User blog comment:Lex wa Kaiho/What is Lumen Histoire?/@comment-49.205.91.207-20140821015928

I think the same. It might be the good side of zeref that got seperated from him when he was consumed by the darkness n became the dark wizard. As a dark wizard he might find the light of his very problematic n in order to protect the good side of zeref,Mavis seals it away in a way that no one except a fairy tail member can realize it.(considering the hostile atmosphere between the two of them.

It might also be the most strong dragon or fairy that can take on the dark wizards monsters (E.N.D n Acnologia). Or at least give the strength to do so to the Magi that is most likely to have a cha CE against them.