The illumians are a race created by sorcery. Prior to the Draconic Empire, this race did not exist. Through powerful rituals, the empire created this race to act as helping hands in future magical efforts. The first illumian, Tarmuid, eventually ascended to godhood along with the rest of his cabal. That ascension was unexpected, but there was little that the dragons could do about it at that point.
The illumian have spent very little time in Alania at any point in its history. For this reason, most Alanians have no idea that such a race even exists. Given the way the illumians dress and handle themselves, they are often taken as somehow being nobility and are treated as such.