's The Net would seem to indicate that since an evil computer program that has erased all of Sandra Bullock's identity records, deleting that program will automagically restore all her records. (This is comparable to deleting your copy of Open Office to restore all your documents to their original condition, or un-Photoshopping your pictures by removing Photoshop.)
 * Sadly, this is probably not the silliest computer-related error in that movie.
 * In The Lord of the Rings: The Two Towers, once Saruman's magic hold on King Theoden is released, the King is instantly rejuvenated from his withered form. This not only includes his hair and beard spontaneously changing color, but actually growing shorter again.
 * A Wizard Did It. Literally. The magic doesn't just end, Gandalf actively throws Saruman out, so one can assume he did some fixing in the process (or even completely negated the magic, as this is also when he reveals publicly that
 * Lampshaded/brought up as a plot-point in The Lost Boys. The head vampire is killed, but Michael specifically points out that he doesn't feel any different and that nothing has changed.
 * Vampirism works this way in Suck—killing a vampire turns everyone he sired and everyone they sired back into humans.
 * Disney's Bedknobs and Broomsticks. When Miss Price loses her concentration after an explosion, all of the animated suits of armor and uniforms collapse to the ground.
 * Fright Night. The vampire Jerry Dandridge bites Evil Ed and Amy and changes them into vampires. When Dandridge is destroyed, Amy returns to normal, but Evil Ed doesn't.
 * In The Avengers,  the alien invading army immediately shut down and were defeated since they were evidently controlled by the base.
 * In Flash Gordon, the moon was only one second away from crashing into the Earth when Ming was killed, instantly restoring everything to normal. Ontological inertia wasn't even necessary at this point - normal physical inertia, or even the Earth's gravity, should have allowed the moon to keep moving for at least one second. Not to mention that Ming was using a machine to move the moon, so even without ontological inertia someone must have turned it off before Ming even hit the ground.

Gamebooks

 * Averted in Lone Wolf. After the Darklords are defeated, the lands that they corrupted in their campaign of conquest are still corrupted. The intro pages of the Grandmaster series reveal that the Elder Magi and the Herbwardens are working to restore the Darklands to their original states, but realize that it will take centuries of effort to undo the damage.
 * But played straight in . In the case of . In the case of.

Literature

 * In The Hunger Games a character is near death with blood poisoning, most likely dehydrated, they haven't properly eaten in perhaps a week, and yet, after a shot of a very potent medicine of sorts, they're pretty much fine. That, and apparently it healed a several inch deep gash in this person's leg in a matter of days after this.
 * Then again, the Capitol's technology does include force fields, hovercraft, genetic-hybrid weapon-creatures, and the means to film all the competitors in the titular Games without on-site camera crews...
 * Terry Pratchett's Discworld novel Hogfather features such a Collapsing Lair: The Castle of Bones, located in the otherworldly realm of the anthropomorphic personification and winter god called the Hogfather, starts to disintegrate back into ice and snow from which is was created after the Hogfather . In a weird subversion, the Hogfather seems to have negative ontological inertia;
 * This can be somewhat explained by the plan consisting of preventing belief in the Hogfather by means of magicly not letting people believe in him, but it used bits of people as they were earlier. For example, making a 30 year old not have believed in him since 8 years old.
 * In JRR Tolkien's The Lord of the Rings, the destruction of Sauron's Soul Jar (the One Ring) kills him, and with him gone everything he made with his power is undone, notably his fortress.
 * It's stated that Sauron was using his power to build his empire and even drive his forces. Also notable, and justified because the Nine rings were innately tied to the One Ring, is the instant destruction of the Nazgul.
 * Even the three rings of the Elves lost their power. Though Sauron never touched them and had no hand in their creation the Ring-Smiths learned their craft from his hand. Presumably any surviving Dwarf Rings were also rendered inert.
 * Spells (at least, some of them) in the Harry Potter universe apparently lack Ontological Inertia. For example, Harry realizes that is dead when the paralysis that character had cast on Harry releases. That same spell has several times been used to zap someone and walk off, so there's no reason but Ontological Inertia that this would work. It is also stated that a piece of soul trapped inside a Horcrux disappears when the Horcrux is destroyed (handwaved as a Horcrux is, apparently, the exact opposite of a human being; thus the Ontological Inertia depends on what contains the soul). Transfiguration also works this way; transfigured objects only stay that way temporarily, and they go back as soon as the wizard stops keeping them transfigured via magic.
 * Deryni magic works this way. Not only is it physically tiring to perform (exhausting when performed excessively), but effects vanish when their creator is destroyed. In The Quest for Saint Camber,  dies after   pushes him down a flight of stairs, and the handfire he'd created to light their way flickers and vanishes.
 * Commonly in stories involving vampires, werewolves or other "infectious" monsters; killing the "head vampire" (or what have you) also cures or kills any subservient creatures that one had created. Great way to have all of the main cast turned into these creatures and then have them back to normal in time for next week. Then again, magic may work that way for the purposes of plot.

