Yeah, shallow cuts wouldn't count but something that would majorly impede him in battle like, say, a severed limb or broken bones would count. Same goes for having a hole blown through him, should something like that happen. |D And I'm tempted to say that his hair will also insta-regrow just for the heck of it and because it can be so nicely abused and get in the way.

Ah, I meant those that can only be unlocked through high enough resonance usually since Hades' only active Weapon ability is emitting a passive wavelength of fear/madness. It's fine if this is too much, though.