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.

Berthadhiell is the vicious new leader of the Fell Beasts of Mirkwood. Before she killed the previous leader, the Fell Beasts were nearly wiped out by the Elvish dragons of the Northern Kingdom of Mirkwood. Due to their few numbers and dwindling power, they were forced into hiding for many decades, much to Berthadhiell's rage. Many years she schemed and killed her way to the top, and since she came to power, the numbers and strength of the fell beasts have risen, and continue to do so.

She has made it her personal mission to go to war with the Elvish dragons of the Northern Kingdom, not only for revenge for her kind, but for killing and subduing the Elvish dragons.