Dybrinthe were a bipedal humanoid species with bright skin, wide eyes, and a gill-like respiratory system. They had hands with five digits. Outside Dybrin 12, Dybrinthe were required to wear large breathing apparatus that supplied them with processed atmosphere via hoses. They also had to wear suits that simulated the higher pressure and temperature that they were use to.

The species lived in clans, with each clan controlling its own territory. Fuel, bubbling up from Dybrin 12’s vast underground oceans, was collected by mobile refinery-cities, which would then process the fuel. It was commonplace for Dybrinthe clans to raid other clans, though this became less prevalent. However, rival clans would still tunnel underground and attempt to divert fuel to their own clans. Within clans, Dybrinthe society was ordered into castes, such as engineering castes.