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.

William Water, or more commonly known as Will, is a very strong and proud dragon. He is very confident in his abilities, especially his fighting and hunting skills, and organizes and hunts in hunting parties with his friends and family. When someone he knows is in a time of trouble, for example being ill or injured, he will do whatever he can to help them. Because of this, younger Deep Sea Dragons often come to him when being bullied or when in a familial crisis, as he is well known for his generosity and kindness. However, inside, he is very insecure and worried. His worries are just about everything, and despite the calm demeanour he puts on, especially during fights, he is scared. During a fight, he would very much like to leave, but he is afraid of disappointing, so he stays.