Before the fall the Eldar seeded many dead worlds with life as part of a program of colonotion which would take many thousands of years to reach fruition. Many of these worlds did not become inhabitable until many years after the fall , and some were then settled by humans and Orks who were quite unaware that they were living on a planet originaly intended as an Eldar colony. The Eldar refer to these worlds as the Maiden Worlds, or Lilaethan after Lilaeth the Maiden goddess of the Eldar. Since the Fall fresh colonies have been settled from the Craftworlds themselves, often on worlds seeded before the fall, but sometimes on newly seeded or newly discovered habitable planets. The Eldar refer to all such worlds as Maiden Worlds as opposed to the lost Crone Worlds of their ancient civilisation.