Curse of the Shadowmage

An unlikely pair of heroes matches wits against the revived legacy of the Shadowking in this classic Harpers novel Long ago, the shadow magic transformed an ancient wizard into a being of utter evil: the Shadowking. Now legendary Harper agent Caledan Caldorien—heir to the shadow magic—has mysteriously vanished. As the Realms whisper of his disappearance, the Harpers spring into action. Fearing that Caledan is transforming into the new Shadowking, they mount a mission to not only find him but to destroy him entirely.
Renegade Harper Mari Al-maren and the mage Morhion must embark on a desperate quest to rescue Caledan—and to stop him before a Shadowking stalks the Realms once more.
Curse of the Shadowmage is the eleventh book in a series of loosely-connected novels about the Harpers.