Housed inside the Imperial Palace and kept alive by a life-sustaining Golden Throne, The Emperor of Mankind’s will lives on.
Via our friends at Lexicanum
Enthroned within the life-sustaining Golden Throne, the Emperor’s will has transcended his maimed body. The Emperor is now divorced from the day to day running of the Imperium; this is left to the Adeptus Terra who govern in his name.
Now, his will is interpreted and executed by the High Lords of Terra, his worship is regulated by the Ecclesiarchy, his law enforced by the Adeptus Arbites, his form guarded by the Adeptus Custodes, and his people protected from the horrors of the galaxy and from even themselves by the Inquisition. The Emperor is confined within the Golden Throne, vast biomechanical machinery forming the great Sanctum Imperialis, located deep within the continent-spanning complex on Terra known as the Imperial Palace. There the Emperor’s physical form is sustained by carefully maintained machinery. Physically, the enthroned Emperor of Mankind is a ravaged corpse. The last surviving cells in his shattered body are sustained by the Golden Throne, providing an anchor for the Emperor’s spirit, which extends across the entire Imperium. The Emperor and the Golden Throne continue to function through the daily sacrifice of thousands of Psykers. While his body is sustained, his will endures. His existence is said to be an unending torment, with his every thought enslaved to the task of ruling, guiding and protecting his race. Ultimately it is only his will to endure that allows him to survive, as he knows his death would lead to the destruction of the Imperium and leave mankind without the guidance it needs to survive.
Only through his power can the Astronomican beam its guiding light, allowing Imperial ships to navigate the Warp in relative safety. The Emperor is not just a beacon for space travel, however, but is said to continue to guide humanity through his Tarot, and through dreams and visions given to selected individuals. It is also popularly believed that he created the warp storm known as the Storm of the Emperor’s Wrath during the Age of Apostasy, and that the Emperor’s will holds Chaos at bay. Were it not for his unceasing struggle, the Chaos of the Warp would flood the material realm with madness and horror, causing untold destruction. In addition, the Emperor’s presence on the Golden Throne keeps the ruptured Webway portal beneath the Imperial Palace in check. Should it again open, Terra would become flooded by Daemons.
In addition to these already profound powers, the Emperor is capable of stopping time for undetermined lengths and guiding his servants through manipulation of his Tarot and sheer influence.