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.

Nerokerubina is a loner. He spends almost all of his time in the exact same spot, watching over the remote mountain cavern that serves as the den of Mobius, Alpha of the local dragons. Aside from giving him an easy way to serve his clan, it also allows him to stay away from other dragons. Despite being a bit larger than a normal stone dragon, Nerokerubina is very shy, especially with dragons he doesn't know, which is almost everyone considering that he prefers to stay away from others. When forced to interact, he doesn't say much and seems to be almost emotionless.