A Crone World is one of the original homeworlds first colonised by the Eldar as they rose to power tens of thousands of standard years ago. The Crone Worlds formed the heart of the lost Eldar empire before they were consumed by the creation of the vast Warp rift called the Eye of Terror following the birth of the Chaos God Slaanesh. The worlds are now known as Crone Worlds to the Eldar after Morai-Heg, the Eldar Crone Goddess, who is also the Goddess of Fate. The entire region where the Crone Worlds were located was overtaken by the growth of the Eye of Terror, and the Eldar empire's homeworlds were consumed by Chaos and turned into nightmarish realities that now lie fully within the bounds of the Immaterium.