Board Thread:Spoilers!/@comment-27060727-20170218051023/@comment-24674051-20170313153436

We don't konw that Blue knew about the Dark Curse. I agree that there is some implication, but it was Rumple that suggested a curse, and Blue's response was very non-commital.

I also agree that Blue's knowledge of what the curse was capable of does suggest some prior knowledge. But that's all it is is suggestion and speculation.

As for the Black Fairy creating the Dark Curse, I will have to suggest otherwise. She is guilty of many things, but my hunch is that what got her in hot water with Blue stems from her relationship with Malcom and the birth of Rumple. And that may also have influenced her opinion and rules regarding interactions with humans (Becoming big in their presence, such as Tink did with Regina) or having relationships (with humans or anyone else, as seen with Dreamy and Nova).