Memory:Stone snake

This creature of the earth slithers through solid stone as easily as others pass through air. They strike with the strength of the rock they inhabit, knowing a safe retreat through adjoining stone will provide a chance to heal and strike again. Their skins greatly resemble the rock they inhabit, but nobody is certain whether this is a protective coloration or if they are actually made of stone. This can't be right: Snakes can swim in the water or crawl on the ground, but if one actually floats through the rock like this one, your eyes must be playing you a trick. You really should get some sleep.