Ch. 661High-Dimensional War
The Emperor and Horus fought across the Warp and the timeline, using their past, their origins, and the betrayals of the Horus Heresy as weapons. Horus ultimately overpowered the Emperor and raised his weapons to execute him.
- The Emperor and Horus clashed in the Vengeful Spirit, unleashing power that threatened both the Warp and the material universe, while Lox resisted Slaanesh's attempt to tempt him.
- The Emperor trapped Horus in Cthonia and tried to exploit his past, but Horus showed no attachment and destroyed the world.
- Horus attacked key points in the Emperor's history, including humanity's birthplace and the Imperial Palace, while the Emperor restored them and confronted Horus with the betrayals at Isstvan III and Isstvan V.
- Horus accused the Emperor of creating the primarchs through a bargain at Molech and using them as weapons, then the two continued their battle across the timeline.
- Horus returned to the Warp and, empowered by the Chaos Gods, broke through the Emperor's attacks and transformations.
- Horus struck down the Emperor, shattered his armor, and raised the Worldbreaker and Talon of Horus to execute him.