A Chuul is a large crustacean with menacing claws. It lives in underground pools, or swampy lakes, even though it is a clumsy swimmer. It eats just about anything that passes by, for it waits just below the surface, then jumps up and paralyzes it's prey with long mouth tentacles.
If attacked by one, the best defence is to stay away. Chuul usually are solitary, but sometimes they are found together, using teamwork and communicating with eachother, to catch prey.