Board Thread:General Discussion/@comment-25926288-20150928010102/@comment-26184894-20151001092947

8Rob wrote: Emma cursed them

And it seems she is pretty sure no one can break her curse.

But we already know Regina is capable of because she broke Snow's curse

Unless.... Regina went back to evil in Camelot and lost her light magic and that's why Emma is sure Regina won't be able to break it I don't think Emma cast the dark curse because all of the people she most likely would love most are still alive. Regina or the charmings could probably still break it tho but the plot would be hurt by that.