Tri-Horn Wyverns are a mountainous species, living in high altitude areas among rocks and snow. The rough and rugged climate has bred a tough and hardened species, prepared to do battle with both the elements and other creatures. Their most distinctive feature is the three-horned crest mounted upon their head, for which they were named; these toughened spikes are powerful weapons, used to battle against predators, prey and fellow Tri-Horn Wyverns. Both males and females of this species fight for territory and resources, and wear scars with pride. However, Tri-Horn wyverns have a soft side beneath their many spikes. They work in loyal packs, of which they are deeply protective; if one can gain their trust, Tri-Horn wyverns can be powerful allies through the mountains.

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.

The history of Nelia Nuria is tied to that of One Nakusa. Ember Nuria, a young human girl, found Nelia on a mountain. Ember brought the egg to her home in the highest mountain of Elgar, and raised the egg there. Nelia was play-fighting with the other dragons even before she could fly. However, the little dragon also grew to be very loyal, and would protect her "family" no matter the cost. When Nelia had grown, she became the protector of Ember and all the hatchlings of Elgar. Any danger they found themselves it, even if it was a hatchling learning to fly, Nelia was there.

One day, Nelia was playing with some hatchlings when a large dragon of her kind dropped out of the sky in front of her. The hatchlings shrieked and scurried away, and the dragon made as if to bite them. Nelia fiercely attacked the intruder, and the scuff soon caught the attention of Ember. She tried to stop them in vain, and Nelia defeated the other dragon. The other dragon, as it flew away, named itself "One Nakusa".