Board Thread:Spoilers!/@comment-24674051-20160222174831/@comment-6175354-20160223162056

NickyHelp wrote: You're still wrong. It is Emma who wanted to use it to rid of the darkness, not the former dark ones. They with Nimue had other plans, as it was revealed in the flashback of "Broken Heart".

Have forgotten when Killian challenged Rumple to a dual, he struck the former dark one and got some of his blood? his blood was a key to opening a gateway to underworld and that is how the dark ones got to Storybrooke.

So clearly it makes sense the whole time. That's just what all the dark ones wanted. Follow carefully and harder if you watch it again. The Darkness is the essence of all the previous Dark Ones.

When Emma stole Merlin's immortality to turn Hook into a Dark One, she made it impossible to destroy the Darkness without resurrecting the previous Dark Ones. Honestly, it was probably the only reason she was to fool Nimue, for so long.