The Knife's Edge: The Ronin Saga - Matthew Wolf

Elemental magic. Immortal legends. The Ronin have returned... Eighteen-year-old Gray has a terrible power that all the world fears. A reborn legend of old, he wields the forsaken power of wind. As the world of Daerval crumbles, Gray is their only hope. Labeled as a harbinger of chaos, Gray must lead the last citizens of Daerval to a new world, fleeing the death known as the Kagé, or shadow. With a host of unlikely companions, Gray must save those who fear him, before the Kagé destroy the last vestiges of a dying world.