Luminox Wyverns are a spritely breed, though their sharp beaks and talons may suggest otherwise. As the fall months approach, they begin to collect and store heat from fire mana, and as the temperatures drop off, they release it through localized spots on their bodies. This enchanted heat creates a bubble of warmth around the dragon, not dissimilar to sitting by a fire, and it causes parts of their hides to glow a striking orange. They are very popular with children, who are enraptured by their bright wingtips, glowing markings, and magical warmth. As a result, they frequently join in on human festivities, much to the humans’ delight.

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.

Because she kept visiting the McCullough family, and because people didn't know what sort of being she was, this dragon came to be known as the Glowing Winger Thinger Who Sees and Befriends the McCulloughs, then eventually just "McCullough" for short. She would watch the denizens of Hogpatch and join them doing chores and attending various festivals, paying particular attention to her namesake themselves. None of their descendants go by that surname, but her name remains. She's long since been identified as a dragon by the descendants remaining in Hogpatch, and they know now that the reason she came to the family so many generations ago was because they made some really good pudding. McCullough would never admit to sampling the jars when no one was around the larder, though.