User blog comment:Derax-Pagani/Chapter 507: Voice/@comment-5894890-20161025000918/@comment-130.105.140.154-20161025010500

And to this day the Spriggans haven't been fleshed out. We don't even know how their immense power came to be. And you got to remember, Zeref is supposed to be the big bad in this arc.

P.S. I also want God Serena to be fleshed out even further. Same goes for Mari.