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.

Haruka is considered to be one of the most gentle of his kind, although because of the love he has for his family, he does not hesitate to enter battle when they are in danger.

Out of all of the hellfire dragons, Haruka is the closest of them to the Cave Mistress. One time he came across her and her steed Ferhan being set upon by large band of dragon slayers and in his rage slaughtered them all. For a long period afterwards he refused to leave her side and acted as her private guardian until Ferhan had recovered.