The Rancid Tusk is a demon from the Forest of Rot, one of the hell planes of Tenaronus. This monstrous beast resembles a corrupted pachyderm, with multiple tusks, some twisting grotesquely back into its own skull. Its back is covered in bulbous mushrooms that can burst like pimples, releasing parasitic mushroom tadpoles. These parasites infect other creatures, allowing the Rancid Tusk to mutate and control them.

A shapechanger by nature, the Rancid Tusk can transform into a perfect copy of any beast it has infected. Its sole purpose is to sow chaos and spread infection, sending the essence of its victims back to the Forest of Rot. The demon's appearance and abilities make it a terrifying force of corruption, seeking to dominate and mutate all life it encounters.