Board Thread:Spoilers!/@comment-25613119-20150304154923/@comment-5817180-20150330052615

Also, could this be the source of Emma's magic?! We know that her parents cannot (or at least don't) use magic, so perhaps she obtained her light magic due to taking on all of Lily's goodness, while lily took Emma's darkness. And since Lily's mother, Malificent, was a magic-user, perhaps Lily inherited her mother's magic, and subsequently, the light magic inside of her was taken on by Emma. And we know if Regina can have light magic in her, so can Malificent, and Malificent's daughter.