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.

Like many of her kind, Night's Fury spends much of her time airborne; she's pushing her flying talents to their limits, constantly trying to attain faster speeds and ever greater heights. Night's Fury loves a challenge, and while she normally keeps to herself, she's always willing to try to pull off any new stunt that the other dragons come up with, often punctuated with huge bolts of lightning (which she has dubbed bolts from the blue) and loud thunderclaps. Somehow, she has managed to nickname each and every one of the other dragons, though many of them seem somewhat nonsensical. She is the fondest of riddles in The ARBL's cave. Her closest friends are Frost Wind and Fault Line.