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.

Isaac, or Icc (Ike) as his friends call him, is the resident scholar in Les clan. As a hatchling, an older dragon often told him and his clutch mates the tale of an old friend of the family, a black dragon who devoted himself to the study of all things. Isaac became enthralled by the idea of learning as humans do, and when his day of naming came, he received a name referencing a legendary figure known to be very bright. He has since thrown himself into the study of many different subjects, becoming a source of scientific information and trivia for Les clan.