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.

Eoptis never felt like he belonged and didn't consider those who helped raise him as true parents. After he found out about a murder plot centering on him, he flew away and blamed his parents for it. Now he seeks out those who aren't considered strong in the world as allies. Helping out those who aren't as powerful has made him some powerful allies since strong dragons are impressed by his standards. He keeps his current locations secret from only but a handful.

While Eoptis meets the physical criteria for a male dragon, he has always felt more like a female in his mind. Despite that, Eoptis prefers to be called male to not attract even a little attention. He prefers that only those closet to him call him a she.