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.

Raging Reilly is truly the angriest dragon anyone has ever seen in Dragon Mirror's Cavernae. He regularly burns the corridor from his isolated room to the cliffs beyond while he charges up it, then makes everyone a very large sheet of glass by angrily burning long swathes of beach sand. While the glass is infinitely useful, everyone would like it a bit more if he didn't have the habit of blasting out of his cliffside entrance, a streak of blazing orange, at the deep night hours.