This goes all the way back to Dracula, making it Older Than Radio. However, in the case of old Drac, the victim only got cured because the transformation wasn't complete yet. This has also been seen in the film Fright Night and the "Vampire Odyssey" series by Scott Ciencin; the vampiric transformation can be undone but only under very strict conditions (the creator vampire must be killed before dawn the same night, or the fledgling vampire must go without feeding for three whole nights).
 * In Anne Rice's "main" saga (Lestat the Vampire and The Queen of the Damned, mostly), one of the first vampires (who was also a witch/spirit seer/whatever) states that killing the first vampire would in turn kill all vampires. The king, who is the first vampire misunderstood it as "killing any vampire will kill'em all", so he let her go. This lack of ontological inertia is explained as vampirism actually being   They manage to kill  anyways, by.
 * Subverted in Rainbow Mars by Larry Niven. In one of the short stories in that book, the entire future in which the book takes place has its past altered so that it never came about. This is caused by the ghost of the time traveler who changed it that way in the first place. Long story. However, Svetz returns to the future and finds it the same as always, due to the effects of "Temporal Inertia". There's still a new future, but his exists purely out of the fact that it did. Of course, this is in a book where time traveling back before the 20th century takes you to a fantasy world with unicorns, Moby Dick, leviathans and Edgar Rice Burroughs' Mars.
 * In some of the other Svetz stories it's more or less explicitly stated that Svetz' "time machine" slews across parallel universes so that he winds up in the past of a parallel universe which may or may not closely resemble his own universe's past. The reason that he can return to his own universe is that only PART of the time machine (the "extension cage") actually goes anywhere/when; the other part remains in what Svetz thinks of as "the present" and serves as an anchor. It's confusing, but time travel stories often are.
 * This is invoked in Jonathan Strange and Mr. Norrell. Since magic is the effect of a magician imposing their will on the universe, the surest way to cure a person of an enchantment is to kill the enchanter.
 * Averted, and explicitly referenced in the Ciaphas Cain book Cain's Last Stand, at the end
 * Subverted in Larry Niven's What Good Is a Glass Dagger. The castles of the magician all collapse when he no longer keeps them functioning because he built them
 * Used straight and made part of the plot in Tad Williams' Memory, Sorrow and Thorn series, in the eponymous swords. The key to their power is that each sword was created in a manner that violates the natural laws of the world: Thorn is Thunderbolt Iron; Memory (Minneyar) was made from the keel of a ship from a far-off land (allegorical Thunderbolt Iron, if you will); and Sorrow (Jingizu) is a mixture of iron and witchwood, two substances that are naturally antagonistic. In the end, the swords, drained of their power, disintegrate into nothingness.
 * In fact, the Art is explicitly stated to work this way in general within the books; a rule of thumb measure of a character's magical power is how far they can bend the Laws, how long it takes to accomplish, and how long it lasts.
 * In CS Lewis's The Silver Chair, after our heroes kill the witch, the cavernous kingdom begins to collapse. Puddleglum reasons this is the result of a spell the witch cast so that whoever killed her would die shortly after. Also, the gnomes are freed from their Mind Control.
 * In Patricia C. Wrede's Talking To Dragons, after the evil firewitch is killed, Daystar looks at Shiara, turned to stone. He thinks that some spells die when the caster does, but some powerful casters can do better. This one was powerful.
 * Averted in Lloyd Alexander's The Black Cauldron; destroying the Cauldron does not destroy all the Cauldron-born zombies. But at least it ensures no one will make any more of them. Played straight in the movie.
 * On the other hand, The High King shows that.
 * An interesting variation of this trope is used in Alan Dean Foster's Humanx Commonwealth series as the power source of a superweapon, called "Fixed Cosmic Inertia". Basically, the device is placed in a stasis field that means that, no matter what happens to it, the major part of it continues to exist at the moment in space and time that it was originally built. When the weapon is triggered, the "rubber band" effect snaps the weapon to the present, translating all the accumulated energy into a single point in spacetime. The results are quite spectacular.
 * In The Old Kingdom series, there's an example of lack of ontological inertia that actually works against the good guys. Because the Abhorsen has sort-of died, the wardings he put on the Wall to stop the Dead are weakened and about to break.
 * An example with an explanation other that just magic; in Dean Koontz's Frankenstein,
 * Terry Brooks used it twice. Once in Sword of Shannara, where destroying the Warlock Lord not only collapses Skull Mountain, but also destroys his Skull Bearers, he being the source of the magic keeping them alive. Then in Wishsong of Shannara, the destruction of the Illdatch, also destroys the Mord Wraiths in the same manner, though it's more of a Keystone Army moment.
 * The fairy tale "The Bronze Ring", found in Andrew Lang's The Blue Fairy Book, features a classical genie ring. Ontological inertia is intentionally canceled when the black sorcerer gets hold of the ring; his first command is "make waste of all that you've done." This is a common stratagem in fairy tales where wishing rings are involved, and may be one of the reasons usage limits were hardwired into later models.
 * Justified in the second book of the Chanters of Tremaris Trilogy, The Waterless Sea when, as it is explained that the continuous iron-call chant was the only thing holding it together by that point, and stopping the chanters meant that the entire structure had about as much support as a gigantic sand castle.
 * In The Brothers Grimm fairy tale "Snowdrop", all of Snowdrop's stepmother's attempts to kill her work this way. She laces Snowdrop's dress up tightly and leaves her for dead, but the dwarfs unlace it and Snowdrop is fine again. She gives Snowdrop a poisoned comb, but the dwarfs take it out of Snowdrop's hair and again she's fine. Even the famous poisoned apple is like this: it lodges in Snowdrop's throat, and when the prince dislodges it she wakes up.
 * Played with in a short story by Neil Gaiman. The story itself is framed as being told in a club for famous con-men, by one of the best-who proves this claim by relating the tale of how he got into the club by selling a bridge (which the other members deride as so base and guileless that having ever tried such a scheme ought to disqualify you from getting in at all). In the particular corner of the cosmos the tale occurs in, magic was used regularly and the conman referred to Ontological Inertia as a "magical half-life", defined as the length of time after a magician's death that a magical working would stand, to convince several very rich people that an extremely valuable bridge constructed by magic was nearing the end of its half-life and that, by paying him a nominal fee of a few thousand, they themselves could profit greatly when it came down.
 * Edgar Allan Poe's "Fall of the House of Usher" describes in great detail how a mansion decays and collapses before the protagonist's eyes after its residents die.
 * Robert Jordan's The Wheel of Time describes a One-Hit Kill called balefire that not only instakills the target but undoes their actions for a period of time before their death, depending on the raw magical strength of the caster. It's used tactically at several points and even brings people back from the grave.
 * David Eddings's Elenium trilogy partially averts this trope; the world goes on being generally depressing even after the Big Bad is defeated, and it pretty much takes an Act of God(dess) to avoid a Downer Ending.
 * This is actually explained in-universe. The gods themselves are struck with fear and anxiety, and their reactions affect the mortal realm with gloom. Things only start getting better when they're dragged out of their collective funk by the enactor of the aforementioned Act of God(dess).
 * In a more direct way, this is played straight. After Azash is annihilated, the city of Zemoch begins to collapse under its own accumulated age.
 * Averted in James Herbert's The Fog; while the destruction of the fog results in clear blue skies and sunshine, those who succumbed to its effects are still insane. John Holman, the protagonist, even lampshades this.
 * In Robert E. Howard's Conan the Barbarian story "Shadows in Zamboula", the death of the Evil Sorcerer causes the cobras he conjured to vanish.
 * In the Kull story "The Shadow Kingdom", killing the Master of Illusion causes them to reappear as half-human, half-snake.
 * Edgar Rice Burroughs Barsoom novel Llana of Gathol, section "The Ancient Dead". When Lum Tar O is killed by John Carter, all of the people he put into hypnotic suspended animation a million years ago wake up at the same time.
 * In The Dresden Files, things from the NeverNever, be they objects or creatures, will evaporate into ectoplasm if the will keeping them intact flags. This can be a big help in maintaining the Masquerade.
 * In the short story "The Most Precious of Treasures" by Desmond Warzel, the protagonists note that a magical construct has in fact outlasted its creator by several millennia; this trope is not only discussed but mentioned by name.
 * In Replica #16, Happy Birthday, Dear Amy, implanted technology causes Amy to age into an adult overnight on her thirteenth birthday, but she somehow turns back into a teenager when the cause of the age-up is destroyed.
 * In Replica #16, Happy Birthday, Dear Amy, implanted technology causes Amy to age into an adult overnight on her thirteenth birthday, but she somehow turns back into a teenager when the cause of the age-up is destroyed.

