User blog comment:Omega natsu2/Chapter 387: Tartarus Arc, Part 4: Father and Son, Predictions./@comment-117.195.63.129-20140603064413

Hopefully, Part 4 ends with Gray gaining Ice Devil Slaying Magic (temporarily or permanently). And E.N.D. making an appearance. Then we could have him curb-stomp Fairy Tail until Gray activates Demon Force and somehow defeats him. Would be disappointing if Natsu was the one to defeat final boss again. Though, from the look of things, Lumen Histoire might have something to do with E.N.D.'s defeat.