Son of Truth by Morgan L. Busse

Description:

The war in the north is over, but the war for all the Lands has just begun. As the Shadonae solidify their hold on the city of Thyra, Rowen Mar, the last Eldaran and savior of the White City, awakens to find herself hunted by those she has saved.

Meanwhile, the assassin Caleb Tala finds himself in the presence of the Word. The time of reckoning has come, and he must pay the price for all the lives he has taken. But in his moment of judgment, Caleb is given a second chance to change his life.

These two hold the power to save the Lands from the Shadonae. One must escape slavery, and one must choose to forsake everything before the world is consumed in darkness.