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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]] which 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]].