User blog comment:Miskos3/Chapter 478: Stealth, Review/@comment-4401815-20160320011047/@comment-26389992-20160320205739

I would agree with this theory if Zeref wasn't immortal... why would he need the 12 to be like keys to his life force when he already can't die? Jokes aside about Mavis stripping to kill Zeref, it might just have to do with banishing him to an alternate dimension or something or making him disappear idk, cause if he dies Natsu gonna die too and that ain't happening