The Dark Eldar revel in piracy, enslavement and torture, and are sadistic in the extreme. Dark Eldar armies make use of various anti-gravityskimmers such as Raiders and Ravagers to launch high speed attacks. They strike with little or no warning, using an interdimensional labyrinth known as the Webway to traverse the galaxy safely and far more quickly than most races are able to with their Warp jumps.
