Board Thread:Versus Debates/@comment-35057921-20191023205948/@comment-43403813-20191027231515

The thing is though, her head is the source of all her powers. So even if blasting her head off didn't kill her, she wouldn't be able to function in terms of her Byakugan and Rinnesharingan powers, as well as simply using her brain to control her muscles, arms and legs.

We've never seen any person lose their head and subsequently regenerate it. The closest thing we have is Hidan, but his head wasn't completely destroyed like the hypothetical situation where Kaguya's head is destroyed by a Night Guy kick.