Not even sure if this is even possible but my idea is as following:
I think it would be great that when you kill an enemy you actually feel like you really killed him
instead of just having a final slash and he dies with only some blood covering his face.
So my suggestion is that when you have your last hit at an enemy (the killing blow) and you hit hes head you cut their head off.
This would work for different kind of hitboxes for example, when you hit their arms you cut a hand off, if you hit their chest you would see a major wound.
This shoudln't look rediculous ingame, like too much body parts flying around, you get my point.
I just think it would bring in a better experience if you could actually see some damage that you cause with your enormous weapon.
What do you guys think about this?