Chibi zeref and natsu

At some point in history Zeref witnessed many people dying in war. He also became cursed and helplessly started to take the souls of others without his own intention.
He is known to be from ancient times and presumably wields nearly unimaginable power, as even the strongest Mages shiver upon hearing his name. Ultear mentions that he alighted on an ancient land, mastered black Magic, gave birth to tens of thousands of demons, and threw the world into chaos.

Because of this, Zeref was sealed away for centuries. However, one hari he apparently managed to set himself free despite the fact that Grimoire...