Board Thread:Spoilers!/@comment-27061694-20151010095949/@comment-5899967-20151013133504

LadyJusticeee wrote: What if Nimue cast a curse?

I think that she is the person who turned Merlin into a tree, and if someone leaves Strybrooke he is becaming a tree

It's probably just because they wanted to give a theme to this curse, not because Nimue cast it.