User blog comment:Varzan Deodinm Beldinm/Most Powerful Semblance?/@comment-10380701-20150109024314

Varzan. You should watch Fate/Zero. There's a character there that uses a more brutal version of what you described.

Imagine an Aura Killer semblance. If he hits you with it, your own aura fucks you up, leaving you with half your body paralyzed and your aura pretty much burned out.

As for overpowered shenanigans, time manipulation is way up there. Not just slowing down time. Fast forward, backward, pause. Those all at once.