Rotworms

Rotworms are scavenging invertebrates that typically congregate in swampy areas. They appear in Ultima VI and in the Ultima Underworld series.

Description
Rotworms usually feed on decaying material, although they are quick to attack when they sense living flesh nearby. While these pests are fearful of fire and generally easy to dispatch with a single well-placed blow, large swarms of them have been known to overcome ill-prepared or injured warriors. It is also important to differentiate between rotworms and their venomous cousins, bloodworms, as the later is a measurably more formidable foe and in possession a poisonous bite.

Despite their loathsome feeding habits, rotworms are edible, and a relatively palatable stew may be prepared from their meat using port and mushrooms. During their imprisonment in the Abyss, the Avatar could prepare such a dish for the troll, Sethar Strongarm, who would in turn reward the hero with a set of dragon's scales.