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.

Ocean's Heart hatched far below the realm of the Sun. He got his name from when he brought back a heart shaped pearl, whose oyster was set in Aquamarine. He often dives deep underwater and does not come up for weeks exploring one shipwreck, visiting a coral formation, or underwater volcano. He is endlessly patient in his explanations of what it is like to live underwater, which he is bombard by all the hatchlings. His constant companion is a whale named Ocean.