Live Action TV
"Angelus: Aw, crap! You mean killing the Beast really does bring back the sun? I thought that was Angel's retarded fantasy."
 * Extremely common in kids' shows, but perhaps best exemplified by Power Rangers. In such series, the destruction of a monster almost always reverses whatever effect his power has wrought on the community. In Power Rangers, even objects stolen by the villains will also be returned when the Monster of the Week is slain—when it wasn't even that monster that took them. The most ridiculous example of this is in one episode of Dino Thunder where the ocean-controlling monster has used his powers to summon a tsunami out of the depths, which is about to hit the city. The Rangers destroy the monster just as the wave is about to hit, and the tsunami fades away into nothingness.
 * Super Sentai does this as well.
 * Kamen Rider Den-O has an interesting dual case of this. Similar to the other kids show example above, when monsters go back in time to wreak havoc and the title character defeats them, any changes they've made to the timeline are reversed... almost. Human beings have No Ontological Inertia, since their existence is dependent on memories others have of them. So if someone is killed in the past, but everyone that knew them in the present loses their memories of them at the same time, that person won't come back to life, and will be forced to wander the timestream. This leads to a very glaring plot hole later in the series. Ryotaro isn't worried when because by killing the Monster of the Week, all the damage is restored. Unfortunately,  All well and good, until it gets revealed that
 * Lampshaded in Angel Season Four, when the evil Angelus kills the Beast, then complains when the Beast's blotting out of the sun is immediately reversed (as Angel had imagined in a dream-sequence episode).

"Doctor: I'm the Doctor, and I cured them!"
 * In Buffy the Vampire Slayer:
 * Averted in "The Pack" (Season 1), though the applicability of the trope is arguable. Xander pretends that he doesn't remember any of his actions after the  spirt leaves him (but he really does remember). If memories are erased, that can be this trope. If the possessee was never conscious of the events in the first place, then it's not this trope.
 * In "Prophecy Girl" (season 1 finale), the Hellmouth re-closes for no particular reason when the Master dies.
 * Played straight in "The Dark Age" (season 2). The demon Eyghon possesses, whose appearance gradually becomes demonic. When Eyghon is expelled, she immediately reverts.
 * Averted in "Bewitched, Bothered and Bewildered" (season 2). Xander misuses a love spell; even after it's undone, the memory of it widens the growing rift between him and Willow (who had unresolved feelings for him already).
 * Played straight in "The Wish" (season 3). When Giles (in a dystopian alternate timeline) smashes Anyanka's amulet, history is restored. It makes some sense, given that the spell was itself retroactive, but events early in season 7 may still lead one to question the logic.
 * Very explicitly played straight in "The Replacement" (season 5): Xander has been split into two halves by a demon's spell, and Willow explains that there's not much to rejoining them—their natural state is to be together and the spell is doing the work of keeping them apart, so all she has to do is end it.
 * Played very straight in "Same Time, Same Place" (season 7): to save Dawn from paralytic poison, the team must kill the demon that poisoned her. She recovers abruptly and funnily.
 * Charmed was very bad, and inconsistent about this.
 * House is a regular offender. However, depending on the dramatic level of the episode, they might avert this.
 * Heroes:
 * Adam Monroe (spoilers ahead).
 * In the Season 3 finale, Sylar activates Primatech's security system, causing heavy bars to drop over the windows and all the lights to go out. When, the heavy barriers all rise and the lights turn back on..
 * The succubi in Krod Mandoon and the Flaming Sword of Fire reproduce by forcing an egg down a man's throat, which then swells in size inside their stomach to give them the "ninth month of pregnancy" look and apparently bursts out from their belly like in Alien. That is, unless you slay the succubus that laid it, causing an immediate "miscarriage" and the victim vomiting up the remains. This could just be an effect of the Flaming Sword of Fire, as we don't see a succubus being slain with anything else, but it still doesn't make sense either way.
 * Supernatural:
 * The changelings all asploded when the mother was killed.
 * In the episode "Heart," whether or not werewolves are subject to ontological inertia is actually a central plot point..
 * Averted in Big Wolf on Campus when a medusa turns Merton to stone. The medusa is defeated, but Merton can't be changed back without Tommy and Lori going through an arduous process to obtain a special potion. Also, defeating the evil librarian (don't ask) doesn't save the people trapped in her books..
 * Averted in The Sarah Jane Adventures' "Eye of the Gorgon". Defeating the Gorgon doesn't turn the people it's petrified back. You need to use the talisman, and it only works if they haven't been stone too long.
 * Doctor Who:
 * Played straight in "The Daleks." The Thals' anti-radiation drugs seem to restore the Doctor and company, who were nearly close to death from radiation poisoning, almost instantly.
 * Played straight in the serial "Terror of the Autons," the Master's somewhat inauspicious debut. He awakens a dormant meteorite containing the Nestene Consciousness, which animates a group of Autons (plastic automata) he created, which go on to create second-generation Autons that also come alive with the Nestene Consciousness. When the Autons take care of the first phase of the invasion, the Master uses a radio telescope to broadcast some kind of energy that allows a Nestene mothership to instantly materialize in Earth's sky. When the Doctor reverses the polarity of the telescope, not only does the mothership disappear, but every Auton falls lifelessly to the ground.
 * Justified, in that the Autons are not independently intelligent, but are directly controlled by the Nestene Consciousness.
 * Also played straight in an early episode of Tennant's run. The Doctor uses a vaccine to cure a zombie apocalypse, complete with their rotting flesh re-forming before our eyes.


