This huge beast has a hippo-like head with pointed pig-like ears. It has a large, wide mouth with small upright tusks jutting from its lower jaw. Its long body is thick and hunched. Six powerful legs aid the creature in locomotion.
Every 1d4 rounds as a swift action, a thunder beast can exhale a cloud of poisonous gas in a 20-foot cone. Living creatures in the area must succeed on a DC 18 Fortitude save or sickened every round they remain in the area and for one round after leaving the area. The save DC is Constitution-based. The cloud lasts 1d4 rounds before dispersing. A strong wind (21+ mph) disperses the cloud in 1 round.
Environment The Abyss
Organization herd (5-20; 50% noncombatant young)
Thunder beasts are herd animals that spend their time roaming the uncountable layers of the Abyss sustaining themselves on a diet of rotted plants, minor demons, and other inconsequential life forms.
If angry or frightened, a thunder beast bellows with a low, rumbling tone. If the object of their concern does not immediately withdraw, they then breathe their foul breath and attack with their vicious bite.
A typical thunder beast is about 20 feet long. It is yellow-brown, ochre, or olive in color, mottled dark brown or black.
Thunder Beast from the Tome of Horrors Complete, Copyright 2011, Necromancer Games, Inc., published and distributed by Frog God Games; Author Scott Greene, based on original material by Gary Gygax.