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.

Atree is a quiet individual and a seasoned fighter. She is normal sized for a deep sea dragon, but she is bigger in muscle. She never talks about her past, the only ones that would know anything about it are Thanatos and Xaria. Atree may come across as mean and easily annoyed, but it's more of a cover over how she really feels about her cavewater mates. She is an extremely kind dragon and helps others when needed, but only when they really need it. She is never really seen, Xaria diving down to spend time with her if she can find Atree.