Dangerous Forbidden Technique: Difference between revisions

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Compare [[Deadly Upgrade]], [[Cast From Hit Points]], [[Cast From Lifespan]]. If they constantly survive these it's a case of [[I Thought It Was Forbidden]]. See also [[Godzilla Threshold]] and [[Lethal Harmless Powers]].
{{examples|Examples}}
 
== Anime ==
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** In the second half of the manga, Naruto gains his Futon: Rasenshuriken, which is so powerful it actually causes widespread cellular damage in the arm he executes it with, which is far too minute for healing jutsus to repair. Tsunade even tells him not to use it again. After mastering [[Super Mode|Sage Mode]], he perfects it so he can throw it, thus nullifying the risk to himself.
** Lady Chiyo's clan dabbles with using chakra "strings" to control life-size puppets (and in some cases, assist a human by adding their reflexes to the subject's); they began work on a jutsu to truly breathe life into puppets, but stopped when the beta technique had a nasty side-effect of (you guessed it!) killing the user of the jutsu. {{spoiler|Chiyo winds up [[Heroic Sacrifice|using it]] to save Kazekage Gaara (yes, the same Gaara that houses a demon, not unlike the titular Naruto).}}
** Hell, the deeper level of his Kyuubi form actually shortens his lifespan too. That's without considering the whole [[Super -Powered Evil Side]] transformation.
*** As does Tsunade's own regeneration jutsu, which is consequently only used when there's a danger of a much more drastic shortening of her lifespan.
** Pain has been shown to have {{spoiler|an ''[[Wave Motion Gun|incredibly]]'' powerful version of his gravity attack that takes off years of his life, but can ''destroy an entire city in one blast''. And he uses it.}}
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** The Dead Demon Sealing Technique summons the fricking Grim Reaper to tear out your opponent's soul, and your own, and then forces them to fight forever in its stomach.
** The recently revealed {{spoiler|Izanagi}} allows users to cast genjutsu on ''themselves'' that can briefly override reality. As a tradeoff, {{spoiler|the eyes used to cast the genjutsu will close forever}}.
* The title character from [[Inuyasha]] can allow his demonic blood to temporarily dominate him by casting aside his mystical [[BFS]], or having it stolen, which means it borders between this trope and [[Super -Powered Evil Side]]. This "demon form" makes him a lot stronger but the more times he uses it, the more [[Deadly Upgrade|his soul decays]]. This may not sound like much, but what it actually means is that he becomes a [[Unstoppable Rage|berserk, vicious killer]], and the more time he spends in this form, the more indiscriminate he becomes in choice of targets. It also becomes easier and easier to activate, and harder and harder to turn off... which means that he will, ultimately, become nothing but a mindless killing machine that can do nothing but wander aimlessly and slaughter everything in sight.
* ''[[Rurouni Kenshin]]'' used this trope on both Shishio and Kenshin. {{spoiler|The full body-bandaged Shishio would and did die from heat exhaustion after 15 minutes. Kenshin was forced to retire from swordmanship for good because of his overuse of the Hiten Mitsurugi Ryuu, as his fighting style is meant for more muscular men.}}
** Hiten Mitsurugi Ryuu also has an ultimate technique that involves putting yourself in significant danger. If you hesitate even the slightest amount, you either die or lose your leg. If you don't hesitate, you might still lose your leg.
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*** Monster Chopper also qualifies. While he does gain immense power {{spoiler|enough to curb-stomp Kumadori}}, he not only loses his sense of self, but also harms himself due to the energy required to maintain the form.
**** {{spoiler|Not anymore: He can now keep control of himself while in this form, though once it wears out he's left pretty much helpless for a while.}}
* Whenever Ichigo used the black getsuga tenshō in ''[[Bleach]]'' he weakened his hold on his body and allowed his [[Super -Powered Evil Side|inner hollow]] to take control. This was only recently averted when he mastered his hollow side, but there is a noticeable decline in his humanity every time he uses it in battle, resulting in Orihime being just as scared of him as his opponent when he used it in front of her in Hueco Mundo.
** There's also Ishida's complete loss of his powers after his fight with Mayuri, during which he's forced to Do What Must Not Be Done. {{spoiler|He got better.}}
** {{spoiler|Ichigo's "Final Getsuga" will have the same side effect. This might also explain Ichigo's father's power loss (he only started recovering them a few story arcs back).}}
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* ''[[Team Fortress 2 (Video Game)|Team Fortress 2]]'': There is an unlockable weapon for the Demoman class called The Eyelander, a massive sword which decapitates and heals its user on a killing blow. The downside is that having the sword in your loadout reduces your max HP by 25, because the blade ''feeds on your soul''.
** Averted when, upon killing enough people with the eyelander, the Demoman becomes second in max health only to the Heavy and in speed to the Scout (or a Soldier with the Equalizer at maximum effect).
** A more appropriate example is the Equalizer. It's possible for a [[Jack of All Stats|Soldier]] to become [[Fragile Speedster|super fast]] and [[Glass Cannon|do huge damage]] when wielding the melee weapon and [[One -Hit -Point Wonder|at low health]]. Obviously while powerful, using the weapon this way is very risky, as a casual shot could kill the soldier. Oftentimes cornered soldiers with no rockets use this tactic as a last resort.
** A sillier example is the close combat Ullapool Caber. Is it a giant log that takes health of the user when you swing it? No. It's a stick grenade, that you whack people with. It only works once, and you sure as hell are going to feel it if you don't have any bonuses because it explodes in your face. Despite the fact that you are dead if you come across another enemy, it's quite deadly, and can be useful as a last resort or for [[OHK Os]] with a critical charge.
