User blog comment:Yuri Rozu/Fairy Tail Chapter 502 Mavis and Zera/@comment-172.56.16.16-20160920235051/@comment-99.65.100.226-20160921071415

But honestly it was just a thought. Although I am beginning to think this is the case more and more, but hey I may be wrong about it. But yeah I think the tumor is indeed Etherious.