Thunder Dragons are the masters of electricity. Their wings gather energy as they soar through the clouds, and when they clap their wings together they can create devastating arcs of lightning. They can stay airborne nearly indefinitely, landing only to sleep and breed; they catch their prey from the air and take moisture from the clouds. A thunder dragon’s roar is considered to be an omen of misfortune.

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.

Disease Vector Derek is very smart in the realm of physics and is good at teaching the public, but people stopped focusing on that when they noticed that he's as good as the average bat at spreading diseases. The problem seems to be that he's immune to many pathogens that infect creatures, or decades of travel around the world have made his body very resilient, probably both. Either way, once Derek starts coughing or sneezing, people around him either stay away, wear masks, or prepare potions or spells to help keep them healthy.