Fiendwurm

In the Dungeons & Dragons fantasy role-playing game, the fiendwurm is a magical beast. They are monstrous worms which have portals to the Abyss in their bellies.

Ecology
Fiendwurms are the result of an ordinary earthworm having demonic magic cast upon it. In addition to greatly altering and mutating their physical form, this also creates the portal to the Abyss mentioned above in their stomach. This portal causes them enormous pain, and the only way to relieve this is by eating. Because of this the fiendwurm has a violent nature and attempts to swallow any creature it encounters, and unfortunately, as one might expect, anything swallowed by it goes straight through the portal to the Abyss.

Environment
Fiendwurms can be found in deserts, plains, and underground.

Typical physical characteristics
Fiendwurms have legless, worm's bodies. They are fairly huge, about the size of a frost worm or purple worm. On their underside, they are colored a peach, blood-like pink. On the topside, they are a sickly purple. Though they were supposedly once earthworms, the head of the fiendwurm is completely unlike an earthworm's eyeless, tubular, all-mouth, head, and instead is almost draconic. They have a pair of horns which point back and up, as well as a few spikes around the lower mouth. Their tongues are long and purple.

Creative origins
Wizards of the Coast designer and developer Ed Bonny, who was working on thinking of creatures for the Monster Manual II, humorously claims to have imagined the fiendwurm while eating dinner in Manhattan with friends. Supposedly the idea it just struck him while eating, and he scrawled the concept on paper tablecloth, and it eventually blossomed into the fiendwurm.

Fiendwurms appeared in the 3rd edition Monster Manual II.