* The first four [[.hack|.hack//]] games feature Data Drain, a technique that allows the user to either severely weaken a computer-controlled enemy, or [[Mind Rape]] a human being (most humans hit with a Data Drain end up in comas). The hero, Kite, is the only human with the ability. He uses it to weaken game enemies that have been hacked so as to have infinite HP, thereby making them defeatable, and to gather virus data to hack into protected areas of the game. The catch is that repeated use will corrupt his character data with the virus, causing nasty side effects in battle and, eventually, his character's death.
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* The "Mortal Draw" in ''[[Twilight Princess|The Legend of Zelda: Twilight Princess]]''. The attack involved sheathing your sword and untargeting the enemy. As soon as the enemy is within range you quickly pull out your sword and deliver a powerful attack able to one-shot most enemies. However, if you screw up the timing you're going to get hit.
* [[Blood Magic]] in the ''[[Dragon Age]]'' [[Dragon Age II|games]]. It is ''extremely'' powerful and dangerous -- [[Bloody Murder|to]] [[Mind Control|enemies]], [[Powered By a Forsaken Child|allies]], [[Cast From Hit Points|and the user]] -- and for many, many reasons, it is forbidden everywhere in the world. Even the Tevinter Imperium officially condemns [[Blood Magic]], though in practice all of the Magisters are secretly Blood Mages.
** Though the [[Well -Intentioned Extremist|Grey]] [[Knight Templar|Wardens]] don't forbid blood magic.
* In ''[[Trauma Center]]: Under the Knife'' Derek's senior surgeon forbids him from using the [[Bullet Time|Healing Touch]] after his first intentional use of it makes him collapse after the operation... with the caveat he's completely aware Derek will merrily ignore this instruction if he thinks the Healing Touch will mean the difference between life and death.
** This is meant to communicate to the player that they should only use it as a last resort, as doing so will negatively impact their score. [[Guide Dang It|Good luck figuring that out without trial and error, though.]]
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* '''[[MS Paint Adventures|SEPULCHRI-]][[Problem Sleuth (Webcomic)|TUUUUUUUUUDE!!]]'''
** [[It Makes Sense in Context|"No, you fool! Don't you realize if you initiate that attack, it will be the last thing you do??? Fiesta smacks some sense into you."]]
* '''[[Eight 8-Bit Theater (Webcomic)|HADOKEN!!!!]]'''
** Although not considered forbidden, Black Mage is only able to cast that spell once a day, and it makes a cute little [[Nuke 'Em|nuke-sized]] crater wherever he aims it.
** Spells that drain the net amount of love from the universe with each use and require the sacrifice of orphans to gain in the first place tend to have a bit of a social stigma against them. Black Mage seems to find an excuse to use it nearly every day...but then again, this is [[Complete Monster|Black Mage]] we're talking about here.
* [[Last Res 0 rt|Jigsaw Forte's Zombie Mode]], while not explicitly a [[Dangerous Forbidden Technique]], effectively becomes this when you realize if she uses it ''at all'' while on camera, she's blown her personal [[Masquerade]] (which means if she doesn't die from using it in the first place, ''she will'' when she's done).
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* The destruction of HMS ''Invincible'' at Jutland. The [[Dangerous Forbidden Technique]] in this case was the bypassing of safety protocols designed to prevent flashdown of a detonation in a turret from reaching the magazines, and it was done to increase rate of fire. But ''Invincible'' was pounding the crap out of the German ''Lutzow'', so why not? Why not, indeed. The mist that was hiding her cleared, just long enough for two other German battlecruisers to get some solid hits in in the right place, and ''Invincible'' was blown in two. At least one and possibly both of the other British battlecruisers lost that day went up for the same reason.
* In soccer, the awesome techniques of jumping up in the air and trying to hit a ball next to another player is usually forbidden, because it could hurt the other player if he'd get hit by a flying boot. A little more mild, but still similar is the "scissors" technique of scoring.
* [[Nuke 'Em|Nuclear weapons]]. Nukes are capable of great destruction, but actually using one comes at a hefty price. Large nuclear detonations release irradiated material into the surrounding environment that remains dangerous long after the explosion is over. In a more immediate sense, several nations have active nuclear weapons that are kept ready for launch at all times. Since there is currently no viable way to defend against a nuclear weapon after it's been launched, the target has no reason not to fire all its weapons at the aggressor. This is the concept of Mutual Assured Destruction (MAD,) and it effectively makes using nukes suicidal. Note that in World War II, this was not an issue; with no other nuclear-capable countries to provide the "Mutual" portion of MAD, the United States was free to attack Japan without fear of a similar retribution.
** Nukes are literally forbidden by international law; even ''threatening'' to use nuclear weapons against another power constitus a war crime. Of course, some countries do still keep them anyway...just in case. On the other hand, Mutually Assured Destruction is actually now a defunct policy, because America and Russia decided that destroying the entire planet over even just a single nuke was even more insane than launching the nuke and taking that chance in the first place. Given how much damage a single nuke can do, and given that whoever uses it will face the wrath of the rest of the planet, this makes as much sense. Nowadays, anyway, the worry is more about the dangers of non-state actors (ie. terrorists) using them instead, which MAD would be powerless against at best.
* This trope is usually very heavily subverted in real life, due to [[Combat Pragmatist|Combat Pragmatism]] being a time-honored military and general combative doctrine. If it's dangerous and highly lethal, using it is the best way to win. If it's forbidden, all the better, because that means the other guy will never see it coming.