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.

Nephele is the most observant dragon in the Ruda Clan. Because of this, her opinion is highly valued by her peers and it's believed she passed this trait on to her daughter, Minato the Passive. However, getting information and an opinion out of Nephele is very difficult. Some dragons would rather get into a fight with three dragons at once than try to get her to talk. Nephele speaks and offers her insight when she feels like it: no sooner, no later. Unfortunately, this is often after a large amount of unnecessary arguing and violence has occurred. And usually after she's done lounging around and napping for a bit.