 * Another Doctor Who example in the new series' episode "Vampires in Venice"; when Eleven turns off the generator that begun to give Venice its own natural-disaster apocalypse, including a tidal wave started by an earthquake, within less than a second the sky clears up, the clouds move, and everything is sunshine and rainbows.
 * The episode "The Curse of the Black Spot" features a Monster of the Week that enters our world using reflective surfaces as a gateway. At one point she does this via a crown; the Doctor responds by tossing said crown into the sea. This somehow causes the monster to vanish. The "monster" was actually a projection from a ship on the other side. Throwing the crown in the water severed the connection.
 * In the 1998 Merlin series, Queen Mab's spells begin to lose their power and fade away after she disappears. It seems to take at least a few years, though.
 * Used inconsistently in Warehouse 13—as soon as artifacts get neutralized, all their effects generally go away and people return to normal. There are numerous exceptions, though.
 * Averted in Kamen Rider Double's portion of the Crossover Movie Wars CORE: the Spider Dopant has the ability to plant "spider bombs" in people that go off if they get too close to their loved ones. The bombs are still active after his defeat, which forced Double's mentor to avoid his own daughter for the last decade.
 * In Assignment 3 of Sapphire and Steel, the Changeling can reduce things to dust by touching them. When Steel returns him to his original condition, everything he had touched is instantly restored.

Tabletop Games

 * Occasionally found in the Ravenloft setting for Dungeons & Dragons. When the Darklord of an "island" domain is killed, the island may cease to exist, sometimes simply being absorbed into the Mists, sometimes violently falling apart. What happens to the island's inhabitants is unknown. This is because the Darklords are Fisher Kings of their various domains, which only exist to serve as a prison and stage for the Darklords they're built around. With no Darklord, the domain literally serves no purpose and is, in the view of the Dark Powers, expendable.
 * This trope forms an important part of the worldview of the Abber Nomads who inhabit the Nightmare Lands domain. Because their surroundings are constantly shifting, they see no reason to believe that anything exists when they are not interacting with it.
 * The default behaviour of magic in Mage: The Awakening. Generally, if a mage is killed, their ongoing spells will end, since they require the mage's soul to function. However, mages have the option of relinquishing a spell, making it self-sustaining, at the cost of no longer being in control of it, and having to invest a dot of Willpower. Relinquishing a spell imbued into an item has a few other options for what has to be sacrificed.
 * Vampire: The Masquerade
 * Level 10 of the discipline Quietus is Punish the Sins of the Father, which kills the target vampire and all descended from him through the Embrace.
 * In one adventure a vampire was trying to kill the vampire who Embraced her so that she could become human again.
 * In Warhammer Fantasy Battle, the normal rank-and-file undead (zombies, skeleton etc.) in the armies of the Vampire Counts slowly crumbles to dust when the general of the army is killed, since the magic power that have created them is gone. In case of creatures such as ghouls who are not technically undead but enslaved by the vampires will, they slink back to where they come from. This was partially averted on a grand scale when the spell Nagash was casting to resurrect the entire world's dead was disrupted. Most of the died again, but many stayed around and there are still places where the dead spontaneously come back due to the echoes of his spell.
 * Averted with certain spells that have a delayed response. As one faq pointed out, jumping up and down on a wizard does not stop a meteorite he 'summoned' from crashing onto the battlefield a turn later.
 * Champions supplement The Circle and M.E.T.E.. When a vampire is destroyed, some of the people it changed into vampires become human again.
 * Massively averted by the Nobilis, who exist in Celestial time and are mostly immune to the effects of mundane time. You can travel to before a Noble was born and kill her parents...and all you'll do is piss her off. Mundane history now says she was never born, sure, but she still exists, because she she was Ennobled before you tried to erase her.
 * Incorporated into Ars Magica, where less powerful magics often have no persistence, but more powerful magic does persist, mainly through investment of game resource / power-points. Things destroyed by magic stay destroyed, and killed creatures are still dead, even with less powerful magic.

Toys

 * Bionicle's Kanohi Mohtrek toyed with the trope. It's essentially a mask that creates duplicates of the user, but with a twist: the duplicates are actually the user's past selves, plucked out of the timeline into the present. Then they fight or some stuff. When the mask is turned off, the duplicates return to their original time, and will have no recollection of the future events they "just" witnessed. What the mask doesn't undo is physical damage, however. So whenever a past-self is summoned into battle and gets battered and weakened, he/she will return in that state to his/her timeline, but won't know how he/she suddenly got weakened and bruised.

