Deep Sea Dragons, as their name suggests, spend most of their time in the darkest depths of the sea. They have a bioluminescent dorsal spine that serves to attract prey and communicate with their own kind. As with many deep sea animals, they generally eat whatever they can manage to bait. They rarely leave the ocean floor, surfacing only during breeding season. When they do choose to travel to the shallower depths, they avoid bright lights and will only come up far away from shore.

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.

Curmudgeonly is a big grouch. He's unsociable by deep sea standards, rarely talking to anybody and never staying in the same pelagic zone for more than a year or two. However, towards the end of winter, something strange occurs: the dragon becomes very chipper and uncomfortably genial, as if he forgets what he's been like most of the year. He tries to meet as many dragons as he can and hangs out at the shallow parts where there are lots of creatures at the coast to be buddy-buddy with. By February's passing, though, Curmudgeonly is back to his curmudgeonly self and avoids people again. Some use his appearance at the surface as a marker that spring is almost here, since he always has these odd mood swings right on schedule.