Dark Waters — Robert S. Stone

Once, magic ran rampant throughout the countries of Chaldus and Yndot But a brutal war between them turned the tide. To free the world from the dark forces of destruction, the mages performed a ritual that rid the world of magic--a ritual that could be undone...

THE CHRONICLES OF THE UNBINDING

Through the torture and murder of former Chaldean ministers, a Yndrian assassin has learned the spell that will plunge the world back into chaos. But he is being pursued by a man driven by something other than the threat of the Unbinding. Brandt Karrelian's motive is far more personal: revenge. A lifelong friend lies crippled by the killer's hand. And Brandt's fury will not be sated until everything it touches is destroyed, including the secrets of his own notorious past...and the assassin who has made him remember every one of them.