User blog comment:FairyRaven/Fairy Tail Chapter 399: Wings of Despair, Review and Commentary/@comment-24066070-20140908130106/@comment-7418318-20140908131101

Acnologia and Face... I didn't put those two together yet.

Could it be that Acnologia came because he fealt threatened by the Faces?

In an extreme case his Dragon Transformation might even be undone by the activation of the Faces, returning him to a nurmal Human.... that'd be an interesting twist. Especially if Acnologia's lost power is then absorbed by E.N.D. and enables him to wake up.