Scattered Suns - The Saga of Seven Suns, Book 4

The war between the alien hydrogues and the faeros ravages the Ildiran Empire, dividing humanity. New Mage-Imperator Jora'h must quash the rebellion launched by his mad brother before the hydrogues destroy what is left of the empire. He sends his beloved half-human daughter on a desperate mission to make peace with the hydrogues.