Eredun (a.k.a. Demonic) is the language of the demons of the Burning Legion. Knowing that other sentient beings would inevitably join the Legion, the eredar declared that their primary language called Eredun would be the Legion's common language. The written form is called Eredic and is composed of cryptic symbols as illustrated in their spells. It is unlikely that the original dialect of Eredun spoken on Argus, or the language known as Draenei, causes corruption in other races.