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.

The human Mirhana, a keen dragontender, thought she knew all dragon species in the world, but one day she came across a purple egg with strange markings that she'd never seen before. Curious, she took it home, warmed it and waited for it to hatch. From the eggshells emerged... a horse's foal! This was not what she expected, yet she kept the foal and looked after it, discovering it ate meat instead of grass. As the dragon matured, Mirhana grew terrified of the freakish meat-eating winged purple horse. The fact that in a murderous frenzy Capull ate all the livestock she kept on her farm didn't really help. The Guardian Sabhail, seeing how scared her owner was, then chased Capull off the premises.

Since then, Capull has been roaming the lands, never really finding a home. Feeling rejected by both humans and dragons, he is not keen on strangers and will attack those that come too close. He is stubborn and selfish by nature, paying little heed to others and the boundaries of territories.