User blog comment:Miskos3/Fairy Tail Chapter 374: Revolution, Review/@comment-5303512-20140307135954/@comment-5303512-20140307162123

Well the thing about that is quite interesting,like how did Hades start Grimoire Heart? Maybe the demons of Tartarus convinced him of Zeref and the Great World of Magic. Maybe that is how Grimoire Heart was made, maybe they were pawns to Tartarus?