Andre Norton Warlock of the Witch World Paperback Book

When Kemoc, brother of witches and son of an Earthman, rode out with his weird allies to pursue the conquest of the lost lands of the East, it was to prove the test of his whole purpose for existence. For there was one among that mixed cavalcade of warriors who was not of themwhose form concealed a different and far more alien menace than any they expected to encounter. That alien in disguise bore Kemoc a very special enmity. It would take Kemoc the very limit of his inborn warlock talents just to survive the rigors of a war against unknown monsters in an unconquered landlet alone to meet the unsuspected onslaught that rode at his very side. | Andre Norton Warlock of the Witch World Paperback Book