Queen of Sorcery cover illustration by Geoff Taylor

Queen of Sorcery by David Eddings
The second book in the Belgariad series 1981
Legends told of how the evil God Torak had coveted the power of the Orb of Aldur, until defeated in a final battle. But the prophecy spoke of a time when he would awake and again seek dominance over the world. Now the Orb has been stolen by a priest of Torak, and that time is at hand.