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.

Thunder dragons have a great potential to be very noisy, what with their thunderclaps and ability to create bright arcs of electricity at ease. Rock and Roll Thunder is a noisy thunder among thunders. She has a big appetite and spends much of her energy clapping her limbs, "singing", and hitting rocks together. Her best mate, an astrapi xenowyrm, is always around to join in the fun, and he has a guitar and magic to amplify it. Dragons living on the mountain either do their best to ignore these two or complain that someone needs to shut them up. To be fair, some people do consider their performance entertaining—in fact, many young dragons are enthralled by their odd sort of music and want to be like them.