An elderly Shaman of Tribe Threefinger, Coldtooth (so known due to the metal replacements to many of his teeth) is a trusted advisor to Zibrust and his brother Wretch "Shadowborn", who he teaches to harness his magic.
In the events of A Gathering Storm, Coldtooth acts as a mentor to Wretch and a more cautious and shrewd advisor to Zibrust, as well as acting as translator between the party and the Greenskins. In the events of the duel at Stubborn Rock he stands up to Hervok when he attempts to steal the Threefinger Spear, and is struck down by the Thunderhammer for his efforts, killing him instantly.