User blog comment:IamJakuhoRaikoben/Chapter 444: Emperor Spriggan, Review./@comment-4829046-20150714093139/@comment-7418318-20150714203104

Ending scenario:

All of FT fights Zeref (while Natsu is detained somewhere else), but they all die. The last survivor is Lucy, but she sacrifices her life for a very powerful attack that almost kills Zeref.

Zeref is so impressed that he turns her into E.L.H (okay that sounds stupid, but I mean a Demon the equal of E.N.D.). Then the Demonized Lucy and Natsu together manage to kill Zeref and Acnologia, which starts their evil reign over all of mankind. >:)