Thunder Dragons are the masters of electricity. Their wings gather energy as they soar through the clouds, and when they clap their wings together they can create devastating arcs of lightning. They can stay airborne nearly indefinitely, landing only to sleep and breed; they catch their prey from the air and take moisture from the clouds. A thunder dragon’s roar is considered to be an omen of misfortune.

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.

Cairul is always traveling and only returns to her owner's cave once every few weeks. Despite this, she is extremely loyal and always repays her debts. It is said that she never forgets a thing she sees. Cairul's journeys have taken her to see what many believe to be most of the world, bringing violent thunderstorms to villages thought to be in bad favor. A visit from her is considered to predict that ill tidings are soon to come.