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.

Jemusuto's name means "Gemstone" in Japanese, named after her species. She is even more patient than Kelppa, almost to the point of carelessness. She sits in the cave all day, doing nothing. But she makes herself by useful by carving out sections of cave and eating the rock so there is more room for the ever-growing family of Kouryuu's dragons. The hatchlings like to play on her back, and the only thing she does is growl in when they get too close to her head. To put it bluntly, she won't do any action unless it affects her life. She is a good dragon to be around if you ever need to talk to something and have them understand you.