Board Thread:General Discussion/@comment-25926288-20170410010002/@comment-26186122-20170410161721

CoolDudeAl wrote: I have a good theory that the Black Fairy could have been the evil fairy that turns the prince into a beast in Beauty and the Beast, but I'm seeing this as less likely after this episode.

Maybe, it's still partially correct. Rumple said "All the Darkness you've ever faced was born under one twisted soul, the Black Fairy." So I think she created the first Dark One (Nimue) by cursing the Holy Grail before Nimue drank from it. If she created the Dark One powers in a way she would have indirectly turned Rumple into " a beast".