Board Thread:Spoilers!/@comment-26198810-20150907034213/@comment-25926288-20150910204615

http://thatravenclawbitch.tumblr.com/post/128790264669/in-that-new-pic-of-emma-rumple-theres-something

So instead of making a new thread, I will guess and say that Emma starts out in the Enchanted Forest, seeing that the Dark One's Vault is seen there.

I guess when major transactions or new things happen the Dark One goes back to the Well. That means that the first Dark One had to have been released by someone. Emma might have been released from the well by someone as well. This would also explain why she teleported away, but not why she left the dagger behind.