User blog comment:TheCarrotSaysYumYum/Dragons, People and Demons.../@comment-4866818-20120721163256

Awesome theory, really thought out. Though, the part with Mavis and Zeref is pretty skeptical for me. The only Magic that we saw from her is the three Big Fairy magics. They're a bit similar to Light Magic (from what almost everyone seems to think) but Mavis is not the only person who can use them, aka the Dreyar Family and Cana. The thought that she was/is a Dragon Slayer is interesting but even so, her Magic would have to be a bit peculiar.