Split Dragons use their sharp teeth and wings to hunt large animals and rarely eat plants. They are intelligent dragons who enjoy mental challenges, preferably alone; Split Dragons are normally solitary except during mating season. When mating, many dragons come together in a group to raise their eggs and hatchlings. These groups tend to be very noisy—reminiscent of a thunderstorm—and last only until the hatchlings are capable of surviving on their own.

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.

Two-headed dragons are unique enough to deserve a separate classification from ordinary dragons. They have two necks, two brains, two mouths, but one stomach and one main body. The two heads usually work together, but there are times when they will fight each other, snapping back and forth. Their unique anatomy prevents them from breeding with single-headed dragons.

Ziyu's two heads hold different personalities, but they are not usually present simultaneously. Usually one head will be awake, in control of the body, while the other head rests. As such, Ziyu never sleeps entirely.

Zi is the dominant one during day. Zi is a bit of a showoff, and loves to strut his stuff, especially in front of the ladies (although he has never found one who will tolerate him for long). Zi is fearless, and loves to challenge others, often by goading them. He's definitely a thrill-seeker.

When the sun falls, Zi usually rests, while Yu is in control. When Yu wakes, he makes sure that Zi hasn't gotten him in any serious danger.

Yu is more passive, which is good, because he's often cleaning up after Zi. Yu absolutely adores stargazing. He is fascinated with the unknown of what lies beyond his own world, and dreams of being able to explore the cosmos. But, he knows that isn't possible, so he sits up high, losing himself in the view of the sky above.