User blog comment:CNBA3/Tartarus Arc Parts Theory!/@comment-201.160.219.228-20141013034219/@comment-201.160.219.228-20141013041117

But even Acnologia isn't the "main villain of the entire series". One way or the other, Acnologia must die in this arc. He may have gotten away in the Tenrou Island Arc, but this must be the Arc where he must die, even if Igneel would die trying.