Frostbite Dragons first appear at the beginning of winter, creeping in with the frosts. They have found their place in human lore as the spirits of snow, since they only reveal themselves during icy weather. In the depths of winter, they cover the world in blankets of snow and are believed to be responsible for the glittering frost that creeps over everything. Although they appear cold and distant, they are actually rather mischievous and enjoy spending time dancing through blizzards.

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.

In the Vampire Clan, Toxic, the Alpha Vampire, has decided to conduct an experiment using ten "regular" dragons and training them to act like Vampires. This way, the Vampire Leader's dark deeds can be accomplished by non-turned dragons, which will hopefully avoid suspicion from others. He has chosen ten different dragons, breeds that are preferably either large or bad-tempered, to experiment with.

Kasdeyah is a rather big grumpy dragon. Her rank as "experiment" is particularly degrading, and she has no trouble expressing her great displeasure for it. Toxic and the Vampires often have hard times getting her under control. Her large size, slippery, cold scales, and sharp teeth make it hard to subdue her, and not even threats of being bitten deter her aggravation. Luckily, her tantrums rarely cross over into anger.

Her hatch-mates, especially Ramzen, find it enjoyable to vex her and break the icicles off her body, though Kasdeyah has no problem sending them flying out of the cave.