It has also resulted in technological and cultural stagnation, and a regression into tyranny, superstition and religious obfuscation and intolerance that would have horrified the Emperor.

The Imperium’s rule, carried on in the Emperor’s name since the end of the Horus Heresy by the High Lords of Terra and a multitude of Imperial organisations, has been long, oppressive and necessarily harsh. United under one government, Mankind is able to survive the myriad deadly threats it faces from aliens, the Forces of Chaos and the Traitors, Heretics and mutants that lie within the Imperium’s boundaries. Through his Imperium, Mankind is united and remains one of the most powerful intelligent races in the Milky Way Galaxy as well as its most dominant in terms of both population and territory held. To humanity’s countless trillions across the galaxy-spanning Imperium, He is nothing less than God. The Emperor chose to sacrifice His immortal life at the end of the Horus Heresy in the service and protection of Mankind. Although once a living man, His shattered, decaying body can no longer support life, and it is kept intact only by the cybernetic mechanisms of the Golden Throne and a potent mind itself sustained by the daily sacrifice of thousands of lives. He has sat immobile, his body slowly crumbling, within the Golden Throne of Terra for over 10,000 standard years. The Chaos Gods and the daemons of the Warp refer to Him as ” the Anathema“ for He is the greatest embodiment of universal Order in the galaxy today. The Emperor of Mankind is the immortal ruling monarch of the Imperium of Man, and is described by the Imperial Ecclesiarchy and the Imperial Cult as the Father, Guardian and God of humanity. “ The Emperor Protects…'- The Lectitio Divinitatus

Emperor of mankind vs horus