User blog comment:Miskos3/Fairy Tail 529: Teacher, Review/@comment-5006572-20170402134912/@comment-86.70.179.235-20170402141139

Zeref once said that many eras have come to an end, maybe Acnologia has participated in the destructions, but without witnesses, no historical traces are available, it may also have attacked humans like Guildarts and Killed them.