User blog comment:Derax-Pagani/Fairy Tail Chapter 494: The Hill Extending Towards Tomorrow Review/@comment-6401212-20160719062926/@comment-6401212-20160721074105

@Johnny

Exactly. Same with Serena, Wahl and Bradman being brought back. If any more Spriggan die he can just bring them back. If summoning too much of them is a problem then he can pick the most powerful that died to bring back. And that's just Spriggan.

He already brought back Hades, why not Zero and Mad Geer? Or, if his power can go this far, use old enemies Zeref has seen during his lifetime or from someone else likewise. I'm sure Zeref has encountered powerful people during his lifetime that could help. It's also possible for Acnologia too and so on. Of course, if his power can go that far like I said. It'd be pretty cool.