User blog comment:IamJakuhoRaikoben/Chapter 444: Emperor Spriggan, Review./@comment-87.202.77.97-20150714153312/@comment-26350059-20150714175240

I would like to see a back story on Acnologia. Mashima did one for us on Zeref. Why did he and the other Dragon Slayers turn against the dragons. Is there a bigger threat that he knows about and why did they all disappear around the same time? He is a big mystery.

I also don't like long series but like DBZ they ended one story line and started a completely new one, several times.

Since Zeref is leads the Spriggan 12, is it safe to say that they knew of Tartarus and there mission to revive END?