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.

Dragons are highly-intelligent reptilian creatures that—from a human perspective, at least—appear to live forever. Many different varieties of dragon exist, each with their own unique qualities, habitats, and behavior. Adolescence in dragons is usually marked by the growth of a hatchling’s wings, although not all breeds of dragons grow wings and some breeds have other traits that indicate the beginning of maturation. In Galsreim, dragons and humans coexist peacefully.

Her name is a variation of the Japanese word for "rock". Yurasuto is a peaceful, lazy dragon whose perfect day consists of nothing but eating and sleeping. She is a pacifist, so when she is forced to fight others, she will merely knock them out. She is a good friend to have, especially considering she can defeat an opponent with a light punch. Because of Yurasuto's strength and heavily armored body, she acts as a defensive fighter for her clan.