The Crimson Sword by Eldon Thompson
Alson's king has been assassinated, its capital besieged by a malevolent wizard. The chaos and terror now sweeping the land have come to the remote village of Diln -- sending young Jarom far from his home to seek aid against the nefarious usurper. But a mysterious council has decreed Jarom must find one of the mythical Swords of Asahiel -- the divine talismans the elven avatars used to forge the earth -- in order to save a quarrelsome, fledgling humanity. For a Demon Queen has awakened from the abyss -- and humankind is about to discover its powerlessness in the face of the ancient terrors of the world."
Mass market, a nice copy!