User blog comment:BlackWizardZeref/Fairy Tail: Chapter 380 Hell's Core/@comment-76.124.155.27-20140413200702

I'm starting to get the feeling that Zeref created Fairytail and was corrupted so Mavis took over. I think maybe a part of E.N.D.S. mind is trapped in Zeref and with a desperate action Zeref locked whatever was destroying the world into books.

The biggest mystery is why is Natsu and Gajeel over 100yrs old