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.

"Ryuusekisei" or "Dragon Rock Star", Perseus was named after the a hero in the Greek myth who has slaughtered the monster Medusa, whose eyes could turned everyone and everything into stone.

Although he looks like a merciless and anti-social dragon, he is quite the opposite. He is nice to others and does not seem to have a hot temper, but he is very patient. Not liking to be in the spotlight, he prefers to remain in the shadows and rarely moves from there.