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.

Not Lightning It's Yellow Yarn insistently believes that the sparkling and crackling lightning on her wings are not actually lightning, but really yellow yarn. In fact, as if to prove her point, she's learned how to control them, "weaving" them into little displays to show off to hatchlings and anyone else who isn't too worried about being fatally electrocuted by the volatile displays of electricity. How exactly she learned this masterful art is a secret she never reveals, though she does like to tell the story of how she came to the conclusion that lightning was really yellow yarn (it contains angry gray dragons, clouds, spinning wheels, and tentacles). Such a story is not believed by most dragons, though they do agree that her tale about her discovery of her yellow yarn is quite the "yarn".