The Coming of Wisdom — Dave Duncan

SEVEN AGAINST SORCERY

The Goddess had rescued Wallie Smith from certain death, endowed him with a magnificent new body, and gifted him with the legendary Sapphire Sword of Chioxin. She asked only one service in return...

So Wallie became the Goddess' champion--and promptly found himself on the losing side in a battle against magics far beyond any the priests of the Goddess could hope to summon. After eons of exile, sorcerers walked the World again, claiming lands and souls for their Fire God.

Wallie quickly found that swords were no match for spells--and how could mere mortals prevail against the powers of magic?