User blog comment:Add799/Nine demon gates a type of celestial spirit magic?/@comment-1359322-20131028145819

You know you mentioning the gate thing just made me thought of an entirely new theory, since the Nine Demon Gate continuously mentioned about opening the "Gates of Hell". What if E.N.D. is sealed in hell by Igneel, Atlas only said Igneel failed to destroy it but maybe Igneel managed to seal E.N.D. into hell and defeating all 9 members of the Nine Demon Gate is the method to unsealing E.N.D.