Webway
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An ancient structure, older than even the Eldar, which can be described as a network of highways through the Warp. The Eldar make extensive use of the Webway for travel, as Eldar souls are especially prized by Daemons and Webway travel is less risky. Some parts of the Webway are so large that entire cities can fit in it, like Commorragh.
Unfortunately, only the Eldar have access to the Webway. The Golden Throne was supposed to be an Imperial access point, from which the Imperium could conquer the Webway for humanity (thereby eliminating the need for Warp travel, and striking a major blow against Chaos), but Magnus the Red's ill-fated attempt to warn the God-Emperor of Mankind about the Horus Heresy wrecked that part of the device. To make matters even more Grimdark the Eldar really have no idea how the damn things work. The webway was established by the Old Ones, the Eldar's deadbeat absentee parents who had the gall to go extinct before explaining it to their kids. Fast forward a couple millenia and nobody remembers the routes, and even if you do there's pretty even odds the tunnel has been compromised by the warp and infested.
So, basically, the eldars use it as the Matrix (on a Craftworld's scale, it's even called the Infinity Matrix) for their dead, and otherwise, it's like the Warp, but (slightly) more stable.