User blog comment:Godisme/Natsu vs. Rogue/@comment-1454981-20130405173339/@comment-7418318-20130405223142

But he also said that if the age was ending and a new one began, it would be time for him to act again... or something like that.

Hm... Zeref vs. Ancalogia... since we havn't seen Zeref use anything close to the powers he's attributed with in the history books, it's hard to tell. In the long run I suppose Zeref has the advantage that he can create a limitless number of demons to fight for him, but in a single battle I suppose Ancalogia might have the upper hand/claw.