User blog comment:Miskos3/Fairy Tail 535: The Greatest Power, Review/@comment-5303512-20170514221549/@comment-5303512-20170515200621

That was an entirely new spell that Zeref didn't use before, and Mavis said that with FH, The user could use Etherion as many times as he wants to, she didn't say that they could increase its destructive power