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.

Stone dragons have a tough outer covering made of a stone-like material. They eat rocks, using the minerals they contain for nourishment and to keep up their stone outer shell. They rarely move, and are the heaviest of all types of dragons. Although they have wings, indicating flight ability, no one has ever seen a stone dragon flying.

Watt Richter seems to be a rather despondent dragon, always shuffling around with his head down and never taking part in group conversations. In fact, he is quite happy staying out of everyone's way. The complexity of relationships had always confused him, be it friendship, acquaintanceship, rivalry, or romance. So instead of dealing with the ever changing emotions and complexities of others, he prefers to stand back and watch everything for entertainment. Instead of being the one betrayed in a friendship or stabbed in the back or being teased, he is the one that silently laughs at it all. Despite having the emotional range of a teaspoon, he has found a mate, Raobi, and has had several children with her.