World of Zhehon
Long before even the Elves can remember The Darkness has existed. This is an ever-presence negative energy that permeates the entire world and – more specifically – magic. This has allowed the twisting of power to create abberations and undead creatures. It is the source of all evil and corrupt anyone who “touches” its power. It is known by many other names as well: The Taint, Corruption, Black Magic but all come back to the same source of negative energy.
The Darkness can also refer to times when the world was controlled by evil. During the Death Wars the dead did not stay dead from the corrupting influence of Cerion and that Ineos, Death herself, had been killed. When the Dark Races from beneath the earth rose to conquer the surface, the Darkness was literally thrust upon the world, the sun was blackened and The Light was banished. A few historians also refer to the Era of Silence and the Era of the Firestorm as times of Darkness, although this is greatly debated.