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.

Humdinger was another dragon that came to the cave as a hatchling, already weathered and worn from being abandoned so early in life.  He also already had his wings, but wasn't very good at using them, and was jealous of all the dragons that could.  He's still jealous of the skywing dragons in the cave when he sees them taking flight and flying around so majestically, and prefers to socialize with the reds and two-headed dragons when he can, and even the mints.  He knows he'll never be graceful, but he's not always so bitter.  In fact, he hides his jealousy of the flightier dragons well, often friendly and joking with them about his lack of grace.  Many of the dragons think him somewhat of a comedian for this behavior, which suits him just fine.