User blog comment:IamJakuhoRaikoben/Chapter 411: Quid Pro Quo, Review./@comment-4489126-20141201153419/@comment-5840892-20141201172438

Zancrow was a God Slayer. Not a Demon Mega.

But there is something that STILL is nagging in the back of my mind. The demon king with 20 foot flames flying from his ass made it sound like earlier that Dragon Slayer was not originally a type of Magic, but a Curse..... So is there a Dragon Slayer Curse? And we know E.N.D is a flame Demon, maybe he's a Demon with the Flame Dragon Slayer Curse? THAT would be an interesting fight. Fire Dragon Slayer Magic (Natsu) VS Flame Dragon Slayer Curse (E.N.D.).