There are dragons on Arnathia. Before the Cataclysm, they were intelligent reptiles with wings giving them the ability to fly. The ranged from tiny to no more than 10 feet snout to tail.
The fallout from the Cataclysm altered the Urnati dragon DNA, and they grew much larger (up to 75 feet in length) and more intelligent. They also learned to master their innate abilities to harness energies, using them much like the rest of the denizens as a form of magic. Each subspecies of dragon has their own specific traits, which are usually defined by the color of their scales.
Dragons bloodlines are held as revered and/or feared, and dragons are considered apex predators as well. They may be protectors, antagonists, or ambivalent. Most bloodlines have similar traits and attitudes about other creatures and beings, with some variation within bloodlines (see the Legend of Rehonu) for an example)