User blog comment:Miskos3/Fairy Tail 528: Dragon of Magic, Review/@comment-24039234-20170325174042/@comment-7418318-20170325175149

I don't think we were supposed to be surprised that Jellal couldn't hurt Acnologia. That one was pretty much a given (unless he loses a Dragon's immunity to anything other than DS magic in his Human shape). The thing that was supposed to surprise us is that Acno can eat all kinds of (at least non-DS) magic instead of "only" being immune to it.