Board Thread:Character Discussion/@comment-25355646-20150302022703/@comment-25926288-20150508113124

Lady Regina wrote: O yeah that's true, but maybe she used the unicorn to see her childs future, or was the unicorn Snow and Charming found the only one who could do that? All unicorns.

We don't know what the base dark curse actually does. We assume that the base dark curse can grant the happy ending or the heart's deepest desire. We don't know what Rumple did to it, if any, becasue we learn that the Dark Curse can transport across realms, stop the concept time (create a realm outside of time like cursed Storybrooke and the Fictional 1920's), freeze multiple realms, bring magic, be changed, etc.

Example: Peter Pan wasn't going to use the Dark Curse to travel realms because what he wanted was to delete memories, create a timeless pocket with magic. SO, it pretty much grants the person's greatest desire. It can travel to any realm, it's just that everyone that uses it wants to travel to the LWM.

You can replicate it with multiple items, but that is quite hard. You can traverse realms with certain items, grant your wish with certain items, forget stuff with certain items, (I don't know how you create a timeless realm, but hey), etc.