The purple worm is the most common and infamous of the cave worms, a much-feared monster wandering the twisting tunnels of the Darklands that is capable of carving out entire cave systems. Tunnels bored by a purple worm don't always last long after these creature's passage, and areas where they nest are maddening mazes of passageways that lead nowhere, yet navigating the labyrinth to find the worm's central nest often yields amazing treasures left behind by the worm's prior victims.