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.

Anguillo lives in the Marianas Trench at the bottom of the ocean, near a hydrothermal vent. He lives alone, though he does have a mate: Windyrm, a skywing dragon. They rarely ever see each other, as they dwell in very different environments. No one really knows how they met, except the parties involved, of course. Anguillo often observes the myriad undersea life, most of which are unknown to the world on land. He does not think he would enjoy living in the air with his mate, as there is very little wildlife miles up in the air. He doesn't know what he would do without his studies, though he does not share his discoveries with others. He is a very intelligent dragon, but somewhat uneducated about conventional knowledge and entirely self-taught.