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.

Water Through a Rusted Pipe lives in the ruins of a once-great city, spending most of her time underground in the network of abandoned, rusted sewers, taking advantage of her amorphous nature to ooze through pipes that should be too small, and coating herself in flakes of rust. However, in the late afternoon she loves to sunbathe high up on the last aqueduct that still brings water to the ruin. The way her translucent body bends the light has convinced several treasure-seekers that she is a ghost, and sent them fleeing the grounds.

To those who actually talk to Rusted, she is a curious and gentle dragon, though perhaps a bit eccentric. She loves to explore, make maps, and writes an extensive journal about her encounters with the alligators, rodents of unusual size, and many stranger sewer monsters. Sometimes, she makes sculptures of her hardened slime, but she isn't very good and has no confidence.