Among the most elusive of dragon breeds are the Aeon Wyverns, a breed whose innate control over time mana marks them singular and great. They are able to peer into the multi-dimensional plane of time, seeing all that is, all that has been, and all that could be—within a small localized zone. When utilizing particularly strong magic, the black markings carved into an Aeon’s body glow a bright cyan, painting them in an ethereal blue light. In the past, they have been sought after as oracles to bring swift resolutions to major conflicts, but it is in exactly such sorts of times that they are nowhere to be found; rather than influence the outcome, Aeons much prefer to allow the natural order of things to progress, however grim that may be.

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.

Fond of a White Dragon named Bruno Bucciarati, Leone Abbachio travels alongside a band of other dragons under Bruno's leadership throughout the lands of Galsreim. Leone is a very sullen and melancholy dragon, thinking of himself as nothing due to his constant visions into the future, which tend to be bleak, and what he considers to be his most fatal mistake.

Leone's mistake was long ago, with a master who raised him from a egg. Leone loved them so, and considered this human to be his partner. However, at one point, Leone paid a toll to a Almandine Pyralspite in order to pass a point quicker, and reach a treasure before his master could. Leone was impatient though, and not aware he didn't tell the Pyralspite about his master, who was killed trying to look for Leone. The Pyralspite killed them, and mocked Leone for his impatience after he did. Leone watched his master die, and from then on he was considered a pariah among the dragons in the alpines because of this fatal mistake.