User blog comment:Water Dragon Slayer/DREAM BATTLE CHRONICLES: SECOND MATCH!/@comment-5552025-20130724035915/@comment-7418318-20130724074527

While I think Natsu will be the one to strike the killing blow to Zeref, that doesn't mean he has to fight that final battle alone.

Natsu also struck the finishing blow to Hades, but only after beating him down with the help of the others.

And I hope that Zeref will be the final opponent of the series (either him or Acnologia, though I'd prefer it to be Zeref). He was set up as the strongest mage ever alive from the very beginning of the series so it'd suck to suddenly have an unknown new enemy crawl out of the woodwork who's stronger than Zeref but still managed to remain completely hidden and unknown till now.