The cavedragon is a species of dragon who's adaptation to the Underworld has made its wings superfuos and instead developed into an extra set of legs on the back of the creature, assisting it in moving along tunnels at frightening speed.
Cavedragons are more like sixlegged serpents than anything else in shape and their heads are elongated and narrow. They are fast, intelligent, proud and devious. Being top-predators and monstously skilled in magic as well as physical combat they fear absolutely nothing in the Underworld.