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.

Welliume Shadowcast is the younger brother of Mari of November and the second child of Medilyre and Wilfre to remain with Les clan. He himself took the last name Shadowcast, something only done when the other dragons of the family lack one. He is definitely the baby of his family, and is considered only an amateur warrior, preferring flight to fight. He has a potential mate in another Black dragon named Edge Shadowcast. However, she often uses his timid nature to get control over him.