Ravening Beetlebeast

Lurking on remote asteroids and lonely moons, the dreaded Beetlebeast stalks anything even remotely edible. These monsters will happily munch upon asteroid miners, algae, plastics, or anything else unfortunate to get caught. Beetlebeasts can survive in vacuum environments and are highly resistant to radiation, leading some specialists to surmise that they are the product of genetic engineering by some unknown alien race.
Beetlebeasts are powerful subterranean predators whose ironlike claws allow them to burrow through solid stone in search of prey. Beetlebeasts are tremendously strong, standing nearly 8 feet tall and over 5 feet wide. Muscles bulge beneath their exoskeletons and their powerful arms and legs all carry great claws. They have no necks to speak of, but the head features a powerful maw with 8-inch mandibles capable of biting through any hide, bone or steel and composites. Their eyes are mere blackened dots each the size of a small coin.
For all of their monstrous features, beetlebeasts are intelligent opponents. They lie in wait for passing prey, peeking through a crack they've made, until likely prey walks by. The rock devil then springs out upon its startled victim. When using this technique, opponents have a +4 modifier on their ST for Stealth checks. Other tactics involve planned cave-ins and dead-end tunnels and burrowing up underneath their chosen prey. Their burrowing rate varies from 4 meters per turn in solid stone to 6 meters per turn in soft earth.
AC: 16, HD: 8d6, THB: +8, Att: 3 claws 2d6, claw 2d6 and bite 3d6, St: 11+ (Survival and Stealth), MV: 6 (Burrow 4-6), SPC: Optional Movement (Burrowing), Dark Vision, Immunity to Cold, Radiation Resistance (+8 to save vs. any kind of radiation poisoning),
XP: 150

Notes: My players had a chance run-in with a Rock Devil this past Sunday. It is only due to some fast thinking and accidentally coordinated action allowed them to escape the beast.