Minimike3636 said:
It would have to be Sephiroth, when he fights you in Kingdom Hearts II.
He does this random thing where the screen lights up or goes black (I forget which one) and then he automatically hits you for, like... A billion damage. So it's essentially a one hit kill. I was the highest level possible and I tried several times before I beat him. I have no idea if there's some strategy or any way to counter it, but in the end, it only takes about 50 potions and 20 hours of preparation for you to win.
Ah, I think I get the attack you mean. Isn't that the one which he always starts off with? If it is, I'm sure there's a Reaction Command for it, but only when you're on the ground, and that's the only way of blocking it completely.
Still, he was a really fun boss, and had some kick-ass attacks. Heartless Angel springs to mind, as does his Meteora attack from the first Kingdom Hearts.
More Kingdom Hearts boss fun!
Demyx: His timed water form attack is a *****, especially in the data battles for Final Mix+, where you only have 30 seconds, and he can summon any number of forms.
Riku: In Kingdom Hearts, under the control of Ansem. His little attack, heralded by "
I'll show you the true power of darkness!" or something, where he flies around the screen, teleporting and stabbing.
Enigmatic Soldier: Just. Painful. No single boss has ever made me work so hard to defeat him. Well, maybe that's an exaggeration, but he is pretty damn difficult.