User blog comment:IamJakuhoRaikoben/Chapter 377 & 378: Imperial Wrath of the Heavenly Dragon & With Friends, Always, Review./@comment-2214433-20140330153158/@comment-24467372-20140330163828

The Gray one is probably a one-shot rather than an entire series...

That dude is one the #1 or #2 Ishgal God,calling it now.