Video Games

 * Might and Magic VIII: Day of the Destroyer has this, complete with sunshine, rainbow and birds flying.
 * On the other hand, it appears that the consequences of the opening of the portals to the Elemental Planes remains even after the portals are destroyed—the ending only gives short glimpses, but the island on which the Earth Portal is situated doesn't appear to sink after the portal is destroyed, nor does the lake in which the Water Portal is situated drain away as soon as the portal is destroyed. The post-ending gameplay would seem to corroborate that, except the elemental portals remain open despite the ending explicitly showing all of them being destroyed.
 * A rather ridiculous example of this is mentioned in Shang Tsung's Mortal Kombat Armageddon bio: Supposedly, his master, Shao Kahn, has a contractual stipulation with anyone who pledges allegiance to him that, if Shao Kahn ends up biting the dust, so too will they, which also means he's able to revive his minions should they die due to this link. In a minor subversion, however, it's apparently treated as an unsubstantiated rumor among Khan's allies, hence why Shang Tsung had no compunction about slaying him with fellow sorcerer Quan Chi's help at the beginning of Mortal Kombat Deadly Alliance. A minor point of argument with this among fans is exactly who will be affected by this trope should Shao Kahn be Killed Off for Real.
 * Mortal Kombat 3:, as defeating Shao Kahn revives all the people who died in the game's opening apocalypse (presumably having their souls taken only rendered them mostly dead). This wasn't the case in the very first edition of Mortal Kombat 3, which suggested that most of humanity remained dead even after the game ended, but that changed in all the subsequent editions, presumably to make further Earth vs. Outworld sequels easier to write.
 * Occurs in the end of Kingdom Hearts.
 * The world of Drakengard has No Ontological Inertia. You ready for this one? In the sequel, the change is even more violent, as the sky literally shatters. This leads to a bit of Fridge Logic when one wonders how those seals came to be in the first place.
 * Dragons did it. Then humanity emerged and kind of mucked it all up.
 * In Makai Kingdom, anything that has been created by being written down in the wish-granting Sacred Tome will suffer the same fate as the page it was written on should the tome be damaged. Spilling coffee on the book is probably not a good idea—burning it is even less so.
 * In some video games, projectiles cease to exist if the enemy that fired them is destroyed. In some other ones (such as Shoot Em Ups), the projectiles turn into "happy things" that are attracted to the player to give points. But don't count on either behaviour.
 * At one point in the console RPG Chrono Trigger, the player is given the choice to fight and kill Magus, the villain for the first half of the game, or to spare his life since certain other characters have far surpassed him on the Villain Meter. If you choose to kill Magus, his curse on Glenn/Frog is lifted at the end of the game, whereas if you let Magus live, Glenn is still a frog at the end. This raises questions, because
 * The PlayStation version adds to the confusion with an additional ending cutscene which features a human Glenn, which plays whether or not you killed Magus.
 * The Nintendo DS version adds one more ending that may avert the issue of Magus dying of old age in 12000BC:
 * Except that's not what happened.
 * Chrono Trigger also averts this trope when the heroes attack Magus's palace, . The disappearance of their ruler doesn't end the Mystics' war against the Kingdom of Guardia as his second-in-command picks up where Magus left off.
 * The big statue of Magus in the Monster Town is replaced by a statue of his general. Once you kill HIM, then the statue goes away and all of the Mystics in the present become friendly to humans.
 * Chrono Trigger also has an interesting version of this trope after the Ocean Palace, where even if, the damage done by the party causes
 * Averted in Blood Rayne 2, where killing the Big Bad at the end of the game doesn't actually change anything; the world remains the same vampire-ruled hellhole the Big Bad turned it into halfway through the game. The protagonist even remarks how thinking everything would change back to normal after the Big Bad's death was "pretty stupid, huh?"
 * Mega Man Battle Network is all over this trope. In any battle, as soon as you kill the last enemy, you're invincible; all onscreen attacks will either disappear or pass right through you. This is true even in Network Transmission, a sidescrolling homage to the classic series. Examples abound in the plot of the games too: when you beat an enemy NetNavi, whatever havoc it's created in the real world is harmlessly defused.
 * Averted by the bosses of the first Mega Man, where boss attacks did in fact survive their user's destruction and could do damage to Mega Man. Made worse by the fact that you couldn't move for a split second after defeating the boss, meaning if the timing was just right (or wrong, as the case may be), you were a sitting duck for a stray shot or one of Fire Man's ground plumes. Especially problematic against Elec Man or Ice Man, whose projectiles could take off roughly a third of your health.
 * In Metroid Prime 3: Corruption, the final boss is a load bearer of galactic proportions—upon defeat, not only is the boss's planet destroyed, but so is all Phazon throughout the entire galaxy, instantaneously, and in suitably explodey fashion.
 * In the MMORPG City of Heroes, killing a character with summoned pets kills the pets as well. This arguably makes sense when the pets are animated stone or illusionary phantoms, but in the case of the "Mastermind" player class, this extends to autonomous robots and ordinary street thugs. Note, however, that ordinary mooks brought onto the field by such an act do have ontological inertia. However, this is subverted by a lot of NPCs that summon particularly annoying pets that are more difficult to defeat than their summoners.
 * The same effect applies to hunters and warlocks in World of Warcraft. Whether it happens with NPCs tend to vary on whether they are normal units (where they almost never disappear) or bosses, when they frequently do.
 * Played straight with the shaman class and their totems (elemental talismans dropped on the ground that buff players or debuff/damage enemies). When the shaman dies, the totems vanish.
 * Subverted in the Wrath of the Lich King. The initial invasion is planned to defeat the Lich King and then wipe up the remaining Scourge after his fall. It is subsequently revealed that.
 * ...Which completely contradicts how the Forsaken were able to emerge in the first place. The Lich King was weakening, and because of that, many of the Scourge were able to regain free will, including Sylvanas, who started the Forsaken.
 * It's a slightly odd moment in Sonic Adventure 2 (amongst other games) when you realise that destroying an enemy causes all of its projectiles that are coming towards you to mysteriously disappear.
 * Not to mention that after Eggman it got better in the later games after  was put out of commission. It's especially jarring in Sonic Advance, where.
 * According to Word of God, Eggman.
 * In Mushroom Hill Act 2 of Sonic 3 and Knuckles, the green grass on the ground turns into brown leaves and the sky turns a strange color at the start of the level. The effect gets worse as you progress though the level. At the end of the level you find a satellite dish broadcasting some type of signal. Destroying the dish will instantly revert the ground back from brown leaves to green grass and make the sky (and the rest of the stuff in the level) turn turn back to it's correct color.
 * Averted in Disgaea 2: Cursed Memories: According to the art book, even with the death of, Veldime will in fact remain a netherworld. The people will remain Demons, the monsters that were attracted to the world under Xenon's influence will not leave, And while the landscape's transformation has been halted, what had already been changed will remain so. The book does go on to say however, that since Xenon is no longer , they will at least stop turning evil, and points out that many changes brought to Veldime as a Netherworld were in fact positive, so things still work out in the end.
 * Takes on another form in online games that utilize "lag compensation," notably first-person shooters. Suppose two combatants fire upon each other, one with a plasma gun, another with a rocket launcher. From each player's perspective, the other hasn't yet fired; meanwhile, on the server, the rounds pass each other by mid-flight. The plasma bolts, having faster velocity, hit their target first for lethal damage. Should the rocket launch and plasma death occur within the lag compensation window (usually around 1/10th of a second), the rocket "was never fired," and the plasma gunner gets an easy kill. Outside the window, the plasma gunner still has to dodge the rocket. This phenomenon also causes hastily-flung grenades to disappear, and assault rifle victims to apparently die from one or two bullets. On a related theme, some weapons "charge up" by holding fire, and launch when their button is released. Killing players during the charge up sequence causes the super-attack to instantly dissipate rather than either launching at that instant (or wildly).
