The Dark Defiles (GollanczF.)

Ringil Eskiath, a reluctant hero viewed as a corrupt degenerate by the very people who demand his help, has traveled far in search of the Illwrack Changeling, a deathless human sorcerer-warrior raised by the bloodthirsty Aldrain, former rulers of the world. Separated from his companions-Egar the Dragonbane and Archeth-Ringil risks his soul to master a deadly magic that alone can challenge the might of the Changeling. While Archeth and the Dragonbane embark on a trail of blood and tears that ends up exposing long-buried secrets, Ringil finds himself tested as never before, with his life and all existence hanging in the balance.