After an especially violent battle, Baal enjoyed celebrating with his Brothers by holding a disgusting feast of blood, human flesh, and other Hellish delights. The Bestia Acerbus are the descendants of doglike creatures that lived by feeding upon the remains of Baal's nightmarish feasts. The variety of vile substances that the creatures consumed, along with their close proximity to the Lord of Destruction, twisted and warped the viscera of these Hounds of Hell. This diabolic species is capable of spitting up a variety of caustic fluids and projecting them a considerable distance. Packs of these terrors are especially devastating, as their bile has been known to eat through the strongest of armor and poison the most hearty men.

Great care must be taken when within the lair of these Bestia. Their venom retains its potency for a considerable amount of time and puddles of it may be found everywhere. When killed, the beast's inner toxins eat through the now-dead flesh, leaving a dangerous trap for those foolish enough to tread upon the corpse.