The Adeptus Mechanicus, whose individual members are known as [[Techpriest]]s, own dozens, maybe hundreds of heavily polluted planet-factories known as [[Forge World#Planet|forge worlds]], which are covered in massive manufactoria or, as they are known to speakers of Low Gothic, 'work'. The largest forge world of the Adeptus Mechanicus is its homeworld [[Mars]], on which the most badass weapons ever known to man are made, most of which they refuse to share. Despite being part of the Imperium, the AdMech was actually its own nation and a respectable superpower in its own right throughout the Great Crusade and largely is to this day. The 'being-part-of-the-Imperium' shtick was a symbolic gesture of goodwill signed by the Treaty of Mars, but was codified when they became the "Adeptus Mechanicus" after their former leader fell to chaos. They still secured quasi-independence and private property rights though, courtesy of [[Awesome|marching an Imperator titan into the senate chamber and holding them at building-sized gunpoint]].
The Adeptus Mechanicus is basically the definition of a Mega-Corporation, or a [[Monopoly]]. They are simply so rich and powerful, and have totally privatized the production and manufacturing of technology for themselves, that they can basically buy the government and its politicians. The Imperium may hate the AdMech for being Heretics, but they have private claim to all the various Forgeworlds, Manufactoria, Mining worlds and Research Stations needed for the production of Imperium war machines. Where else can you even buy a new cellphone or have repair maintenance for your servitors, if not your local Techpriest? Because of this privatized monopoly, the AdMech has become an Empire within an Empire, and can ''possibly'' survive without the Imperium, while the Imperium cannot survive without the AdMech.
They have a monopoly on [http://www.youtube.com/watch?v=2TvN5lCVkRk all the really cool shit for themselves (aside from the overpowered DAOT artifacts in the emperors basement)]—like Titans, [[Ordinatus]], and other wonderful stuff—only letting the Imperials have it when absolutely necessary or if they're threatened personally, with the justification of keeping the good shit away from [[Chaos]] in case an army rebels. They have two armies of their own, which are not anything like the [[Imperial Guard]], as they are mostly composed of badass angry technogrunge cyborgs that are more violent than ED209, [[Servitor|lobotomized minions]] manufactured out of clones and heretics, and [[Titan (Warhammer 40,000)|giant, world-devastating Super Robots]]. They are also technological rivals with the [[Tau|space weeaboos with transforming mecha]] and potentially have made a few advances beyond the [[Eldar]], though the Eldar are much more advanced in psionic technology.
They typically look like a cross between [[Star Wars|Jawas]] and [[/co/|Doctor Octopus]] with a healthy dose of [[Dune|The Bene Tleilax]], as well as wearing the sort of re-breather masks that you'll typically see on riot police.
==The Commandments of the Mechanicus==