 * In Digimon World, it is possible for a fireball, stormcloud, or various other projectiles to vanish in midair because the user's technique was interrupted.
 * In Final Fantasy IV, killing a summoned creature kills the summoner as well. Played for a My God, What Have I Done? moment in the village of Mist, when Cecil and Kain discover to their horror that not only did the King of Baron's package just nuke the town, but they personally murdered Rydia's mother by killing her summoned dragon in the Mist Cave. There is also another important plot moment with the Dark Elf who stole Troia's Earth Crystal—he cast a spell on the cavern he hid in, magnetizing the entire cavern so strongly that equipping even a hint of something metallic will completely paralyze the character in-battle, making it impossible to defeat him. But when breaks the Dark Elf's concentration, the aforementioned magnetism immediately vanishes and the party can defeat him for real.
 * Played very straight in Final Fantasy VI, with good reason.
 * Less because of Kefka than of the Warring Triad.
 * Teased with in Final Fantasy XII.
 * Vampire: The Masquerade Bloodlines mocks the "head vampire" variant, as that's really not how the game it's based on works. You can find a neonate who's lamenting his undead condition and seeking a cure; you can either let him down easy or try to con some money out of him by saying it only works if you kill the head vampire with a stake of "holy rosewood" (which you just happen to have).
 * Referenced but Averted in the Legacy of Kain series. Ancient vampire Janos Audron mentions to Raziel that the Sarafan think killing him will be the end of the vampires but adds, "We are not that fragile."
 * Killing a Demoman in Team Fortress 2 will cause all the explosive traps he's laid to disappear. There's even an achievement for removing a certain amount of traps by killing the Demomen that made them.
 * Similarly, killing an Engineer during Sudden Death (and possibly Arena) will make all his buildings explode. Note that this does not happen in any other game mode, where the Engineer can then respawn and go back to his hopefully still standing buildings.
 * Also if an Engineer switches to another class, all their buildings will disappear. This is probably an Acceptable Break From Reality because otherwise someone could build a sentry, switch to a more deadly class, and still get sentry kills.
 * Engineers who switch wrenches will have their buildings destroyed, since each wrench provides a specific bonus tied to buildings (usually at different points in the building's life, such as one wrench making things build faster, while another one lets you teleport back to base, and a third one allowing you to build a quick-deploying combat mini-sentry instead of the regular sentry gun) and would be exploited for changing out wrenches before actually heading out with the buildings. However, if your client loses connection to the item server and you have a special wrench equipped, the game will automatically force you into the stock wrench and destroy your buildings, even though you never intended to change.
 * Averted with the Pyro class, whose fire will continue to burn away at enemies even after (s)he's killed.
 * At least partially justified in Heretic; D'Sparil was keeping his minions in your dimesnion with his power, so after his death they all die or get sent back. The beings of his home plane of existence, covered in the Expansion Pack, Shadow of the Serpent Riders, remain unaffected though.
 * Arcanum has a few quest-based curses that expire on death. One example is found early on, and the other involves the Crystal Ball quest. The Gypsy Blood curse, on the other hand, is caused by death.
 * This actually applies to a large majority of spells. Summoned monsters disappear when you no longer sustain the spell, time reverts to normal when you're no longer consciously altering it, et cetera. Actually, Arcanum makes considerable use of the ephemeral nature of magic both in its discussion of the setting's philosophies, sciences and cultures, and in its game mechanics. No Ontological Inertia is again used here with deliberate intent. Its few exceptions run the full gamut from excellent writing to dropping the ball.
 * The Zelda series has this in spades. A usual pattern is visiting a new area, finding something wrong with the local environment, slaying the boss monster inhabiting the nearest temple, and collecting your reward from the grateful townspeople when their lake is refilled, their mountain quits erupting, their well quits sending out shadows to stalk them at night ...
 * Though this trope is not used in the original King's Quest III, the two remakes by Infamous Adventures and AGD Interactive avert it and play it straight, respectively. In the first, an epilogue shows  rebuilding the kingdom of Daventry from the devastation wrought by the dragon, but in the second a magic glowing pinball rebuilds the kingdom and puts everything right once the dragon is dead.
 * Cabal has this in spades. To beat a level, you had to defeat enemies and destroy structures until a bar at the bottom filled up, at which every remaining enemy died/blew up and every remaining structure on screen collapsed. As for the two Flunky Bosses, destroying the main target would cause all the flunkies to spontaneously explode.
 * In Pokémon Black and White, when the event Zoroark is defeated/captured, the clearing it is in fills with flowers and much more pleasant-looking trees. Justified because the Zoroark had disguised the actual clearing as something different.
 * Averted in the Valley of Dying Things scenario of Blades Of Avernum. The Vale is suffering a curse in which the rivers poison the vegetation and anything that drinks from the river or eat food grown with river water. After destroying the source of the toxins,  the poison already within the environment does not leach away or vanish, and the inhabitants of the Vale flee only to come back once the Vale has been magically cleansed. Even then, the land is still not as prosperous as it was before the curse.
 * Subverted by the Fallout series. At the end of the first game, you . In all the subsequent games, however, the good guys (and others) are still fighting against bands of Super Mutants who survived.
 * Averted in Knights of the Old Republic I & II, where, if an enemy who wields the Force casts any lasting Force Power on you (or your party), such as "Plague," which slowly drains your health, his or her death will not stop the effect of the Force Power. It will run out eventually in the allotted time establish for that skill, unless you cast a Power of your own previously designed to counter it, but killing the NPC who inflicted it on you does nothing to help.
 * Averted in the Sci-fi 4X game Sword of the Stars. If you attack a planet and kill all the population, any planetary defenses will still be active and need to be destroyed before you can take over. Sometimes you can even kill just the "imperial" population, leaving (most of) the "civilian" population intact. (Basically killing anyone directly related to the faction who owns the planet, but leaving everyone else.) If nobody moves in to grab the planet after that, they will just declare independence and become a neutral party until someone muscles in on them again.
 * Played heartbreakingly straight in Final Fantasy X. After the Fayth are released from their state of constant dream summoning, everything they summoned starts to fade away such as the Aeons and.
 * Averted in Anvil of Dawn. While trying to get past the gargoyle in the basement of the Dark Lantern, you can point out that the mage who summoned him as a guardian is now dead. The gargoyle says he's pleased to hear that, but he's still bound by the summons, which you have to break yourself before you can get past him.
 * The stealth shooter Vampire Rain takes this trope Up to Eleven with the Nightwalkers being completely dependant on the vampire who sired them. This becomes a gameplay mechanic about halfway through the game, when killing certain vampires will destroy all the vampires sired by that particular vampire in the level..
 * Averted twice in the Parasite Eve series. The first is after the death of Eve. . The second is revealed in Parasite Eve 2. Eve's monstrous creations did not all drop dead after Eve   are destroyed and wreak havoc across the U.S for several years.
 * In Super Mario Bros. (and all spinoffs), any enemies in boss battles will immediately vanish once the boss is defeated. In Super Mario World this extends to sprites in general, if you're riding a Yoshi in a battle, the Yoshi vanishes once the boss is defeated as well.

