User blog comment:LegerPrime/H.E.A.T. Human Etherious Acnologia Tartaros/@comment-121.54.54.140-20150821130142

One of the chapters in the manga (spoiler), is that Face was briefly activated. Then Acnologia was severely weakened, up to the point Igneel defeated him, right? Which can be stated that he (Acnologia) uses Magic for his dragon form...