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|This page contains spoilers for:||Hereticus (Novel)|
Ghül is the chief of the seven worlds raised in honour of the fallen daemon-king Yssarile by a Pre-Dawn daemon civilization that was dead long before the Eldar came to the stars. Fleeing the Warp, this civilization of daemons (the losing side in some form of war) interred their dead king on a suitable world: Ghül. The main population centre was constructed on top of Yssarile's mausoleum and his "barque" or ship (the literal translation of the word is closer to "chariot" or "galley"). Six other worlds were similarly taken over and dedicated to Yssarile. Eventually, the daemon civilisation collapsed and almost all historical trace of them was lost.
Ghül is located in an uncharted star system codified 5213X by the Imperium, 3 months outside of Imperial space. The Imperial Carto-Imperialis code also applies to the world, meaning that Ghül too can be referred to as 5213X.
The world has the strange property of being nearly invisible to visual scanning, giving the impression that it lacks distinct substance. The effect is said to be unnerving to the viewer; Ghül was described by Inquisitor Eisenhorn as "a shadow against the starfield, a faintly discernible echo of matter."
The entire surface of Ghül is covered in deep, perfectly cut and precisely angled trenches all 900 metres deep and 200 wide. This planetary trench/canyon system effectively turns the surface of the world into a gigantic maze. The maze walls are apparently cut with an accuracy level beyond that measurable with an auspex. The maze itself is just a three-dimensional aspect of a much more complicated aspect of the world that allows those with the correct knowledge to seemingly pass through solid walls, all thanks to Ghül's multidimensional nature. The 'interior' or other-dimensional plane of Ghül is known to mirror the surface in general respects, being described as a series of roofless corridors and rooms similarly carved out of black stone and created with precisely regular angles. The main feature of this plane is of course the tomb of Yssarile, said to be so massive and forbidding that the sight of it can unhinge human minds.
The dimensional shift that separates the 'inner' and surface layers of Ghül appears to prevent both vox and psi-communication between planes. Additionally, the world apparently possesses some form of natural ability to generate a suitable atmosphere for visitors.
The heretic Pontius Glaw came to Ghül some time in M41 seeking to obtain Yssarile's barque, pursued by Eisenhorn, fellow Inquisitor Ravenor and an Eldar strike-force led by an unnamed Farseer. Glaw's scheme was foiled, Eisenhorn personally killing the cyborg deviant.