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Warning: This story contains major spoilers from Sundays episode ofOnce Upon a Time.
Read at your own risk!

Credit: ABC/Jack Rowand
It appears we thought we had taken care of that, but it turns out that was not true.
[Theyre] extremely worried.
Theyre not the only ones dealing with fear about Emmas well-being.
She always saw herself getting killed, so everyones going to band together to really prevent that from happening.
Its really about strategic planning.
How and when is this going to happen?
I dont think any of us had really contemplated its origins until this storyline was interwoven.
It does kind of give you thatOh shfeeling.
She is, by far, the most powerful force of evil weve ever encountered, Parrilla says.
She is way more powerful [than past villains], Kitsis concurs.
Also, shes Rumples mother, so theres an emotional connection.
The Black Fairy is almost a different level because she is almost no longer human; shes part fairy.
Shes the only fairy thats fallen from fairyland.
In a lot of ways, we look at her as the devil, in a sense.
It means that weve reached the end of the very first book, Kitsis says.
At a certain point, people say, When are they going to get their happy endings?
Interjects EP Adam Horowitz: Completed is a loaded term.
Were excited if we get an opportunity, and a season 7, to show everyone that.
Suffice it to say, the end being nigh doesnt sit well with our heroes.
Everyones a bit baffled by the whole concept because we dont really know what that means, Parrilla says.
And us actors dont really know what that means.
But the prospect of a true happy ending is not necessarily scary to everyone in Storybrooke.
Something Snow has been contemplating this entire season is a return to normalcy, Goodwin says.
I think it would do her some good.
Hence, Snow doesnt have any fear in terms of what this could mean.
Hes so wrapped up in the fact that this Final Battle is imminent, Dallas says.
I dont think hes actually really thought about that or let that sink in.
Ultimately, though, its Emma who the pressure is on as the end nears.
Emma is going to go through every emotion that you would, Kitsis says.
The final battle has been this threat thats loomed over us for six seasons now, Morrison says.
Theyre like, What does that mean, the end of the book?
Does the end of the book mean a happy ending?
Does the end of the book mean she dies?'
Well find out whenOnce Upon a Timeairs Sunday at 8 p.m.