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.

Tontu-Morru acts as a warrior-type dragon.  He loves to fight intruding dragons out of his territory.  He does so by swooping down right above the intruder's head, and shooting them with fire.  This usually maims the attacker to a fatal degree.  However, when he is bored, he kills other dragons by flying into them and locking his jaws around the others' neck, using his claws to latch onto the dragon's hide, and kills it like a prehistoric raptor would kill its prey.  This technique is highly dangerous, though, so he hardly does it.