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.

After a brutal attack on his dragon tamer that nearly killed the red dragon Degeros, Luna Dominus decided to dedicate his fighting skill and magic to hunting dragonslayers. He soon realized not all dragonslayers were bad when he met Donovan, a dragonslayer who devoted himself only to protecting humans from bad dragons. The two eventually became friends and they test each other in battle at every opportunity. Indeed, these clashes have become something of a form of greeting between the two. Luna still continues his war against dragonslayers, though he is more conscious of his prey's motivations now, and has been the savior of many a dragon.