Waterhorse Dragons received their name due to their horse-like physique and endearing behavior. They are capable of surviving out of water, and when on land their skin secretes a gelatinous goo to retain moisture. However, their large paddle feet are better suited for swimming, and waterhorse dragons tend to move very awkwardly when on land. Waterhorses are very friendly dragons and enjoy playing with humans.

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.

Marthil Hadad was a waterhorse dragon, usually seen prancing on the surface when ships and cruisers sailed the waters near her colony habitat. People found her unique behavior quite entertaining

She had a friend, a deep sea dragon named Hakh'al Mumbadii, who loved to listen to her tales and stories about the beautiful life on the surface, because he was born with unique physical traits that made him unable to go near the shallower depths. Their friendship endured hundreds of years, and within those years she learned how to transfer her feelings telepathically, so she could describe the beauty of the sun's dawn to him, along with the warmth of its light.

But humans' greed finally got to her, when the Baardard Nikhim, a group of dragon slayers from the East set sail to hunt down the pretty waterhorse dragon. She tried to struggle against them, but humans' arsenal of cruelties finally able to inflict mortal wounds on her. She died along with Hakh'al who tried to help her.