User blog comment:Water Dragon Slayer/DREAM BATTLE CHRONICLES: SECOND MATCH!/@comment-4829046-20130723104110

Thanks for accepting my suggestion XD

Anyways. I feel that if they faced off for real all the land would shake. I'm sure that Mavis has more tricks up her long sleeves than just the 3 great magics and Zeref in Kill-everything mode would be using extremely grand scale attacks and summoning Demons everywhere and possibly even Humans turned into Dragons. Mavis hasn't shown an ability to summon anything but judging by the fact that she was called the "Fairy Tactician" she can indeed call upon armies presumably.

However since for now Mavis is in spirit form and cannot directly interfere with Zeref I have a small hypothesis. What if this in only a part of Mavis? What if she pulled a Naruto and sealed the rest of her power in the guild and that is what Lumen Histoire is? Hey I can guess. And that would make Mavis Vs. Zeref come true.