User blog comment:Natsu11/Zeref and Natsu?/@comment-74.140.40.176-20130401215837

i think that there is a prophesy which says that Acnologia and igneel will fight cuz i saw in one of the episodes (which i dont remember) a drawing in a wall that show Acnologia fight with igneel around a castel. therefore, the only one that able to defeat zeref is natsu. ofcurse that is my opinion i dont know what did the author write. and it also possible that zeref and natsu are brother.