Death cults can be found on many Imperial worlds; many are Chaos-spawned and lend servitude only to Khorne the Blood God. Others are religiously, fanatically dedicated to the Imperial creed and offer those they slay to the Emperor, a payment of the blood-debt all mankind owes him.

Death Cult Assassins may be added to your Daemonhunters/Witch Hunters army as an Elites choice.