Green Dragons are also sometimes called “earth” dragons. They usually live deep within caves, and have power over the earth. They are capable of launching boulders at high speeds, and can cause earthquakes by slamming down onto the ground.

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.

Geosool is a dragon with the Earth at his heart. He is primarily responsible for the majority of the digging done to create and maintain Jmm's cavern system. Geosool's job is near unending, as there are always more eggs and hatchlings being recovered, some of which need unique habitats and retreats. Geosool much prefers to spend his free time extremely deep in the cavern system, and can be difficult to find, but usually surfaces reasonably often to see what he should work on next.