The time has come for Billy Bane to finally meet his singular destiny and confront Ahriman, the primordial god of darkness and chaos. Ahriman destroys entire worlds so they can rise again stronger than before, and he has decided our world is next. Billy and his two best friends are the only ones standing in his way.

Drawing on the unique abilities of all their ancient bloodlines, Billy comes up with a daring plan to beat Ahriman at his own game. But first, he must call in a couple of favors. With the help of his friends, some warrior monks, a powerful demon, and a few creatures from the darkest depths of the earth, Billy takes the fight to Ahriman with nothing less than the fate of the world at stake.