Back aboard the Vengeful Spirit, Leman Russ had pierced Horus's abdomen with the Spear of Dionysus, briefly awakening the goodness within his soul.
Now, an extremely similar scene was playing out upon Magnus.
The instant the Spear of Dionysus pierced the Crimson King's shoulder blade, Chaos's corruption was dispelled, allowing Magnus to see the true world stripped of Tzeentch's filter.
Magnus's corruption and fall had been almost inevitable, because the Changer of Ways had placed a heavy bet on him long ago.
He had displayed the few benevolent things within the Warp before the eyes of the Prospero native, making him truly believe that the Warp was filled with kind beings.
Magnus had been guided, cultivated, and encouraged to magnify the innocent, arrogant, and self-important sides of his nature.
Even many of the "guardian spirits" summoned in those days had indeed been exceedingly rare benevolent entities, rather than those greedy and evil Warp daemons.
At his core, Magnus was a simple yet prideful man. He quickly realized that everything he had seen, heard, and thought had been instilled in him by some being.
He had believed himself to be an independent thinker, a lone seeker of knowledge, yet in the end, everything he had pursued was false.
In his daze, Magnus saw his father seated upon the Golden Throne.
Among all the primarchs, only he had maintained close contact with the Emperor before they had even recognized one another.
During that time, Magnus and the Emperor had conversed through psychic power, wandering together in search of the Warp's endless knowledge. He missed those days beyond measure.
Now, the Lord of Humanity was doing all he could to suppress the Warp daemons pouring from the breach in the Webway beneath him. Endless pain showed on his face, yet with supreme conviction,