[quote=@j8cob] Gray only hit Mard Geer with Devil Slaying magic once. The other ice attacks were his standard Ice Make. [url=http://www.mangapanda.com/fairy-tail/410/14]Source 1[/url] [url=http://www.mangapanda.com/fairy-tail/411/14]Source 2[/url] [url=http://www.mangapanda.com/fairy-tail/412/2]Result[/url] First two sources are precisely one chapter's worth of pages apart. Devil Slayers completely and utterly annihilate Demons. Revan would get mad wrecked by a direct hit. [/quote] Except Revan isn't actually a demon, he has demon blood. We already determined that he takes less damage than normal demons, AND that he's powerful enough to withstand a direct hit from Devil Slayer magic (which does not just arbitrarily obliterate demons, but just deals more damage specifically to them like Dragon Slayer does to Dragons).