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.

The Deirwater tribe has existed for millenia. It began as a group of Deep Sea dragons that, upon seeing the diversity of life around the surface, decided to leave the abyss and ravage the coastline, terrorizing and looting whatever group they came across. They would recruit any dragon who seemed as vicious as themselves, and at one point were large enough to become known as the "scourge of the ocean".

Peter is the current leader of his section of the Deirwater tribe. The group is smaller than it once was, but their territory is so large that a full patrol can take several years to complete. When Barra reported that the island they were approaching had grown considerably since their last visit, Peter was incensed. How dare those ignorant land-dwellers expand into Deirwater territory!

Peter is experienced in the art of battle, and has many scars along his body. His ruthlessness and tenacity make him a formidable opponent, and no matter the size of the enemy, he rarely loses a fight.