Guardian Dragons have large shields on the end of their tails. Although the shields appear to be heavy, they are light, yet nearly unbreakable. Guardian Dragons use their tail-shields, as well as their wings, to deflect attacks and protect others. Often, they will guard the eggs and hatchlings of a nest while others are away. They are generally peaceful, and will not retaliate unless necessary. They have no need to forage or hunt, as they are fed by those they protect.

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.

Custos was found by Simul and Sanguis. Custos ran away and was near death from self-starvation. Sanguis ran back to the clan to get some help. After a while, Sanguis came back with Incendium, Centaurus, Ater, Pacem, and Caro. They all helped to bring Custos to their cave. Custos then slowly started to explain herself. She was protecting a group of hatchlings when a large dragon came by and attacked. She was brutally beaten up and thrown to the side with ease and she was forced to watch the dragon kill the hatchlings when she couldn't do anything. She feels the reason those hatchlings died was entirely her fault, and she won't be convinced otherwise. She stays at the back of the cave, not coming out for days on end. The only thing they hear her say is "I'm such a failure..."