The Malaugryms--sometimes known as the shadowmasters--are immortal shapeshifters from the Plane of Shadow. Despite the similarity in name, the shadowmasters have nothing to do with the Shadowmasters of Telflamm, a thieves' guild strongly tied to the church of Mask. Intent on invading Faerun, the Malaugryms are hindered by their inability to master interplanar magic, trapping them in the Castle of Shadows on their home plane. Only the most powerful spellcasters of the race can master spells that send the Malaugryms to the Material Plane to wreak havoc.