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.

Magi dragons are, as their name suggests, primarily magic users. They rarely use physical forms of attack. They eat anything they can kill, which is almost everything. They won't kill unprovoked except when hunting, although they may kill humans if in danger. Their strong magic makes them one of the most feared breeds of dragons.

Terradus is a docile and humble magi dragon. Though Terradus is not necessarily soft spoken, he does have a way of keeping to his own similar to his mate Onyxala. This is not necessarily intentional though as he is fairly outgoing when given the chance. He is considered the yin to Onyxala's yang. While she is fierce and fiery, he is a calm and peaceful. Due to his nature he is a great nurturer to his children, though this is not to say that his mate is any less so to their young.