Geode Dragons are closely related to Stone dragons. They are covered in a hard stone-like material as well as beautiful crystal. Their wings are entirely useless for flight, but they help attract mates. The dragons with the most brilliant and colorful crystals are more likely to mate.

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.

Grant Cohen is a dragon with an unnatural head for math, frequently making precise calculations and challenging himself with "unsolvable" equations  for fun. It's a skill that freaks out other dragons, many of which find math to be a challenge only Keepers need to deal with, but Grant revels in the awe (or fear) that he inspires.

He hangs around Sammi's musical crew most of the time, but whether it's by force or by choice, only Grant and Sammi know. Whatever it is, he doesn't seem to enjoy it, criticizing Sammi's strange beliefs and behavior while lamenting the fact that they're not maximizing their time or minimizing their breaks or whatever he claims will make their musical careers more "efficient." His head for math is what keeps him around, really, despite his whininess, they need him around to calculate how much space they need for their performances and projected audience.