How Did Zeref Get Cursed?

History. Sometime over 400 years ago, Ankhseram cursed Zeref Dragneel with the Contradictory Curse as punishment for trying to devise a way to bring his brother, Natsu Dragneel, back to life.

Why did Zeref become evil?

In fear of the curse's deadly effect, Zeref isolated himself along with his emotions. If he could suppress any sort of feeling of love, no one would have to die to his curse. At the same time, this caused Zeref to become conflicted between good and evil.

How did Zeref and Mavis have a child?

August was conceived of Zeref Dragneel and Mavis Vermillion some time after August of X697 through unknown circumstances; he was birthed by Precht, and had immense Magic Power, but was soon abandoned, and frequently stole as his means of survival.