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 heap of air mana on the seafloor near where Out and a-xbOut lives, and he keeps coming across mana-transformed octopi. He despises the tiny bubbles created by the cephalopods and suspects that if too many air-octopi keep jetting around, the bubbles will change the nature of the water for the worse. Thus, he hunts the octopi whenever he chances across them and is beginning to show signs of air-transformation himself. His gills do not produce the same bubbly waters that come from the octopus exhalations. Some of the others whose territory overlaps the mana deposit like the air-octopi for the same reason Out and a-xbOut hates them—their soda siphons.