A thunder beast is a bloated, pig-like creature that roams in a herd across the layers of the Abyss. Its name comes from its rumbling bellow, intestinal sounds, and offensive breath. A thunder beast subsists on both vegetation and ooze from which unwholesome growths spring, and thunder beasts feed many of the other creatures likewise inhabiting the place. A thunder beast's flesh is rank, fibrous, and disgusting. An adult thunder beast attacks by biting or by a trampling charge. A frightened or angry thunder beast will begin bellowing, and in combat a thunder beast will breath on its opponent, building a thick cloud. A thunder beast is like a pig or hippo in form but with longer legs, of which it has six. Its body is quite round and appears swollen. Its head is low-set and cylindrical with fan-like ears and a huge mouth. It has small, beady eyes and no nostrils. The tail is broad, thick, flattish and fairly short. Its color ranges from yellow brown to olive, all with darker mottling and warty growths.