The Inquisition is one of the most widely known, and feared, organisations of the Imperium. Its mandate is to investigate and stop any threat to the Imperium and mankind, and it will use
whatever means it must to ensure this goal is met. Individual Inquisitors are free-roaming trouble-shooters bound by no laws or authority. There are no bounds to the Inquisitor’s field of operation—alien plots, administrative inefficiency, corruption, mutations, crime, secret cults, heresy, and unauthorised psychic activities all come under his jurisdiction.
Inquisitors can act alone, but more often than not they are accompanied by an entourage of retainers and warriors who have been requisitioned to help them with the task at hand. Any of the Imperium’s many fighting forces may be pressed into the service of an Inquisitor—the greater the perceived threat to humanity, the greater are the forces gathered to fight it.
No world, no organisation, no individual, is immune to the Inquisition’s gaze; planetary governors, even the High Lords themselves, are subject to investigation and no treachery or betrayal of the Emperor is too petty to be left unpunished. However, it is the psyker that commands the majority of an Inquisitor’s time. Untrained or deviant psykers represent a terrible threat to humanity, and it is the pursuit of these that has earned the Inquisitor the name of witch-hunter across the galaxy.