Web Comics

 * The permanence of any spell run amok in The Wotch seems inversely proportional to the number of people still stuck when the danger has passed. For example, a demon turns dozens of people into human-animal hybrids, and even a stone fountain, but they all turn back when he vanishes. On the other hand, a girl turned temporarily into an imp switches a couple, and they stay switched for months after she turns back, and only switch back at all because a witch does it for them.
 * Averted in Bob and George; George is wearing a time travel suit that makes him intangible. When the suit is destroyed, he stays intangible. A lot of fans were surprised by this, given the prevalence of this trope.
 * Averted in Dominic Deegan with the poison infecting orcish lands. It takes so long to be undone after the source was destroyed that Dominic face palms himself for completely forgetting it was there.
 * In Sluggy Freelance, the demon K'Z'K possesses Gwynn's body and changes it to a large, monstrous form. He seems able to change alter this form at will and does so, and at one point even reconstructs it after being put through a meat grinder. And when he's banished from the body, which is looking monstrous at the time, it returns to its normal shape (albeit comatose because he keeps her soul). At least, before this, one of the characters mentions the possibility that she might come back as minced meat.
 * In Shadows of Enchantment, a common annoyance for the True Companions in the past has been for them to heroically slay a huge, hideous enchantment-created monster, only for its corpse to revert to a dead squirrel or something.
 * Summons in "El Goonish Shive" follow this rule. See ''Taurcanis Draco".
 * In Order of the Stick, three fiends discussing a magic-boosting 'soul-splice' mention that any spells cast during the splice with a duration will end when the splice does.

