Celebrant. Son of No Man Series, #2

Cornered beasts fight more like demons than men. Tohmas Galanth has arrived in the north, outnumbered on every front. To survive his commitments to his besieged uncle, he must defeat the hordes, but their leader DoomDragon is no easy foe, and the battles are fought in steady retreat. Even after reaching his uncle, city walls and fortifications give only the illusion of safety; DoomDragon and his allies have been biding their time.
Now they will take the land as their own and drive Tohmas and Sol across the tundra. Morale of the dogged forces is further pressed by fights among the religious leaders, where Inac's followers plot a sinister take over. Where once balance was maintained, now domination is planned.  Fires and assassinations thrive among Tohmas' trapped army as the winter moves in.  Unless Tohmas turns the tide, the Galanth forces will not see spring.