User blog comment:FairyRaven/Fairy Tail Chapter 389: The Twin Dragons vs. The King of Hades, Review and Commentary/@comment-5303512-20140620143443

I honestly think it will be something like from the Diablo lore where a human prince Aidan defeated Diablo and binds his soul to him in order to contain him but he eventually loses himself, he then met the human witch Adria, by Diablo's will she got pregnant with his daughter Leah who would eventually serve as his vessel in the game Diablo 3.