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. 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. 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.

In this thrilling sequel to The Mirror Empire, Kameron Hurley transports us back to a land of blood mages, sentient plants, and warfare on a scale that spans worlds. Every two thousand years, parallel dimensions collide on the world called Raisa, bringing a tide of death and destruction to all worlds but one. Multiple worlds battle their dopplegangers for dominance, and those who survive must contend with friends and enemies newly imbued with violent powers. Now the pacifist country of Dhai's only hope for survival lies in the hands of an illegitimate ruler and a scullery maid with a powerful – but unpredictable –magic. As their dopplegangers spread across the world like a disease, a former ally takes up her Empress’s sword again to unseat her, and two enslaved scholars begin a treacherous journey home with a long-lost secret that they hope is the key to the other worlds' undoing. But when the enemy shares your own face, who can be trusted?

The bloodsoaked concluding volume of Kameron Hurley’s epic fantasy, the Worldbreaker Saga, is unleashed. The Dhai nation has broken apart under the onslaught of the Tai Kao, invaders from a parallel world. With the Dhai in retreat, Kirana, leader of the Tai Kao, establishes a base in Oma’s temple and instructs her astrologers to discover how they can use the ancient holy place to close the way between worlds. With all the connected worlds ravaged by war and Oma failing, only one world can survive. Who will be sacrificed, and what will the desperate people of these worlds do to protect themselves?