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Dark Heresy or Warhammer 40,000 Roleplay is a role-playing game sharing the same dark, gothic background as the Warhammer 40,000 tabletop miniatures game. Though the game was intended to eventually spawn two other core rulebooks covering different areas of the 40K universe, the initial releases concentrate on humanity, specifically agents of the Inquisition. Sequel RPGs had the working titles of Rogue Trader - which would have covered interstellar travel, traders, and Xenos - and Deathwatch - which would have allowed players to create Space Marines. However, with Games Workshop's decision to shut down Black Industries and transfer the rights for Dark Heresy to Fantasy Flight Games the future of the line may change and has yet to be announced.

In Dark Heresy, the players assume the role of a group of Acolytes working for an Inquisitor who sends them on various missions. Depending on the type of mission, the gameplay can involve investigation, combat, intrigue, or a number of other genres. Therefore, the Game Master can tailor his campaign to suit his player group. As the players work for an Inquisitor, most missions involve rooting out heresies or matters relating to them, but the breadth of the game allows for many other missions, including wiping out dangerous gangs, gathering evidence of corruption, or eliminating rogue psykers.