Aria dragons are a brightly-colored and sprightly breed, perhaps most adored for their lyric calls. Their song-like melodies fill the areas they inhabit; their coos resemble those of birds, only more elegant and refined. They have fairly strong magical capabilities, but tend to reserve these strengths for last-minute defense, choosing to live their lives in simple peace. Arias, sticking to the tropics, typically live quite far from human settlements, giving rise to the previously held belief that they had gone extinct.

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.

Hunted for her rarity, Rubella was left at the cave as it was trusted to be a safe place to keep such a rare egg. As time passed, Rubella hatched and grew to a beautiful one. She's calm and passive due to the environment she was brought up in. She likes to spend time with hatchlings with Amethyst Barrage, but takes special care of rare dragons because she wants them to have as good of an upbringing as she did. When not actively looking after hatchlings, she spends most of her time in the cave, helping others and tending to the sick. Overall, she's very motherly and most look up to her.