It was previously believed that purple dragons were exclusively female, but this is not the case. Recent environmental shifts have revealed the existence of both genders of this breed. Female behavior is well known; they are primarily herbivores but will eat meat during mating season. On the other hand, very little is known about the behavior and habits of male purple dragons.

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.

End of the Rainbow has a strange, obsessive personality, to say the least. He takes it upon himself to care for every egg that passes through the Flock's cave, much to the annoyance of the more experienced nursers. However he usually respects their wishes and leaves the eggs alone...for a while—then he gets back to his obsessive fussing. He is delighted every time he is asked to make another dragon more fertile, because it will mean more eggs and more life for the Flock.