A small to medium sized animal, living in cracks of rock formations, with the ability to digest stones and lichens growing on those. Can segregate acidic venom to dissolve certain rock types if they are too big to be swallowed; immune to its own acid, which also functions as a deterrent against predators.
Common variations are light grey, bluish or brownish in color. with a scaley and rocky surface. The older an individual, the more stonelike mineral structures it implements in its body, depending on stone types it digested in its life.