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In the book series, The Horus Heresy, a great deal about an entity almost certainly the Void Dragon is revealed, called The Dragon of Mars. The [[Emperor]] himself defeated a creature of godlike power who existed on Earth itself centuries ago (What this implies about the Emperor's natural lifespan is uncertain, but [[Space Marines]], his genetic children, do not age normally either) sometime during the 12th century (the text states during the reign of the Emperor Diocletian however, which suggests a date around the 3rd/4th century)³. He traveled to Mars and imprisoned the entity within the [[Noctis Labyrinth]], purposefully not destroying it. The creature is described as having "drunk the heart of stars" and "worshipped as a god", which heavily implies it to be a [[C'Tan]]. It had no name of its own, but the Emperor dubbed it "The Dragon of Mars", and bound it there. Once the warpstorms began and the [[Dark Age of Technology]] ended, the Dragon of Mars sought to claim the red planet by sending out dreams from its imprisonment, teaching the humans there how to build incredibly advanced machines, and in turn, worship those machines. Thus, the Dragon directly created the [[Mechanicum]]. This was in fact the Emperor's plan all along: to create a technologically advanced society that would be able to provide the industrial machinery for his great crusade.

The Dragon of Mars is a being and a location at the same time. It exists beneath the [[Noctis Labyrinth]] in the form of an empty cavern of great size with walls of silver. The room is literally immeasurable, as physical laws warp and bend to the point of being meaningless inside. The air itself is malevolently sentient, and one can feel the hate and anger of the bound god all around them, driving most insane. The Dragon seems only capable of directly communicating to a small lineage of humans via intense visions and grants the ability to control and repair all technology merely by touch. This group, the Children of the Dragon, live one at a time inside the Dragon, called to it by its desire to be free and replacing the previous guardian. The Dragon's power grants them immortality until it passed on, and thus far all have chosen to deny the Dragon its freedom and serve the [[Emperor]] instead by waiting for the next guardian to arrive. It does not appear the Dragon has a choice in whether or not the Children receive its power, but instead they are somehow part of it to begin with.

Dalia Cythera, Guardian during the Horus Heresy, accidentally allowed a book containing the account of the Dragon to be taken from the Dragon's cavern. This book It it said there was later used to prove the Dragon is the [[Machine God]] and his Guardianmuch harm done because of this, not the Emperor, is but this couldn't be unmade when the [[Omnissiah]]. The truth cavern was eventually covered up again by tech priests who realized that having the [[Mechanicum]] turn against the [[Imperium]] would doom both. Of noterecovered and entered ten thousand years later, however, is that the Emperor briefly used one of the Guardian's own powers. It is unknown if this means he is simply so powerful as to be able to duplicate them, or is in fact one of the Children himself41st millenium.³