Burning Bright - The Lost Gods, #2

Nine gods ruled the world, until the ultimate betrayal resulted in their destruction. Now, the world is dying and only by restoring the Lost Gods can it be saved. In the land of Pozhar, the people fear the return of Zhar Ptitsa, the god of souls and rebirth who nearly destroyed them nine hundred years ago in a terrible rage. To prevent his rebirth, the people hunt down and sacrifice Vessels, those born with a piece of Zhar Ptitsa's soul within them.
The Sacred Texts say that one thousand such Vessels will be born and all must be sacrificed to destroy Zhar Ptitsa once and for all. Now, only two pieces remain in the bodies of two thieves who will not go to the Flames without a fight.