Grey Arts to Dark Arts
From a separate Dragon Realm
Runic Dragons were an average species of Earth Dragon, but somewhere along the line they separated off into their own realm and began doing things their own way. When Runic Dragons are born, a Rune is cast, and that Rune is emblazoned onto the Dragon- it becomes their surname, and they are tasked with living as the embodiment of that Rune. These are a newer species, since Runes themselves are not very old. These Dragons tend to be younger, and their skills vary widely.