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The Pylons are monumental constructions of unknown origins on a number of planets near the eye of terror usually found near the Cadian Gate. They 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. They have a Necron design, 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.
In the final years of their Great War against the Old Ones, the C'tan were losing, overwhelmed by the psychic might of their foes. Using machineries conceived by the C'tan known as the Dragon, the Necrons planned to turn the tides of the war by cutting off the Old Ones from the source of their psychic power: they would forever separate realspace from the warp with unbreakable barrier. Protected by massive warfleets, the Necrons began to construct warp suppresion pylons at key locations across the galaxy such as Cadia - and also in the Cerberus Shroud. This plan was interrupted and the arcane mechanisms never completed. From BFG journal.