Western Animation

 * In an episode of Ben 10, a giant tick-like alien lands on Yellowstone Park and begins sucking all life in the area dry. The Tennysons are in the area, but are unable to stop it immediately due to the usual aliens proving ineffective. By the time Ben finally learns to use the new alien of the week, the entire area is gray and dead, the usual geysers are spitting poison, and the ground is brittle and breaking apart in large floating chunks. After the tick is destroyed, the background literally turns green and lush again in midconversation, and the gunk that Ben has to wash off the Rustbucket is the only evidence that the tick was ever there. Why then did the gunk remain?
 * DuckTales: Treasure of the Lost Lamp: when the genie is made a real boy and thus de-powered, Dijon (who had been transformed into a pig from a wish by the Big Bad) is restored to normal.
 * In another episode, a magical golden duck artifact with the power to turn things into gold has unleashed a magic wave that is turning the world into gold. Scrooge and the guy who accidently started the whole thing are rushing to return the artifact to the shrine fountain it came from. They eventually reach the shrine just ahead of the magic effect and throw the duck into the water even as they're turned to gold too... and then everything is returned to normal.
 * An episode of My Life as a Teenage Robot involved Jenny being turned into a rampaging monster by a tiny machine that had infected her. As soon as the machine was removed all the changes were undone in seconds right before the camera. The thing that makes this particularly egregious is the fact that Jenny is a robot.
 * The Gilligan's Planet episode "Too Many Gilligans" featured an alien cloning machine that began cranking out copies of the cast until the landscape was filled with them. When the machine was destroyed, all the clones vanished.
 * The Adventures of Jimmy Neutron once had an episode where Jimmy used a hypnosis machine to make his parent think the next day was his birthday to get a chemistry set, only for it to turn out to make them think every day was his birthday. After eventually getting sick of it, Jimmy decides to unhypnotize them, but the party clown destroys the machine in a misperformed party trick. The next day his parents tell him that (assumably because he's had so many birthdays) that he's now 18 and going to college, but they were just faking it and destroying the machine really made the hypnosis end (the bill for the clown was still there, though).
 * In the Sushi Pack episode "But is it Art?", once the Ominous Pipe Organ The Collector used to bring famous paintings to life is destroyed, the "art zombies" immediately return to their canvases.
 * Sort-of subverted in an early episode of Gargoyles, when Demona cast a spell on Goliath, transforming him into her thrall as long as she carried the original spell (or at least, the page from the book it was written in). While the book and the page that the spell was written upon were both recovered and Demona defeated, none of the gargoyles had the necessary magical skill to undo the spell, thus leaving Goliath stuck as a slave to whoever held the spell and fully aware of his actions and unable to stop himself. Elisa, however, came up with an elegant solution; she held the page with the spell written on it in her hands and commanded Goliath to live the rest of his life as if he'd never been put under that spell in the first place. Needless to say, it worked.
 * Generally averted, however. Spells cast tended to have permanent effects until either a counter-spell was used or an escape clause was evoked. Even Oberon's Children tend to follow these rules.
 * In the Swat Kats episode Chaos in Crystal the Monster of the Week, Rex Shard, transforms large swathes of the desert near Megakat City into crystal, as well as many kats, the prison he broke out of, and the water in the Megakat Reservoir. Transforming Shard back into a normal kat fixes it all, except possibly for the Warden, whose crystallized body was clearly shattered, but that was left unresolved.
 * It was left unresolved because the results would be something not showable in a cartoon series. It's almost Getting Crap Past the Radar, as it was most certainly fatal.
 * The Simpsons. In a Treehouse of Horror episode based on Bram Stokers Dracula, in order to de-vampirize Bart they have to kill the head vampire.
 * Tended to be the case on My Little Pony. For instance, when Tirac was killed his spells were undone.
 * In the first season finale of Transformers Prime, unleashes a whack of natural disasters all over Earth, including loads of tornadoes and a humongous tidal wave that rises above the cityscape. After he's been defeated, the wall of water plainly freezes mid-air and promptly falls apart, and the blowing winds also disappear.

Real Life

 * Small children (below 8 months) don't have cognitive functions for object permanence and have to acquire them. So if they can't see something anymore, the object—at least for them, which makes this at least partly Truth in Television—fades away as if it never existed in the first place.
 * "Peek-a-Boo!"
 * During the next stage, children understand the significance of objects and people disappearing, but don't quite understand that they can return. Cue the baby crying while Mom is away.
 * Puppies develop object permanence at around 8 weeks.
 * Working in technical support, it can be noted that, for many users, a similar lack of object permanence (mentally) can be seen. If a window covers another window for a period of time, long enough to have forgotten the other window, then fades out or otherwise disappears, the user will often think that the window from the past has just appeared or simply come up on the screen.
 * Can you really confirm the existence of what you don't see? Or even the existence of what you do see?
 * If a tree falls in the woods and nobody's around to hear it, does it make a sound?
 * Yes
 * Quantum-mechanics is the other way around. Particles are believed not to have certain characteristics until they are measured. It's not that we don't know what, say, its spin is until we measure it, it has no definite spin until after we measured it.
 * Though it should be noted that it's the physical interaction with the measuring equipment that does it, and would presumably still happen if nobody paid attention.
 * Quantum mechanics: the dreams stuff is made of!
 * Many examples of technology (and all young animals) cease to function (sometimes followed by a violent end to their existence) if they are abandoned for even short periods of time.
 * A lot of technology that relies on a rechargable battery will need recharging even if you don't use it for a few days. The Sony PSP is particularly notorious for this.
 * More worringly are items that rely on an internal battery. Sometimes these batteries die after many years and there are no batteries around to replace them. Nintendo's Famicom Disk System is like this (in addition to having a no longer manufactured drive belt), but the good news is that many of the games have been emulated in recent years and Nintendo hasn't forgotten about them.
 * Certain DRM schemes (that rely on communication with an authorization server) have a side effect of effectively making it impossible to legally use protected software after its maker goes out of business. Of course, with the maker no longer in business, there is no one to prosecute illegal use either.
 * In some versions of dodgeball, getting someone out makes everyone they got out come back into the game.
 * The documentary series Life After People speculates about Earth's return to its previous state should humans suddenly disappear.
 * That's a little different, as it's not simply all human things fading away because we disappeared, it's that every wears down over time, and thus with out people around to make new things, fix old ones, and generally counteract natural processes, everything else continues making and growing and changing and destroying everything humans created (and everything else too, essentially. That's all just replaced.)
 * To a certain extent, our vision and memories. Experiments have been done that shown that the brain will actively alter what we think we see (and have seen previously) in order to make sense of the world. For instance, by slowly altering a picture or the letters on a page or simply ducking behind a counter, most people will insist that the changed version is what they saw to begin with and only realize the difference once you show the before and after.
 * This has been taken to the extreme, with experiments having completely different people switch places and the test subject never even noticed.
 * In a way, this happened with the Mongol armies. Mongol tradition stated that if the khan died, everyone had to drop what they were doing and go home to mourn the khan and bury him. Thus, whoever they happened to be attacking at the time would suddenly find the Mongols leaving or gone.
 * Western Europe got VERY lucky when the rather young khan died of a heart attack, saving it from being being run over like most of Eastern Europe.