User blog comment:IamJakuhoRaikoben/Chapter 495: I'm Hungry As Hell, Review./@comment-96.240.41.48-20160726041050/@comment-7418318-20160726105547

If they turn up, I hope we'll get a good excuse explanation as to where they've been all this time and only now join the fray.

Getting reinforments, magical items of great power or performing some kind of magical ritual that'll help greatly would be a nice reason.

Might even be that they've been rebuilding and charching Etherion. Of course they'd have to fire a lower than usual yield seeing as how they wouldn't want to wipe their own country out, but that's also convenient for the story, since it'd still wipe the small-fry out, but leave the Shields standing.