Tetrarch

The Aachim have invaded with an irresistible fleet of battle constructs—and their embittered leader, Vithis, demands half the world. Santhenar, on its knees after a hundred years of war against the lyrinx, is in no position to resist. But even if the Council of Scrutators agrees to Vithis's demands, can anything satisfy his thirst for vengeance? Tiaan, now feeling utterly betrayed, is hunted through the abandoned city of Tirthrax by an implacable Nish, who burns at her previous rejection of his advances, and blames her for the invasion. The future of the world rests in the hands of three flawed people. Tiaan, whose geomancy holds the key to the power that can save or destroy humanity. Nish, who has sworn to redeem himself by bringing her to justice. And beautiful, brave, haunted Irisis, whose great talents are hidden even from herself.