Sometimes called Gloom Hounds or Hounds of Hades, these three-headed creatures are bred to be the ultimate guardians. Very few creatures can successfully sneak past a cerebus hound that guards a doorway or treasure.
Cerberus hounds take pride in sniffing out and devouring trespassers. Once they have been set to guard something, they never tire of their charge, even should hundreds of years pass without incident. Most hounds keep piles of their victims' bones as beloved trophies to gnaw on. Although the hound does require sleep, it rarely succumbs to the urge, and only one of its heads sleeps at any given time.