Warhammer 40,000: The Dark Eldar

From the introduction:

It is the 42nd Millennium. For ten thousand years the Dark Eldar have been rapacious pirates and cruel slavers. From the immeasurably vast city of Commorragh or one of its satellite realms, fleets bearing unfathomably advanced technologies set out to menace the galaxy. Their weapons are speed, surprise, and overwhelming firepower. They strike where their foes are weak and return home with a bounty of playthings for Commorragh. The Dark Eldar rely upon such raiding, as without a steady supply of souls theirs would be devoured by Slaanesh, the god they spawned.