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.

Asim Custodio means "Protector,guardian." for the asim, custodio means "guardian" refers to the angels of mankind, he had been the wood guardian of felronreach for many ages, very fre remembers his birth, as a egg he often mades wailing sounds deep within his egg and when he was finally born and met his master. he is named for the sound of his voice, which sounds more like a mournful wail then the mighty roar of a dragon. He lives deep within the mists of a barren forest, and is rarely actually seen by wanderers—but anyone who enters the forest is sure to hear his sad song, which can pull at the hearts of even the hardest warriors. Very few creatures have ever met him; and those who have seem to come away speechless. From what is known of him, he's a very solitary creature, who speaks softly and with a vocabulary from a long ago time. There always seems to be a wishful expression in his eyes, and he has a habit of disappearing mid-conversation without so much as a farewell.