Roleplaying in Games Workshop's Warhammer 40,000 universe. You are an Acolyte in the service of the Emperor's Inquisition. You stand in the front line of a great and secret war where your duty is to hunt out the foul stench of heresy, the vile alien, and the twisted influence of Chaos. You will tread where others fear, venturing to distant planets, ancient space hulks and the unsavoury depths of the under-hive.