The Curse of the Mistwraith

It began with a Mistwraith that smothered all the world in fog and dampness, followed by a war that upended order and overthrew the rule of the High Kings. Now, two rival brothers must unite to clear the skies of the deadly Mistwraith if their world is to survive.
Volume one of The Wars of Light and Shadow. Immediate sequels are Ships of Merior and Warhost of Vastmark.