A medium-sized breed of Worm with a particularly high point on its head and green glowing eyes that only function well in the dark, so it spends most of its time living underground and only surfacing at night. Its shell is hard and gray like stone, so it is often used for mining work because it will not be crushed in a collapse.
Named for the fact that its shell looks like rock. Its name in Japanese is
|Monster Rancher 1||"This one dwells between the rocks. It can't see well."|
|Monster Rancher 2||"It has beautiful eyes, but they do not work well in the light."|
- To obtain a Rock Worm in Monster Rancher 1, combine a Worm with any Golem.
- To obtain a Rock Worm in Monster Rancher 2, use