Silver Dragons are arguably one of the most beautiful types of dragons. They live in high altitude habitats such as mountains. Male Silvers hunt and eat meat. While not as beautiful or radiant as females, silver males possess better physical attributes, such as strength.

Dragons are highly-intelligent reptilian creatures that—from a human perspective, at least—appear to live forever. Many different varieties of dragon exist, each with their own unique qualities, habitats, and behavior. Adolescence in dragons 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. In Galsreim, dragons and humans coexist peacefully.

Castiel is a good dragon at heart. He deals with the humans living on and near the lands of his clan and acts as a protector, adviser, and warrior for them. He is quite fierce in that regard and not nearly as friendly as many humans assume a Silver dragon should be. Over the years Castiel has formed a bond of friendship with some of the short-lived mammals under his care, and he really tries to understand them and their strange habits, but regularly fails.

Some might assume that this is mainly due to cultural and species-related differences, yet the truth is Castiel's habit of taking everything literally and his inability to take anything less than deadly serious make him an outsider among his dragon brethren as well.