User blog comment:IamJakuhoRaikoben/Chapter 415: And It Shall Become Your Will To Live, Review./@comment-24277053-20150110233547/@comment-9595671-20150111090223

Yep, Acnologia's pretty much glued in the final boss spot.

Acnologia's killed every dragon including the parents of the Dragon Slayers themselves, he was once a dragon slayer and now he's a power hungry dragon that wants to destroy, its time the current Dragon Slayers give him his karma and slay his sorry scaled butt for good.