Takes One to Kill One: Difference between revisions

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* Ryo Takatsuki's [[Nanomachines|nanite-powered]] [[Super-Powered Evil Side]] in ''[[Project ARMS]]'' has a unique power to negate the [[Healing Factor]] of other ARMS.
* ''<nowiki>[[Blood: The Last Vampire]]</nowiki>'' has this as its basic premise.
** Same goes for its [[Spinoff Babies|spin-off series]] ''[[Blood Plus+]]''. Chiroptera are only vulnerable to the blood of an opposing queen, and about the only thing that can kill a Chiropteran queen is another queen.
* The plot of ''[[Eternal Sabbath]]'' revolves around getting Shura to kill Isaac, as Shura is the only one who understands Isaac enough to stop him.
* In ''[[Yu-Gi-Oh! Zexal]]'', the [[Gotta Catch Em All|Numbers]] monsters cannot be destroyed in battle except against another Number. [[Subverted]] in that they can still be destroyed by card effects, and it's entirely possible to [[Power Nullifier|negate their invulnerability]] so that they can be destroyed by ''any'' monster.
* In ''[[Baccano!]]'', the only way an immortal can die is to be [[Identity Absorption|absorbed]] by another immortal.
* ''[[Puella Magi Madoka Magica]]'' seems to [[Playing With Tropes|play]] with this trope. At first, the Puella Magi magic appears to be the only way to kill Witches (straight trope), but it is eventually revealed that {{spoiler|Akemi Homura actually uses firearms and bombs}} (subversion) {{spoiler|to kill Witches off, because of her comparatively weak offensive powers}}. And then, in episode 11, {{spoiler|she blasts Walpurgis Night with literally thousands of explosions and doesn't even manage to scratch her (keep in mind she usually manages to kill witches off with barely one hundredth this firepower). For all intents and purposes, it turns out Walpurgis Night can only be defeated by a Puella Magi's powers}} (thus, double subversion).
** {{spoiler|And in a cruel double subversion, [[And Then John Was a Zombie|it turns out that Puella Magi are actually 'immature' witches.]]}}
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== [[Mythology]] ==
* [[Older Than Feudalism]] example: In a poem ascribed to Theocritus (3rd century BCE), Hercules discovered that the only thing that could pierce the Nemean Lion's hide was its own claws. Hercules had already strangled it to death by this point -- hepoint—he just wanted to [[Nemean Skinning|skin it]].
* In an undated [[Greek Mythology]], the twin giants Otus and Ephialtes were so strong they could only be harmed by one another. Artemis tricked them into shooting one another with their spears, killing both brothers simultaneously.
 
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** And the final boss must be [[Playing Tennis With the Boss|taken down with his own projectiles]].
* In ''[[Persona 3]]'' and ''[[Persona 4]]'', [[Summon Magic|Personas]] are actually {{spoiler|Shadows (with Shadows themselves being the coalesced feelings of despair and loathing in all people, so it can be said that Shadows are the Persona of humanity)}}. As such, they can (and have) {{spoiler|turn back on whomever they're a Shadow of and consume them}}.
* Perhaps rather famously, the Dragon type in ''[[Pokémon]]'', though it is also weak to [[An Ice Person|Ice]]. Generally, this a better bet anyway, since fighting dragons with your own dragons makes them into [[Glass Cannon|Glass Cannons]]s, naturally.
** Same with the Ghost type, though they're vulnerable to a number of other types as well.
* "???"-type enemies in ''[[Alter AILA Genesis]]'' are the enemies who use Psych-elemental attacks the most often, but they are also the only enemy weak to it.
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== [[Web Comics]] ==
* In ''[[Homestuck]]'', it's believed that one way to kill a nigh-invulnerable First Guardian (or a creature possessing its powers) is to send another to fight it.
* In ''[[Sluggy Freelance]]'' Bun-bun tried this on [http://www.sluggy.com/comics/archives/daily/20010618 Lodoze] - while not enough to kill him, having his own hand hammered into the nose (in addition to... other unpleasant things) removed him from action for long enough.
* ''[[Vexxarr]]'' had the Bleen crew [http://www.vexxarr.com/archive.php?seldate=091708 tried this approach on Rock Crabs] who "boarded" their ship via mass driver, right through the hull - after they found out that their personal weapons at most can make these critters sated and sleepy.
 
 
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* Parodied in a "What If" episode of ''[[Futurama]]'', where the Planet Express crew creates a Giant Zoidberg as only an "even equally big" monster could defeat a 500 foot tall monster rampaging through the city. [[It Got Worse|This fails miserably as Giant Zoidberg immediately goes on a power trip and rampages through the city, and so the two giants fight and kill each other in the ensuing turf war]].
** In the second movie, ''The Beast With A Billion Backs'', electromatter can only be damaged by other electromatter.
* ''[[Ultimate Avengers]]'' provides a technological example: [[Green Rocks|vibranium]] [[Made of Indestructium|armor]] can only be penetrated by vibranium weapons.<ref>this is implied to be the case in the rest of Marvel's works, but this is the only work that outright states it</ref>.
** [[Nuke'Em|Nuclear warheads]] and [[The Hulk]] also work, but those tend to be [[Melee a Trois|more trouble than they're worth]].