User blog comment:Miskos3/Fairy Tail Chapter 506: The Broken Bond, Review/@comment-188.143.64.132-20161018162154/@comment-23853100-20161018164018

Well Mashima can just do whatever he wants anyway. If he feels like it, he can change Erza into an Etherious like Natsu too. He just have to say that Irene went to Alvarez to copy Zeref's demon creation which she used on Erza.