In this final volume of the Horizon War Trilogy, a desperate war rages in the Horizon Realms, the mystic dimensions that surround Earth. The mages of both the Nine Traditions and the Technocracy are under attack by a mysterious willworker who calls himself Heylel Teomin, the Ascension Warrior. His challenge: Join me or be destroyed Only a small band of unlikely allies stands against him. If they fail, humanity is doomed.