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.

Crypt Watcher is a stone dragon who is very obsessed with the death of mortals. He often stands guard at various cemeteries around the world and investigates all the different headstones, and reads about the people that are buried below them. It is unknown why Crypt Watcher is so into death, but legend has it that it is because with him being a dragon and hence nearly immortal it is a fact that he may never experience death himself. It also explains why Crypt Watcher doesn't bother to make friends with anybody but others of the dragon kind because he does not wish to go through the constant pain and suffering of losing somebody. Considering the fact that Crypt Watcher himself cannot die, he would never get to see his mortal friends again.