Magma Dragons are capable of withstanding the intense temperatures of their element. They live in volcanic regions, their bodies coated in the red hot magma which clings to their scales. They must leave the lava fields in order to hunt, although they require surprisingly little food to sustain their lumbering mass.

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.

Rosoku's foremost passion is music, and his life's work is to fill the volcano biome with melody. Because he can neither craft nor play delicate instruments, Rosoku spends a lot of time gathering fragments of strong material, such as metal and stone, for his work. His masterpiece is a series of large metal cylinders, which occupy an entire living cavern in the Sylvain clan caves. Rosoku made the rods by melting and shaping metal in the volcanoes, and carefully adjusting the weights for pitch and tone. The metal vibrates when heated, creating pure tones that resonate within the cavern. Rosoku himself is rather skilled at creating melodies, and is known to spend hours making music. He often encourages his well-voiced siblings to join him, and will also teach members of the family pure notes for singing.