User blog comment:Miskos3/Fairy Tail 528: Dragon of Magic, Review/@comment-5672982-20170325175052

So Acnologia is pretty much a dragon of pure nothingness, as in, no magic hurts him, and he can consume any type of magic out of existence, and power himself up in the process.

Basically, yeah, it was pretty much ethernano dragon slayer magic. I'd say its a fitting "element", the Black Dragon of Nothingness, the dragon with no element that devours all magic like a black hole. Fitting seeing he's the Black Dragon of the Apocalypse.

Power of the Voidhttp://tvtropes.org/pmwiki/pmwiki.php/Main/PowerOfTheVoidPower of the Void