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.

Green dragons are also sometimes called "earth" dragons. They usually live deep within caves, and have power over the earth. They are capable of launching boulders at high speeds, and can cause earthquakes by slamming down onto the ground.

Sickness was an experiment in neglected dragons. From the day her egg was laid to the day she became an adult her dragon researcher kept her hidden until the last possible moment. It took all of the dragon researcher's will to keep her hidden, isolated and alone for so long; the researcher even made it so she had softshell as an egg to better the chances of her being sick. In the end the experiment was a failure but she is still much weaker than normal dragons of her breed. While the researcher shows little remorse, she WAS only following orders after all, the researcher wonders how many dragons have died in trying to replicate these poor, isolated creatures that live their lives crippled and weak.