Not only the four Dark Gods, but even lesser gods such as Malice and Vashtorr were stunned.
Well, well, you bushy-browed old Emperor! Ruler of the Imperium of Man, overlord of the largest territory in the Milky Way Galaxy, seated upon the Golden Throne, your mind reaching throughout the Warp, and yet...
You actually stooped to sneaking, stealing, and robbery!
Twice. This was the second time!
No wonder people always said grandparents spoiled their grandchildren. The Blood Ravens learned it from you, didn't they? The Carcharodons learned it from you, didn't they? The Crimson Tide learned it from you, didn't they?
The raging chaos in the Warp manifested in reality as... an enormous Warp Storm.
The Emperor's movements had deceived almost all his enemies. Vast amounts of psyker power poured into battlefields throughout the galaxy, with the power surrounding the Lord Regent especially strong, preparing for a war involving four Primarchs.
His incarnation had also appeared in the mortal world, walking among humanity amid violent, unstable psyker power. The Adeptus Custodes had found him and placed him under heavy protection.
The Warp watched that body warily. The sacred radiance emanating from it scorched everything of Chaos.
But... who told you there was only one?
They were twins, a special pair with linked souls. Like Aeldari Titan pilots, they were brothers who shared a telepathic connection, something usually found in twins who awakened their psyker powers at the same time.
When the Emperor descended into one brother's soul, what appeared on the Warp level was that his raging psyker power had torn the other brother apart, mingling his soul into a medium through which he entered the first brother's soul.
In effect, a sacrifice for the Emperor's divine intervention.
In reality, however, the power the Emperor had expended far exceeded anything