Dragons are creatures with nearly unlimited life spans. They can survive for long periods of time, and no one has found a dragon that has died of old age. Adolescence 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. Once they hit adolescence, hatchlings change quickly, maturing to their full forms in only 2 years.

Dragons don't communicate with each other verbally, but they will growl to scare off predators and frighten prey. Young dragons will emit an extremely high-pitched squeal when they are frightened. To communicate, they use telepathy with each other and to speak to other creatures.

Black dragons are warriors. They are strong and capable in battles of force, but also ample magic users, capable of devastating opponents with their spells. Their bright eyes give them excellent night vision, which is why they generally hunt during the night.

Coelus is a black warrior dragon of the "Nyx"-tribe. This tribe is actually more a confraternity  of like-minded dragons; the members don't like the idea to fly into battles every now and then. Coelus, moreover, is a kind of professor among the dragons: whilst the others mainly train their physical skills (even if they'd rarely use them to do any harm), Coelus searches the sky night for night for special constellations and depicts all extraordinary pictures on scrolls. He's often consulted for astrological reasons and his silent dream is to fly to the Vesper one day.