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.

Watermister is the quiet and unsocil type. He spends his time sleeping on the banks near the pond where it is muddy. The only time when he shows his playful side, is when a human named Nicole visits the clan. Everywhere she goes in the clan's land, he goes, even to visit Waterskin when very few other dragons would. When she leaves, he is found back in the water or on the bank, sleeping.