Magi Dragons are, as their name suggests, primarily magic users. They rarely use physical forms of attack. They eat anything they can kill, which is almost everything. They won’t kill unprovoked except when hunting, although they may kill humans if in danger. Their strong magic makes them one of the most feared breeds of dragons.

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.

John Constantine is not only Delirium's student but also the fruit of a hot and passionate night she spent with a red dragon of the clan when she was younger. He once wore a different name but to distance himself from the overwhelming presence of his mother, he changed it to a more unassuming one when he came of age. His choice of name was inspired by one of the newer students  Harry Dresden. When Delirium laughed at that name, he immediately chose one of the same style.

While he can't deny his mother's heritage he always rebels against her, spending time with intoxicating herbs or in the company of dragonesses making him his mother's most difficult student.