Board Thread:General Discussion/@comment-26715865-20151101163615/@comment-25926288-20151101163955

We don't know but we may perhaps find out.

It could just be a magical power Rumple possessed, or it could be some of the Darkness that belonged to a former DO.

We saw in DreamCatcher that Emma could use the swilry Darkness in a spell, so, perhaps it is the same magic power that was guarding the Vault.

Or it's just something we have yet to discover.