The Shadow of the Sorcerer — Stan Nicholls

The foul sorcerer Avoch-Dar has slipped through his pursuers' grasp, taking the Book of Shadows with him. And once he has unlocked the book's mysteries, he will return to Delgarvo, invincible. No one but the mighty warrior Nightshade realises this danger. And with the book gone, he feels more powerless than ever. But the sorcerer has left behind his enchanted crystal. Could this be the key to his own destruction? Nightshade is determined to find out -- for the fate of all Delgarvo is at stake.