Board Thread:Spoilers!/@comment-6175354-20140420035659/@comment-24386552-20140422185428

It would be interesting if Regina, Snow, and Charming cast the curse, but the price was, that they didn't remember doing it. Glinda might have done it, to prevent Zelena from going back in time and changing things. Similar to Final Fantasy Dimensions. The crystals sensed an evil presence, trying to take them, so they split the world into two. And Zelena happened to have a talisman that allowed her to keep her memories.