Old Ones

The Old Ones were a technologically advanced alien race who arrived in Plethira after journeying through the Void for millennia, stopping on various other planets as they did so. They built enormous cities of iron and steel, hunting the old races down to extinction as they drained the landscape for resources. They carried with them thousands of the Flesh-Angels, beings from another planet, who escaped the captivity of their masters and formed the first of the Accursed. The immortal Father of Dragons, Zulaxa, claims to have been created at the time of the Old Ones' arrival. Their civilisation flourished for approximately 40,000 years, until their pollutants caused a terrible disaster befell them: their females suddenly became unable to reproduce. It was around this time that they designed the Eldar, immortal beings who held the knowledge of their predecessors. A century later, almost any living memory of the Old Ones had vanished. Any few who survived certainly left the world, as any trace of their existence was gone.