Aureum Malus was originally formed as part of Erebos forces, under the lead of his valkyries. Humans fought side by side with valkyries against other gods and monsters. Which wanted to disturb the balance of chaos and raum. Each legion was led by one of the angelic valkyries.
Since the fall of the valkyries and disappearance of Erebos, humans lost the knowledge behind the meaning of Aureum Malus. Thou tales are still told of glorious angels and humans which slayed monsters and gods. The priests which saw their oppertunity turned the truth into tales and demonized all of the valkyries, gods and monsters. They preached that all of those demons where against the will of their creator. Every creature which devours chaos shall be destroyed. Each human which shows signs of having the craving for chaos in them shall be slayed or enslaved. Those where no humans. Those were not allowed to wander over earth. Earth shall be cleanced of all those disgusting unworthy creatures.