The Mandrakes are certainly given a run for their money in the nastiness stakes by the Night Lords Chaos Space Marines, who are objectively the most evil subfaction in the 41st Millennium. When their raiding parties coalesce, they call themselves Nemesis Claws, and wanton violence, murder, and depravity follow in their wake.
Contains a deck of 34 Datasheet cards, containing faction rules and equipment, unique plots, operative profiles, and other useful information.