Cave Worms

The Cave Worm of Mars is truely a disgusting creature. This absolutely featureless worm would wait in the dark mine, giving off a light glow to attract prey. Once it spots prey, it shoots off spikes or tries to grab the victim with its tentacles to melt it with acid. However, they are pretty harmless if the adventurer is careful enough and kills them from afar. Projectile weapons work best against it.

As mentioned, found in dark caves.