Giant Burrowing Worm

These colossal segmented worms bore endlessly through earth and stone, bodies as thick as a wagon ringed with bands of grinding muscle. A vast circular maw opens into rings of inward-curving teeth, and a keen sense of vibration guides the blind hunter toward anything that moves. The largest violet-hued tunnelers can swallow a standing warrior whole and bear a venomous stinger on the tail. A forest-dwelling caterpillar variant fights with acid-slick jaws and poison bristles, while a smaller pack-hunting type lunges from hidden burrows and chews through armor to reach the flesh beneath. An aquatic cousin lurks in shallow muck. As they tunnel they swallow rock, later excreting gems and raw ore in their wake.