User blog comment:Yuri Rozu/Fairy Tail Chapter 502 Mavis and Zera/@comment-172.56.16.16-20160920235051/@comment-99.65.100.226-20160921070105

I find it highly unlikely for it to be a mere power boost. Mainly because Porlyusica said that it's actually something far worse than what she had previously diagnosed it to be. Which, considering her previous diagnosis, has to be extremely bad.