Sandwaste Dragons are sparsely distributed across very hot, sandy, dry deserts. They grow to large sizes, but very slowly, and they are well adapted to the harshness of the desert, being capable of surviving for long periods with very little water and food. They are constantly on the hunt for prey large enough to sate them, catching it mostly by ambush or, rarely, running it down. However, Sandwaste dragons are opportunistic and will not shun carrion, insects, and even plants when desperate. They are solitary and nomadic and build no lasting bonds with one another, though there is little animosity among Sandwaste dragons when they encounter each other.

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.

Toxodon is a mail carrier with the Pena Postal Service. She speaks little, doesn't ask questions, and doesn't indicate whether she understands what her boss is saying, so nobody knows how she'll do on an assignment until she's already on it. Someone so unfriendly and uncommunicative would normally be let go pretty early, but Toxodon is one of the few workers who can traverse some of the most dangerous areas of Pena to deliver mail, like Brickdrop Forest, the Desipit, Hell Plateau, and Sunshine Sugar Valley. Whatever Toxodon's schedule looks like, she sometimes returns to the hub very late, and none of her colleagues knew why until reports kept coming in about a mysterious sandwaste with a Pena Postal Service kit bag settling disputes and rescuing denizens in the places she's supposed to deliver mail. Toxodon would vehemently shake her head when asked if that was her, but everyone has their suspicions.