The Deathlords turn certain wraiths into barghests, also called bloodhounds. Barghests are wraiths who have been Moliated into monstrous shapes and “lobotomised” by the grafting of a specially prepared muzzle of Stygian iron to their Corpus. The wraith who holds the corresponding “whistle” for a brace of barghests controls their actions. Barghests are animalistic and feral, but have extremely keen senses and are completely obedient to their controller. They are used as hunters and assassins by the Hierarchy. Braces of barghests search the Shadowlands for wraiths (or other beings) who bear significant amounts of Oblivion taint and destroy them.
In Yellow Springs, similar creatures called kuei-go are trained by a special class of wraith, though their muzzle is made of jade rather than iron. Kuei-go are most numerous in the Bad Dog Village on the road to Feng-tu.