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.

Lurking quietly in the depths, as her breed is wont to do, Rhea d'Abyss floats, waiting for prey to drift by. While it has its own wonders, the deep does get monotonous, so Rhea has taken to dreaming as she waits, her bioluminescence flickering dimly as she drowses. At times, a stray fish may brush past, escaping only because of her inattentiveness. She sleeps more and more as time passes; it may be that one day she won't wake up.