Dark Lumina Dragons received their names from their highly reflective scales, which—at times—seem to glow. They are vain, always strutting about and preening incessantly; if one of their scales has so much as a scratch or a defect, they’ll remove it. Luckily, their scales grow back quickly, and each new growth is more beautiful than the last. These narcissistic dragons live in small groups and prefer to surround themselves with beauty. The males guard their territory and eggs while the females search for meat to eat. Dark Lumina Dragons are much meaner than their cousins.

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.

Tenmetsu will steal shards of colored glass from the windows of abandoned castles, embedding them into cracks in the walls of her living cavern that contain veins of light mana. She enjoys preening her scales while admiring how the soft colored light brings out her scales' inner shine. Any broken pieces of glass that Tenmetsu didn't manage to position correctly are scattered outside her cave, to dissuade nosy passersby from venturing farther inside.