Located It is located deep in a hidden area of the [[Webway]] dubbed the [[Tower of Heaven]] that could only be accessed through a portal dubbed the [[Gate of the Ancients]].{{Fn|1a}} Dating back to the ancient [[Eldar Empire]], the engine is capable of manifesting ones demands into physical form while within the realm of the Webway, which is more malleable than the [[Materium]]. It is also capable of summoning the souls of dead [[Eldar]] into slave warriors to fight for the user.{{Fn|1c}}

Upon discovering that the Gate of the Ancients could be accessed by the [[Fist of Russ|Fist of Demetrius]], the [[Dark Eldar]] Lord [[Ashterioth]] intended to acquire the Reality Engine and use it to rule [[Commorragh]].{{Fn|1a}} However , in the end he was slain by a strikeforce strike force led by [[Lord Solar]] [[Macharius]] and [[Space Wolves]] under [[Logan Grimnar]].{{Fn|1b}}

*{{Endn|1}}: [[Fist of Demetrius (Novel)]]: