Royal Crimson Dragons are so named due to their massive size and confident, regal bearing. Most of the time they are laid back, ignoring non-prey creatures smaller than themselves, although they will occasionally take fresh kills from other dragons as a reminder of their place in the social order. Although there are few other dragons large enough to pose a threat to Royal Crimsons, they have little tolerance for potential rivals and will fiercely defend their territory from such intruders.

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.

Sangrefuego, meaning 'blood fire' in Spanish, is one of the most skilled fighters of the clan and gets his name from his always blood stained claws. While the clan leader Rainefrost tries to encourage him to train the younger dragons, he has little tolerance with them so he tries to avoid training. His grouchy character makes him not the most popular in the clan but he is definitely one of the most loyal. He completely abhors hunting as he lacks patience and will often end up chasing away all the prey in the vicinity. On border patrol, he tends to stir up more trouble by taunting dragons from other clans so the deputy, Aurumcry, avoids assigning him duties. Instead, Sangrefuego likes to spend his time practising his fighting skills with dragons whom he considers his equals.