User blog comment:Derax-Pagani/Fairy Tail Chapter 494: The Hill Extending Towards Tomorrow Review/@comment-6401212-20160719062926/@comment-5894890-20160719160600

Hmm I wouldn't be too sure, I think he's basically at his limit. Like how Lucy is with her celestial spirits (summoning/ keeping them summoned consumes magic power, as well exhausts her body).