Wild Magic — Angus Wells

When the First Gods created all things, they brought forth two lesser gods, Tharn and Balatur, to walk upon the new world. But greed and power twisted their minds and turned their ambition into madness. And so the First Gods condemned them to eternal sleep in order to preserve creation.

Now, the exiled prince Calandryll, the mercenary Bracht, and the warrior woman Katya pursue Rhythamun, a powerful wizard who would wake one of the mad gods and provoke apocalypse. He carries with him the Arcanum, an ancient book of power that--simply by virtue of having been discovered--already stirs the god from his slumber.

But Calandryll and his companions are chased by another vengeful mage, whose dark magics have created Cennaire, an undead murderess, to thwart their efforts. And as they face the perils of civil war, magical assaults, and the ever-present threat of Cennaire's treachery to reach Rhythamun before he wakes the god, they live with the knowledge that the fate of the world rests solely in their hands.