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Shortly after killing Sanguinius, Horus was confronted by the Emperor. The Much to Horus' annoyance, the Emperor spoke past him and Horus fought with a power instead addressed the Chaos Gods that would have eviscerated any mortal man dozens of times over with each blowhad arrived to witness the final struggle, defying them. {{Fn|30a}} In the ensuing struggle Horus, fully empowered directly by The Emperor held back for much Four Gods of the battleChaos, remembering Horus as his beloved son and not wishing was able to believe overpower the Emperor after a titanic clash that he had turned so utterly to Chaostranscended both space and time and spread across several dimensions. This allowed {{Fn|30b}} Horus to inflict crippling mortal wounds on the Emperor, since nothing short of nailed the Emperor's full power would be sufficient broken but still-living body to defeat him. At a 5th throne he had constructed alongside those for the critical point in the battleChaos Gods, declaring that he was a lone God and would make the Emperor his puppet-slave as punishment.{{Fn|30c}} However Horus was interrupted first by the [[Adeptus CustodeCustodian]] guard entered the room (while others state the lone warrior to be [[Caecaltus Dusk]] and then [[Ollanius PiusPersson]], an contemptuously killing both.{{Fn|30c}} Horus was next confronted by Garviel Loken, his former son who made it aboard the ''Vengeful Spirit''. Loken pointed out that the Emperor had rejected to fully drink from the warp to become the [[Imperial ArmyDark King]] soldier)and that Horus was the one being controlled by the Dark Powers. Loken appealed to Horus flayed ' pride, convincing him alive to briefly shed off his tremendous Warp powers and finish the Emperor as a mere Primarch. Horus, perhaps in his arrogance, agreed to do so since the battle was over anyway. Horus briefly cast off the powers of Chaos and crushed in the Emperor's skull with ''Worldbreaker'' as the Chaos Gods and Daemons around them angrily shouted and protested, trying to warn Horus of something. Horus ignored them but was shocked to find that this was simply a look ruse by the Emperor. Loken and in that instant the Emperor realised how far his favoured son 's corpse had fallenboth been illusions, and the real Emperor launched one last assault upon Horus. {{Fn|30d}} The sacrifice Emperor used the power of the Custodian bought the Emperor time reactivated [[Astronomican]] to shine its light directly into Horus' brain. Horus Warmaster fell into agony as he desperately tried to deliver a finishing blow cloak himself in Warp power once more. However much to Horus. With iron resolve' horror, he gathered his full strength and delivered discovered that the Chaos Gods were now teaching him a massive psychic blow lesson of sorts by deliberately denying him their power. Horus came to the realization that killed Horus almost instantly he had never been in control, and obliterated his very Chaos masters were treating him as they would a disobedient slave. The realization combined with the brief absence of Warp corruption over his soulsaw the old Horus the Emperor had once loved manifest once more. In his final moments, Horus pleaded with the Emperor to kill him before the powers of Chaos were driven from him Gods could fully reassert control. The Emperor initially hesitated, but granted Horus a mercy and stabbed His son through the chest with the [[Athame]] blade Ollanius had given him. The Emperor sensed his favoured sonthen channeled all of His might into the blade, obliterating Horus's return form and reducing him to sanity for a fraction of a second before he finally diedmere skeleton inside charred armour. His body was watched over by the real Garviel Loken, who was heartbroken over the tragedy.{{Cite ThisFn|30d}}

After the battle, the warship ''Vengeful Spirit'' was won back by the forces of Chaos led by [[Ezekyle quickly placed under Abaddon]], Captain of the 1st Company's command. Abaddon found Horus's body and ordered the retreat into the [[Eye of Terror]]. The body of Horus is said to have been put on display in a temple, the Sons of Horus revering the Warmaster even in death. The [[Daemon|Neverborn]], on the other hand, remembered Horus not for his victories but his failures, referring to him as the Sacrificed King.{{Fn|15a}}