User blog comment:Roranoa zoro/Eternal Flame,FT's foundin' members,Acnologia's DSE/@comment-10425110-20130714150934/@comment-7418318-20130717085911

I just watched "Let's hold hands" again and noticed that before using it's roar Acnologia draws in some blue swirls.

So it seems to posses Sky Dragon Slayer magic or something similar that allows it to "eat air", though we still have no idea whether this is it's original element or an absorbed one.