[quote=Garrison]
I can do that if you want but it isn't as invincible as you think, if he get's ran through say the heart, or his head is cut off, or he's cut in half, he's screwed. All the damage is real to him, he just doesn't feel it, the main purpose to keep the user focused in battle rather than flinching from the pain. He can very much die, so if he gets 100 cuts all over his body in not lethal areas like the heart and throat. He'll keep fighting like he's never been cut, think like Kenpachi Zaraki. However, those wounds can stack and eventually he'll drop even if he can't feel it. But now I gotta change my picture, I still don't know what else I'm doing, this is considerably harder than I anticipated.
[/quote]

Well Kenpachi kept fighting because the cuts actually didn't do anything to him, high Spirit Energy and all.

But I don't see how he'd drop if he couldn't feel pain dealt to him, unless an attacked actually caused him to drop. Brute force, achilles heel cut, etc.

The ability itself doesn't make him invincible, but if he could keep the ability going for as long as wants, that's what'll make him invincible because no matter how many times he's attacked he won't be hurt or weakened in the slightest unless it involved death or a body part getting chopped off (Which would be his only disadvantage in the fight). He risks nothing in a fight, there's no challenge, it's pretty much your character will enter any fight certain that he would win because I doubt you'd want to kill him off or get a body part chopped off. Which is why it's required to have a cooldown, and a duration, so we can avoid all that. What's the point of dangerous missions if you can just activate one ability the whole time that avoids him being hurt? Durations bro, they're needed.