Purple worm

A constant threat to subterranean explorers, the purple worm burrows through the earth in search of prey. The worm is sensitive to minute vibrations in the earth, and can sense prey at a range of 60 feet. Adult purple worms as large as 8-9 feet in diameter and 140-150 feet long have been reliably reported.

The worm attacks by biting, and has been known to swallow victims up to 8 feet tall and 6 feet wide whole, killing them in a matter of minutes. This worm has a stinger on its tail, which can kill a victim instantly.

The purple worm is solitary and seeks a companion only to mate. The moment a new worm hatches, it burrows into the ground, never to be seen by its siblings again. As the worm tunnels, it consumes vast amounts of material that are excreted when it returns to its lair. Among the discharged substances, precious metals and gems can occasionally be found.

Note: Purple worms originally appeared in this form in the 2nd Edition Monstrous Manual for the AD&D game from TSR. Their use here is for the purposes of providing context for the campaign only.