Hellfire Wyverns are so named for their foul tempers and fiery visages. Their social structure places all females above all males, due to superior physical characteristics and violent dispositions. Forced subservience of the males causes them to become vicious, petty, antisocial, and passive-aggressive compared to the aggressive and social females. However, orphaned hatchlings raised by foster parents of another species can develop surprisingly even tempers and mellow dispositions, proving that their defining unpleasant nature is, in fact, a learned behavior.

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.

Nenshou Suisei's name means "burning comet."  His rough, pebbly armor is reminiscent of a volcanic rock.  While the other dragons had originally called him a name meaning "pebbles," Nenshou crafted his adult name at some point during his adolescence, boasting that it had a more ferocious feel.  Full of bluff and bluster, this dragon does not generally engage in full combat.  He prefers to quietly fuel the ire of his mate, Boukun, and then take a secondary role in any resulting battles.  Sometimes he even acts as peacemaker, herding her away from the fray.  It is unknown whether or not Boukun realizes she is being manipulated.