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.

Hadeis Hravi can be translated into "He of the Underworld, the Wild One".

Hadeis is the offspring of Pyresaeia, the leader of the Clan of rogue Hellfire Wyverns that tried to invade the Volcanic Regions. As an egg, he was stolen from Pyresaeia by Nyx Hrava and held hostage against his mother. Pyresaeia's grief stricken howls were heard for days...until she discovered that the dormant hatchling was a male.

Hadeis lost all bargaining power he once had and Nyx had no more use of him. Nyx gave Hadeis' egg to Randiriel, who raised him.

Hadeis was hot tempered and vicious as a hatchling. Or maybe he was just resentful of his mother for tossing him away because of his gender. But under the other dragons' tutelage, his manners have greatly improved. He is a little insecure, but whether he knows it or not, he is a very accomplished dragon. He can breathe fire and fight well, not to mention having a knack for eggsitting.

He is the first of his line and his descendants carry his name.