I’ve got a theory. The dark realm is going to possibly be a version of Halloween town (so we’ll get OUAT’s version of a nightmare before Christmas with Jack Skellington) and also residing in the dark realm will be the Boogeyman who could possibly be the villain for Season 7.
My money is on Doctor Facilier though who plans to bring his “friends on the other side” over to Storybrooke.
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All magic comes with a price!
Keeper of Felix