User blog comment:IamJakuhoRaikoben/Chapter 459 & 460: Weakness & The Alighted Pegasus, Review./@comment-203.111.234.105-20151101162256/@comment-1776824-20151102015845

Yeah, but Gray was using Ice-Make. It's been shown that even Dragon Slayer fire can't melt Devil Slaying ice, so there's that to think about.