Havemercy

When their enemies, the Ke-Han, come up with an ingenious scheme to conquer Volstov, a country protected by magicians, the metal dragons they have created, and the men who ride them, an unlikely quartet of heroes--exiled magician Margrave Royston, country boy Hal, unpredictable airman Rook, and Thom, a grad student--is forced to band together to save the kingdom. 30,000 first printing.