Random Incredibly Strong Anime Attacks That Were Only Used Onc (13 items)

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  (#8) Dark Young - 'Overlord'

  There are a lot of reasons why Ainz Ooal Gown is considered to be wildly OP, and Dark Young is one of them. By sacrificing 70,000 members of the  Royal Army in one shot, he's able to summon the Dark Young. These Eldritch abominations look like slobbering goats with tentacles, and they make short work of the rest of the army. The majority of the army was composed of untrained peasants, but even the strongest warriors couldn't have possibly stood up to that mess. 
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  (#13) Muscle Gravity - 'Ultimate Muscle'

  Not too many anime fans remember this series, but that doesn't make its epic one-time move any less epic. When Kid Muscle goes up against the seemingly far stronger Kevin Mask during a tournement, he manages to turn a seemingly one-sided fight around by developing an ultimate move that reverses his opponent's attack at zero hour. This is after getting both of his arms broken, among other injuries.
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  (#7) The Tree of Depravity - 'Yu Yu Hakusho'

  Fresh from a fight in which he was forced to take a child's life, Kurama isn't in the mood to play around when he faces Elder Toguro. Now a parasite inhabiting Makihara's body, he can regenerate infinitely and therefore will live forever, which is what makes this attack particularly cruel. Kurama summons the The Tree of Depravity, which sucks the life out of whatever being it has in its clutches until that being passes away, all the while forcing it to endure endless hallucinations. Since Elder Toguro is functionally immortal, the torment will never end. 
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  (#2) Mugetsu - 'Bleach'

  After using a technique called Saigo no Getsuga Tenshō, Ichigo Kurosaki is able to achieve a form called Getsuga that dramatically changes both his appearance and his strength. Once in this form, he's able to use Mugetsu. Mugetsu lets him generate a huge black blade of Reiatsu energy that severely damages everything unlucky enough to enter its path.

  Using Mugetsu means the loss of Ichigo's Shinigami powers, so it's a huge gamble. Luckily, he managed to land a hit that forced Aizen to revert to a previous evolutionary stage, making it possible to defeat him.
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  (#3) Indra's Arrow - 'Naruto'

  Indra's Arrow, a technique named for one of Sasuke's ancestors, is the ninja's strongest attack, period. By absorbing chakra from all nine tailed beasts and combining them in a vessel made from Complete Body — Susanoo, Sasuke creates a spectral bow and arrow that he uses to launch at his opponent: his best friend and greatest rival, Naruto Uzumaki.

  Despite the intense power of Indra's Arrow, it's actually not Sasuke's finishing move in his final fight against Naruto. Rather, it's Chidori, one of the first moves he ever learned.
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  (#10) Kidō Cannon - 'Bleach'

  The Kidō Cannon appears in Bleach: Memories of Nobody, the first film in the Bleach franchise. It's a crystaline cannon that's powered by the energy of hundreds of Shinigami working together. The blast is so powerful that it's capable of wiping out a small dimension. That said, it can't be used more than once. After a single use, it burns itself up and becomes a functionless pile of junk. 

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