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.

When two stones come together, a fire sparks. Piroboli is the fire that ignited between his adoptive parents, Cheroboli and Terroboli. When Cheroboli found this Wyvern as an egg lying at the mouth of a cave, she glowed with compassion. As a result, this wyvern has a temperament very unlike wyverns. From Terroboli, he's acquired an aloof demeanor and a love of flying. From Cheroboli, he's acquired a knack for staying out of trouble. Now, he's mild tempered and keeps to himself. He does not realize how odd his upbringing is.