Created by the Endless the dust are Nano-machines and Nano-computers designed to maintain their society. Some used these infinitesimally small machines to help maintain their biological bodies, while others used constructs of these Nano-elements -- known collectively as "Dust" -- as virtual bodies once they uploaded themselves. The technology was sufficiently advanced to self-replicate itself and self-assemble. While individual motes of Dust had very limited computing power, the ability to "talk" and network was built in. As a result, "clouds" of Dust could form extremely sophisticated systems. Two versions of the dust the first is manipulating the physical world: Improving building and transportation systems, attacking crop diseases, cleaning and sterilizing living spaces, etc. The other was to Dust to aid in communication and transport. It was refined to provide virtual bodies, pass electronic signals, collect and store energy, etc. But after the fall of the Endless civilization much knowledge on who to use the dust was lost. But some of people can become infected by the dust allowing them to gain supernatural powers

Electoos are metallic strips bonded sub-dermally to enable Tech-priests to channel limited amounts of energy; an extreme example are the renowned Electro-priests, who turn themselves into crackling founts of electricity in battle. Electoos enable the user to directly absorb electricity from equipment or power sources and then expel it, with sometimes devastating results.

A Machine Spirit is a supernatural, animistic spirit believed by the adherents of the Cult Mechanicus within the Adeptus Mechanicus (and, from that source, by most other humans of the Imperium of Man) to inhabit and control any piece of machinery or technology in existence. The functioning, or lack thereof, of any machine is believed to be the result of its spirit's disposition.