Stratos Dragons resemble sea dragons, but these massive creatures are far too buoyant to swim in the water. Instead, Stratos Dragons use air mana accumulated in their scales to live high up in the skies from the moment they mature enough to leave the ground, only ever returning to the ground in open spaces or very high elevations to lay their eggs. The underside of a Stratos is covered in reflective scales that slowly shift colors throughout the day to mirror the sky and the clouds above, serving as camouflage. Young Stratos consume anything that will fit in their mouths, and are especially drawn to air mana, but adult Stratos are difficult to observe and not much is known about what they eat or where they continue to gain mana. Corpses of grown Stratos dragons have been found with an incredible amount of crystallized light and air mana embedded in their backs, and it is thought that they fly so high up as they would otherwise be a delicacy to many of the more mana-hungry dragon breeds.

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.

Ciel is a majestic Atmoswing sibling. She's among the quieter ones but also the kinder. As quiet as she is, she likes lending a hand (er- fin) to smaller or just less fortunate dragons, the ones that fly high enough anyway. Ciel has a habit of going very, very high up in the air, all the way into the atmosphere. This is normal Stratos behavior, but why this is unique to her is because her family lives at lower altitudes to watch over the other dragons of their home island. But Ciel just feels more comfortable high up in the sky. She tends to go on little excursions, traveling so high up then returning a few days to a week later. She's a lot like her brother, Krypton, in this way, though his journeys are far longer and more extensive. Ciel isn't quite brave enough to leave the safety of her family for that long. She is generally friendly, though rather socially inept. She has a difficult time knowing what to and what not to say, but she isn't near as bad as some of her other siblings.