|This article is about the structures on Cadia; for the Necron mobile weapons emplacement, see Necron Pylon.|
The Pylons are monumental constructions of unknown origins on a number of planets across the galaxy that hold back the tides of the Warp.
These structures are one kilometre tall, half a kilometre under the earth and half a kilometre on each side. They have an intricate system on tunnels bored into them, which are impossible to map, as even the smallest servitor never returns from a journey within them. There tends to be a complex arrangement of them across a particular planet, such as those on Cadia.
Made of Blackstone, they are believed to be of Necron design[Needs Citation] and intended to influence the warp in their immediate area, this is thought to be the reason that there is a relative calm area of warp space, now called the Cadian Gate, which is the only safe thoroughfare in the area. Inquisitor Quixos attempted to construct his own in order to further his own Radical goals.
Pylons can be reduced to ruin through overloading them with massive amounts of Warp energy, such as an influx of Daemons. During his Black Crusades, Abaddon hunted and destroyed pylon networks on planets near the Eye of Terror, thereby weakening the barrier between the Warp and realspace. During the 13th Black Crusade, he destroyed Cadia itself, and its pylon network with it. This caused the formation of the Great Rift, which split the galaxy in two.
Some time before 338.M41, the radical Inquistor Quixos developed an interest in the warp-altering properties of the Cadian Pylons, in the hope of permanently closing the Eye of Terror. Controlled through Quixos' enslaved daemonhost Cherubael, a cult calling itself the "Sons of Bael" studied the pylons. These studies bore fruit, and Quixos duplicated the pylons on other worlds using corrupted merchant cartels and personal supplies of Blackstone.
Unfortunately, these plans never came to fruition as he was executed by an Inquisitorial taskforce led by Eisenhorn. It is unknown if Quixos' plan would have succeeded regardless - he was deeply addled by warp corruption and it was well within reason that his experiment could have instead torn the Eye of Terror asunder, which would have resulted in the Noctis Aeterna's devasation and the formation of the Great Rift almost six centuries early.
- 1: The 13th Black Crusade (Background Book), p. 15
- 2: Codex: Chaos Space Marines (6th Edition), pp. 19–20
- 3: Codex: Necrons (8th Edition) pg.11