Dark Eldar

The Dark Eldar are a subspecies of Eldar who also function as a separate faction and society. The Dark Eldar originate from the Eldar who, unlike those aboard the craftworlds who adhere to strict lifestyles to avoid a repeat of their civilisation's downfall, continue to indulge in sadistic hedonism, regularly abducting and torturing members of other races for the sake of pleasure, and to prevent the Chaos god Slaanesh from consuming their souls, the fate of all Eldar who remained on their homeworld during the Chaos god's birth.