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.

There is a particular stretch of ocean the sailors avoid, because lights have been seen in the depths, and lights mean spirits; but in sharp contrast, dragons who observe this eerie glow move to the spot with eagerness. It's a sign that this dragon is there; possessed of an extraordinary sense of direction, the calm female will tell the lost which way they must go to reach their destination. And in the deepest depths of the water, she serves as a lighted guide through the murky abysses, leading dragons of shallower waters back upwards if they become entangled in the labyrinth of the trenches.