The Webway is a network of passages half in the Warp and half in realspace, used by the Eldar to travel between waygates and inhabited by the Dark Eldar. During the Fall of the Eldar the Webway was damaged, so there are many places where Warp entities can enter the Webway, making it a perilous road. Most passages are more than large enough for a starship, and as the Eldar and Dark Eldar do not have Warp engines, it is their prime means of moving long distances.