The Adeptus Mechanicus is the official Imperial name within the Adeptus Terra for the Cult Mechanicus or Cult of the Machine. In ancient times, before the current Age of the Imperium officially began following the end of the Horus Heresy, it was often called the Mechanicum. The Mechanicus acknowledge the Emperor of Mankind as the ruler of the Imperium of Man, but not the religious truth of the Imperial Cult or the Ecclesiarchy. Instead, the Mechanicus follows its own dark and mysterious scriptures and worships the deity they call the Machine God or the "Omnissiah." The Adeptus Mechanicus believes knowledge is the true manifestation of divinity in the universe, and all creatures and artefacts that embody knowledge are holy because of it. The Emperor is the supreme object of worship for Mankind, the living embodiment of the Machine God or Omnissiah, because he comprehends so much, understanding more about the true nature of reality than any other being in existence. The Adeptus Mechanicus also regard organic flesh as weak and view the removal and replacement of biological tissue with mechanical, bionic parts as sacred. Most elder Tech-priests have few organic parts left and eventually become more machine than man. The Adeptus Mechanicus is based on Warhammer Mars, the very first Forge World of the Imperium, and they are the sole rulers of the Red Planet. They provide the technical and scientific experts of the Imperium and field armies of massive Titans, Mechanicus Electro-priests, Skitarii and combat Servitors.
Standard template construction (STC) are given to rare weapons and vehicles used by the Imperium of man, while many can only be be produced on certain Forge worlds over the course of the first multiverse war many new xenos technologies from more advanced races and many of the POL universe weapons were extensively recorded and immediately put under production, some STCs have either been stolen or asked although the Adeptus Mechanicus doesn't care what costs it takes to acquire this technology. While some of the newer STCs have been lost in large data vaults never to be seem again a vast majority of other STCS have been widely produced along with many POL universe weaponry and vehicles. Many of these STCs have kept the technological stagnant Imperium of man alive and had in fact help the Imperium of man research new tech allowing the Adeptus Mehanicus to turn the wheels of progress yet again.