User blog comment:Kiraofthesky/Zeref/@comment-173.35.174.29-20150312202310

I always thought Zeref would be killed with some form of life magic, or purification magic, idk. Something that naturally counters death magic, and he's supposed to be dead hundreds of years ago, so if life is brought into him, he'll die.

BUT idk, I have no idea, and immortality is hard to beat. What if the protagonists pull a Hidan and just bury him for eternity? Knowing it's FT, probs not. But I sure am curious...