Stone Dragons have a tough outer covering made of a stone-like material. They eat rocks, using the minerals they contain for nourishment and to keep up their stone outer shell. They rarely move, and are the heaviest of all types of dragons. Although they have wings, indicating flight ability, no one has ever seen a stone dragon flying.
Rocky the Toughy is a stone dragon. She is commonly seen near caves. She is nicknamed Rocky the Toughy because she is a stone dragon, and is very tough and doesn't tolerate abuse.