Capítulo 539: 8.12.2 An old friend.

What happens when you get stabbed in the head? 

Is death instant? Well yes, for most mortal humanity that seems to be the case. And in the grand scheme of things, those are considered the luckier than the ones that do survive such injuries. 

What one becomes after such a blow to the head is unpredictable and in most cases one loses many functions of their body, turning into a living corpse. 

But such is the case for the Mortals and not much changes for those that transcended mortality as well. 

Throughout history, no matter how strong you get, unless you hold a specific bloodline, the head will remain the most vulnerable. As with its destruction, even if one can regenerate, they will be rendered useless for a little bit. Unable to make any proper moves.