User blog comment:IamJakuhoRaikoben/Chapter 442: The Law of Space, Review./@comment-4933386-20150630134148/@comment-7418318-20150701090304

Face for sure, that's a last-resort weapon.

With Alvarez having the advantage in mages, making Ishgal a magic-free zone would level the playing-field.

Etherion would really depend on where they hit the enemy. If they can spot them far enough off the coast, it could eradicate the invading fleet before the area of effect of Etherion damages Ishgal soil. But even if they have to burn a piece of their own continent, it's probably still better than being completely overrun.