On the eve of a recurring catastrophic event known to extinguish nations and reshape continents, a troubled orphan evades death and slavery to uncover her own bloody past--while a world goes to war with itself. In the frozen kingdom of Saiduan, invaders from another realm are decimating whole cities, leaving behind nothing but ash and ruin.

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As the dark star of the cataclysm rises, an illegitimate ruler is tasked with holding together a country fractured by civil war, a precocious young fighter is asked to betray his family and a half-Dhai general must choose between the eradication of her father's people or loyalty to her alien Empress.

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Through tense alliances and devastating betrayal, the Dhai and their allies attempt to hold against a seemingly unstoppable force as enemy nations prepare for a coming together of worlds as old as the universe itself. In the end, one world will rise--and many will perish.