Exodites

The Exodites are a kindred of the Aeldari species that rejected the slow degeneration of their ancient civilisation several Terran millennia before the Fall of the Aeldari, seeing that the Aeldari were already courting disaster long before their fellows. To avoid the coming cataclysm, the Exodites exiled themselves from the core homeworlds of their star-spanning empire to newly-terraformed colony planets called Maiden Worlds.