User blog comment:Miskos3/Fairy Tail Chapter 490: Fairy Tail Zerø, Review/@comment-130.105.225.146-20160620133938/@comment-9595671-20160621023556

It'd probably need to be a flashback or seeing another realm, cause if Anksheram were to actually show up... The best way to define it would be Zeref, Acnologia and a God fused into one.

The former two are already near-unbeatable, if he showed up physically in the present... He would definitely one-shot Acnologia just like he did the same to Igneel.