User blog comment:IamJakuhoRaikoben/Chapter 288: Wendy vs. Chelia, Review./@comment-2214433-20120622184447/@comment-1896886-20120622185359

Who knows - remember that all GH was kinda crazy about Zeref... All members was gathered for that Ultimate Magic World concept - and all was based on Zeref's followers book (from which came Nemezis and that Resurrection Key idea).