The game was supported by Games Workshop's Specialist Games division, which periodically released new rules for the game through the Specialist Games website Home | Games Workshop Webstore. The game was intended for older wargamers, aged 16 and up.

The Inquisitor rulebook was available as a hard copy from Games Workshop,^[3] or as a PDF from the Specialist Games website.^[4] It gives information about the Inquisition and the Warhammer 40K universe in general. The name, when written, is sometimes shortened to =I=, =][=, or -][- by fans, in homage to the symbol of the Inquisition as depicted on the cover of the rulebook.

Inquisitor uses a rules system in which two 10-sided dice (known together as a d100 or d%) are thrown to generate a percentile value, with one die representing the "tens" and the other representing "units". Standard six-sided dice are also used for several of the game's mechanics.

There are, technically, no limitations on the effective power and equipment of a player character - the rules do not prevent a player from creating a character armed with extremely potent combinations of equipment and skills. The game rulebook does offer an optional "points" system that the organisers of a campaign might use to limit or guide their players, and the general expectation is that players exercise common sense when creating their characters. Unlike a tactical wargame or role-playing game, Inquisitor describes itself as a "narrative" skirmish game, with an emphasis on storytelling in the nature of action movies or adventure novels, as opposed to a focus on winning at all costs.

Source books edit

There were several additional companion rulebooks for the Inquisitor game available:

• Thorian Faction Sourcebook:

This book details the background and history of the Thorian philosophy and those who follow it. Amongst other topics, the book focuses on the efforts of Promeus, a semi-legendary figure from the earliest days of the Imperium, and his desire to revive the Emperor of Mankind from his half-life existence on the Golden Throne. It traces his and his followers', the Promeans, attempts to achieve their end, and their conflict with their allies and later rivals led by Moriana. Over millennia, the two factions slowly disappear, but their history and achievements paved the way for two factions, the Thorians and the Horusians, to rise and seek out a new way to approach the divine nature of the Emperor.^[5]

The book details additional characters and how the followers of the Thorian philosophy interact with other Ordos of the Inquisition. It also provides additional weapons and powers to be used by the Thorians.^[5]

Campaigns edit

There are three campaigns in the game and each has a Conspiracies book:^[1][2] These books are no longer available from Games Workshop.

• The Cirian Legacy details the planet of Cirian V, controlled by Tech-Priests of the Adeptus Mechanicus. It includes three individual campaigns, lists and details on important characters, groups that deal with Cirian V, and background on the Scarla sector surrounding Cirian V. The campaign begins as a simple mission for the players to discover why the Adepts of the Conclave have ceased paying their Imperial tithes. But as the situation deteriorates - in a mess of rioting miners, psychotic tech-priests and hallucinogenic smoke - the players are confronted with even more sinister events unfolding.
• Death of an Angel contains three different campaigns. Set on Karis Cephalon, the campaign guides the players both as allies and opponents in a storyline that begins with a simple mutant uprising, which swiftly takes a turn for the worse. Who is trying to release the daemon Phraa'gueotla, and why? And can there really be any substance to rumours of a pre-Imperial superweapon - the Angel - hidden somewhere beneath the planet's surface?
• Heavenfall contains two campaigns with details on important characters and background. The machinations of Inquisitors Scarn and Lichtenstein have collided on the once-beautiful Equinox. Faced with a rogue assassin on the loose and the enigmatic Eldar taking an interest in a world that was once theirs, the players are presented with a dire situation with no obvious hope for success.

Player characters are usually represented in-game by 54 mm miniatures purchased from Games Workshop, roughly twice as large as the standard 28 mm Heroic scale of WH40K miniatures. The models available represent existing characters (such as Witch-hunter Tyrus, or Inquisitor Eisenhorn) presented in the rulebook. Players wishing to depict their own unique characters are generally required to extensively convert their models, or give them unique paint schemes. However, the distances given in the rulebook are written as yards, so that players can use any scale of miniature they wish, including the same models with which they play standard Warhammer 40,000.^[3]

There are many different groups that players can play. Presented here are the archetypes represented in the Rulebook:^[3]

