289 pages ; 22 cm.
The Numina series ; 
Holmberg, Charlie N., 1988- Numina series ; 3.
"Sandis has finally freed herself from her master and his plans to use her as a vessel for the ancient beast Kolosos. But her master has found a new, impossible vessel: Sandis's brother, Anon--a brother she long thought dead. Kolosos is ancient, massive, and seemingly unbeatable. Fortunately, Sandis has her own monster--an ethereal fire horse that she can summon at will. In addition, she and Rone may have discovered the secret to defeating Kolosos: ancient lore that details the creation of magic. It could be the key to victory and the key to saving Anon."--Provided by publisher.
Siege and sacrifice