Horse Dragons have equine-shaped bodies and hooves instead of claws, which allow them to be fast runners. They specialize in running takeoffs, which are quicker than taking off from a stand-still. Horse dragons are able to stalk their prey from the ground then quickly execute an aerial attack for the kill.

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.

Computation loves to run and race other dragons on the ground, and she is fond of humans and their competitions. She is a trainer for human runners, using varied styles depending on whether they are short- or long-distance runners. The first few years of teaching, she had almost no clients stay for long since the humans thought being taught by a dragon was an odd novelty, but she was respected by many within three years when her athletes began winning some big-name races. Computation has tirelessly guided humans of all kinds—from marathoners to just those who want a hobby—for more than a hundred years. Most humans she befriended at the beginning of her career are dead, and she remains alive while many more retire and join the choir invisible. When asked if that upsets her, Computation waves her forelock aside and explains that she believes some part of them remains alive and running, their spirit or soul or something. So old runners never die, they just move to a better pace.