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

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  (#1) The Eighth Inner Gate - 'Naruto'

  Might Guy isn't the only person to open all Eight Gates, but he only does it once, and he's one of the only people to survive it. The Eight Gates are a series of blocks that prevent a person from using the full extent of their power. Removing each gate grants greater levels of strength, but it also damages the body. The Eighth gate allows the user access to a forbidden Taijutsu technique called Night Guy, but it also typically results in the person being fully destroyed.

  Might Guy opens the Eighth Gate only once, during a climactic battle against Madara. He survives thanks to Naruto's Yin–Yang Release, but his leg is permanently damaged. As a result, he starts using a wheelchair.
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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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  (#4) Zero Hand - 'Hunter X Hunter'

  To use Zero Hand against Mereum, Netero had to meditate for several days. After finally mustering the spiritual power to summon a bodhisattva, he concentrated every last drop of aura he had into its mouth for a dramatic blast attack. This hurt Mereum more than a thousand previous strikes combined, but it still wasn't enough to take the Chimera Ant down. 
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  (#5) United States of Smash - 'My Hero Academia'

  United States of Smash is All Might's most powerful technique. It's not that different from his other attacks - it's a powerful punch with a ton of energy behind it - but the energy levels are on another planet. He managed to grind his nemesis All For One into the dirt with it, despite the fact that his quirk had been mostly transferred to Izuku and his severe injuries made it difficult for him to fight at all. This would be All Might's last fight, and it was one of his most epic.

  This isn't really the first time All Might used the attack, but it's the only time viewers get to see its full glory. Too bad, because it was probably ten times more amazing when the man was at his peak. It's also possible that this won't be the last time we see United States of Smash, either. While All Might's powers were extinguished, Izuku still has a lot to learn about the complex quirk he inherited. 
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  (#6) Flame Emperor - 'One Piece'

  Flame Emperor is Portgas D. Ace's most incredible attack. Using his Flame-Flame Fruit, he creates an enormous fireball that resembles the sun. The thing nearly engulfs an entire island. An impressive display of strength, but unfortunately not enough to take down Blackbeard and his Dark-Dark Fruit. 
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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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  (#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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  (#9) Super Tengen Toppa Giga Drill Break - 'Gurren Lagann: The Movie'

  The Super Tengen Toppa Gurren Lagann is an enormous mass of energy that breaks all laws of reality, so naturally it's most impressive attack, Super Tengen Toppa Giga Drill Break, is guaranteed to do the same. The drill itself is 20 trillion light years long - 200 times bigger than the universe itself. It also moves faster than light, travelling that distance in a matter of seconds. When the attack collides with the Anti-Spiral Giga Drill Break, space-time collapses on itself. That's the kind of thing you can't do more than once. 
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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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  (#11) Final Stage - 'The Big O'

  The battle against Alex Rosewater and Big Fau might have been lost if not for this one-shot power-up move. By linking herself to the Big O itself, Dorothy is able to transform it into its final stage. The biggest change that the mecha undergoes is the appearance of a giant cannon in the middle of its chest that can fire off enough energy to destroy a giant dome. The Big O was already powerful, but this change makes it one of the most formidable mecha outside of the Gundam franchise.  
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  (#12) Silence Glaive Surprise - 'Sailor Moon'

  In order to defeat Queen Nehellenia, Sailor Saturn, also known as Hotaru, uses her Silence Glaive's ultimate attack, Silence Glaive Surprise (this is only in the anime - the manga version has an even gnarlier final move). Silence Glaive Surprise is a wildly powerful energy attack that destroyed a castle before it was even warmed up.

  The full impact of this catastrophic event is still unknown, since Chibiusa stopped Hotaru from fully executing it. If she hadn't, Hotaru would not have survived. 
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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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