When Water Dragons mature, they lose the ability to survive on land, entering the water permanently. They are adept swimmers and eat whatever fish are in the lake they live in. They tend to inhabit the same lake for their entire lives, although a few live in the ocean and swim all over the world.

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.

Deepfin loves to race with the other fish in his lake, mainly due to the fact that he always wins. As he grew older, his cries of loneliness became more frequent. At night he tends to make weird sounds, which express his loneliness. He lives alone in his lake, which seems to get smaller and smaller as he grows. He is bored all day, since he doesn't have a partner and is extremely glad when a dragon visits him. He gladly gives piggy-back rides for his owner whenever she pays him a visit. Under the water he uses four long sensors that are situated at the sides of his head to navigate himself.