According to the synopsis for 5×20, Hades is going to agree to take their names off of the tombstones to get Zelena back. “Hades turns to the heroes to ask for help with getting Zelena back from Rumplestiltskin and Peter Pan. In return, he offers to take all their names off their tombstones. However, when Hook is still unable to leave, he and Emma must journey into the depths of the Underworld.” So, it seems like Emma is going to try splitting her heart again, only for it to fail (again), so she’ll have to try some other way to get her Killy Poo back.
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy