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.

When water dragons mature, they lose their legs and the ability to survive on land, entering the water permanently. They are adept swimmers and eat whatever fish are in the lake they live in. They tend to inhabit the same lake for their entire lives, although a few live in the ocean and swim all over the world.

Undina is a friendly water dragon, living in the ocean with creatures called Undina. Tsu, a young undina and best friend with the blue dragon, was saved by the dragon when she was still small, so she named her protector after her species to honour him.

They both love swimming through the great depths of the ocean and sometimes, they can be seen playing on the surface of the water.

Undina was also the first dragon to hatch and grow up to Zafirmei.

Tsu and the idea of Undina (c) Selene-soulwar