A strange purple metal with magical properties found under the use of the various humanoid races found in the Rage, Shadow, and Ash quest chain. According the An Siubhail Aireach he's seen the metal before in Eberron but no one from any other world seems to recognize it at all.
Apparently used to fight the 'Lords of Madness' or 'Daelkyr' in Eberron- its properties assist in fighting aberrations bypassing their natural defences to the weapon.
Byeshk weapons (value 204 GP) found so far: SixPaths -a gauntlet of Byeshk set in bone.