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.

Das Kern was a great comedian - in his mind, at least.  He created elaborate practical jokes to play on his fellow cave-mates, but never was able to carry them out.  Because of the wide range of abilities among the dragons in the cave, and his own limited ability, he had to imagine the outcomes of the jokes and the faces of those around him.  He and his mate, La Rocque, enjoyed imagining the responses, laughing hysterically...for a stone dragon.  The others in the cave assumed they were simply growing new skin as they watched small amounts of rubble fall from the two stone dragons' quivering shoulders.