• The titular Inquisition: An order that operates as a secret police of the Imperium, charged with rooting out threats to mankind from both within and without, and granted absolute authority in its mission to do so.
• The Adeptus Astartes: They are the "Space Marines," a legion of warriors that serves the Emperor of Mankind, being genetically enhanced supersoldiers, fanatically devoted to the cause of the Imperium.
• The Adeptus Mechanicus: The engineers of the Imperium, focused primarily on technology and research.
• Rogue Traders: Bands of merchant-adventurers or similar people, whose allegiance may vary.
• Cultists and Fanatics: Street preachers and zealots who mostly serve the Ecclesiarchy and worship the Emperor of Mankind.
• The Imperial Guard: The primary military force of the Imperium - unlike the Adeptus Astartes, they are most often normal human beings.
• Desperados: Gunslinging rogues akin to Rogue Traders, their allegiance may vary.
• The Enforcers: They serve the Imperium but may also operate as independent/rogue groups under the command of a disloyal commander of an individual ruler of a world.
• Mutants: Mutants are humans either warped by the power of Chaos or mutated due to genetic deviancy. They are hunted down by those Inquisitors who deem any mutation as a threat against humanity and the Imperium.
• The Ecclesiarchy: The religious organisation of the Imperium, officially known as the Adeptus Ministorum, they maintain and spread the worship of the Emperor of Mankind.
• Arco-Flagellants: Heretics deemed by the Ecclesiarchy only able to gain redemption through their use as mindless living weapons against the enemies of the Imperium.
• The Assassins: Formally known as the Officio Assassinorum, they are trained warriors who specialise in assassination, killing in the name of the Imperium and the Emperor.
• Daemonhosts. Daemons of the Warp which are imprisoned within human hosts. Primarily used by the chaos cults, as well as some factions of the Inquisition.

Inquisitor was given two primary critical reviews by RPGnet upon its release:

The first, in July 2001, was written by Charlie Engasser. In his review, he states that the positive aspects of the game include that "the production values as far as the printed material are excellent" and that "Anyone familiar with the Warhammer universe will be pretty much at ease here." Conversely, he includes as negatives the cost of the game, and stated that "Completely ignoring races like the Space Orks, Eldar and most importantly, the Tyranids is a pretty glaring omission."^[6] The later release of random character generators (such as in White Dwarf Magazine, issue 258 and the second issue of the Inquisitor supplement Exterminatus) has partially rectified the latter problem, as well as the release of a supplement specifically describing a campaign against the Eldar.

The second, in August 2001, was written by Sean Broughton-Wright on the gameplay and mechanics. After noting problems with the variability of product quality ("the usual excellence displayed in such figures as Artemis to the rushed look of some others like Slick Devlan") and complimenting the quality of artwork ("all the good stuff that you'd expect of a Games Workshop product set in the 40K Universe"), he discusses the mechanics; he states, "The great strength of the GW game in its gearing towards competitive play is understandably missing here. As a war game it isn't very successful either." Among other issues, he was "bogged down in rules" and stated that he "Can't help but feel this would have been better as a first person shooter." This revolves around the issue that he points out, that "There seems to be very little support, even when compared to other sideline games like Mordheim."^[7]

However, while the above points on competitive play are accurate (although there is an annual tournament,^[8] the players are primarily ranked on their contribution to making the game an entertaining story), the introduction to the game rulebook sets out the game as having a narrative basis, with a focus on the internal machinations of the Imperium, and that it is designed to allow players and their gamemaster a large galactic sandbox for storytelling, and is not intended to present a balanced competitive experience.

After a good period on release where Inquisitor experienced relatively good popularity when compared with other games outside of Games Workshop’s main franchises (Warhammer 40,000, Warhammer Fantasy Battles), the game has slowly lost both appeal and support from Games Workshop.

For a time articles featuring Inquisitor were commonly featured in Games Workshop’s flagship magazine White Dwarf together with new miniature releases. Partly due to the introduction of Games Workshop's The Lord of the Rings Strategy Battle Game, and the resultant use of the magazine space for articles relating to it, Inquisitor's coverage was later moved to the game's own magazine, Exterminatus. Exterminatus ran for a short period (10 quarterly issues), until Games Workshop grouped all of its Specialist Games range magazines into one larger magazine named Fanatic (for much of its run, Fanatic was solely an online magazine) which was also later discontinued. Together with this miniatures were restricted to online sales only and some have since gone out of production such as the Kal Jerico model. In 2004 the rulebook was made available as a free PDF within the Specialist Games section of the Games Workshop website.

The decline has also been reflected in the game's online support. In 2007 the game's online forum was removed from Games Workshop's servers (although a replacement is now hosted and run privately by fans at the-conclave.co.uk, where it still has a loyal fanbase).

At the same time, a considerable majority of the Fanatic online articles were taken down from the site. No "official" content has been released by Games Workshop since its site redesign, thus any new articles or updates since then have been fan-written.

Production of Inquisitor miniatures by Games Workshop has now ceased and, following a period when the remaining stock was sold off, the miniatures are no longer available from Games Workshop either online or in store.

• Thorpe, Gavin (2001). "Inquisitor Living Rulebook" (PDF). Retrieved March 20, 2006.

• Games Workshop's Inquisitor homepage