User blog comment:JohnnyN64/Lisanna/@comment-5303512-20140702155752

I don't think she will be useful, unless it is for a NaLi moment.

My theory about Lisanna is if E.N.D. went to the one place where magic is finite and not self-sustaining, Edolas. He would go there be able to recuperate and would use Lisanna as a vessel with a portion of his essence in order pass through the Anima (something similar to the Diablo 3 story line with Leah being a vessel for Diablo). That would explain why Lisanna had significant screen time this Arc and moments with Natsu. Also, I think when Carla mentioned Edolas could be a clue as well. If this theory is correct, then it would be a way for E.N.D. to be reconstituted without having magic eliminated.