Caliban and Other Tales — Robert Devereaux

His mother was a sorceress, and his master is-a powerful magician. His home is a dark, wild island of enchantment, spells . . . and evil. He is Caliban. Is he human, spirit or demon? Who can say? All he knows is that he burns with a lust for revenge and his growing powers may soon make it possible. But even he cannot predict the nightmarish shape his vengeance will take . . . or the tempest of terror it will unleash.