User blog comment:Miskos3/Fairy Tail 527: Emotion, Review/@comment-4507125-20170317032527/@comment-7418318-20170317065237

Considering Zeref's reputation I'm quite sure he went through at least one such phase before. Otherwise there would be no reason why historians to call him evil... even know of his existence in the first place. Chilling on Tenrou wouldn't have had his name go down in history after all.