Baleq Uthizzar - Burning of Prospero: When Magnus the Red learned of Horus' betrayal of the Imperium and his decision to give his loyalty to the Dark Gods, he used his own psychic abilities to get a message to the Imperial Palace on Terra by directly contacting the Emperor mind-to-mind, though this ruptured the Palace's considerable psychic defenses and killed thousands of people whose minds were unable to handle Magnus' potent psychic call. But the Emperor refused to believe that His favorite son Horus would ever betray His trust and so He assumed that it was Magnus who had been corrupted by the Chaos Gods since he was once again using the sorcerous powers that had been banned by the Council of Nikaea. Believing that Magnus sought to sow dissension in the Imperium to serve his masters in the Warp, the Emperor ordered the Space Wolves Legion to go to Prospero and bring back Magnus to Terra, so he could give account for his actions. But this was not to be, as the corrupted Warmaster Horus had intercepted the Emperor's communique with Russ' Legion and subtly manipulated their orders. Instead of just arresting the offending Primarch Magnus for his transgressions and bringing him back to the Emperor for censure and punishment for breaking his oath never to use his psychic powers again, Horus changed their orders to read that the Space Wolves were to assault the Thousand Sons' homeworld of Prospero. Magnus had psychically foreseen the Loyalist Space Marines' attack on Prospero, which was eventually carried out by the Space Wolves Legion, elements of the Emperor's Legio Custodes, and millions of Imperial Army troops, all assisted by the Sisters of Silence acting as psychic "blanks" in order to nullify the Thousand Sons' psychic abilities.Magnus had finally understood, after his forced psychic entry into the Hall of the Golden Throne and his direct mental communication with the Emperor, that he had been manipulated by Tzeentch, with whom he had apparently unknowingly consorted with while desperately looking for a way to stop the emergence of the psychic mutations that were threatening to destroy his Legion. While the Primarch was within his sanctum he was confronted by the ancient entity that had granted him the means of saving his Legion from the ravages of the "flesh-change". Unknown to Magnus, this was the Changer of Ways, the Architect of Fate himself. It was the Chaos God Tzeentch. The entity informed the Primarch that this boon was now over and that he had now come to claim Magnus's soul. He showed the Primarch visions of the future, of the Golden Throne and the howling, withered cadaver that sat upon it, its once-mighty flesh blackened and matastasised. This was to be the Primarch's fate. But unknown to Magnus, this was a lie, for the being he had seen sitting upon the Golden Throne was none other than his father, the Emperor. The entity then informed that the Emperor's Wolves were even now coming for him. His anger boiling over, Magnus filled his chamber with billowing flames, burning everything within to cinders. Only the Book of Magnus remained inviolate, its pages impervious to the killing fire.The Primarch had no knowledge of how much time had passed when he heard the crash of his door breaking open. He looked up to see Uthizzar enter his chambers, his youthful features shocked at the devastation he saw within. A squad of Scarab Occult came with him, their visors marred by a single vertical slash that obscured the right eye lenses of their helmets. Magnus had heard that the tradition had become commonplace after the Council of Nikaea, but to see such a visible sign of his sons' devotion was a poisoned barb in his heart. The Primarch ordered the young captain to leave his chambers. Magnus raised a warding hand, his grief threatening to overwhelm him as he thought of all he had seen and all that the monstrous god of the Warp had shown him. Uthizzar staggered as the full force of Magnus' thoughts struck him like a blow. Magnus veiled his mind from the young telepath, but it was too late. Uthizzar knew it all. Shocked at his Primarch's betrayal, he began to leave so that he could warn the rest of the XV Legion of the impending attack. Suddenly a wall of unbreakable force sprang up before Uthizzar and his warriors, trapping them within his scorched and smoking chambers. With regret, Magnus unleashed his baleful powers against his sons, ending their lives.In an act of repentance and sacrifice, and to show his father that he and his Legion were loyal to the end, Magnus did not warn the defenders of the planet or his Legion of the coming Imperial attack; on the contrary, he imposed a psychic veil on the planet so the Thousand Sons would have no clue of the impending assault. He also dispersed the Thousand Sons' Legion fleet far away from Prospero. He knew that Tzeentch wanted the Thousand Sons and Space Wolves to slaughter each other, and he wanted to stop these plans, even if it meant the sacrifice of his Legion and homeworld.Therefore, the Space Wolves' attack on the Thousand Sons' homeworld of Prospero came as a complete surprise. Because there was no warning, the invading fleet translated from the Warp into realspace practically on top of the planet, and quickly destroyed its orbital defences, initiating the great campaign of the Horus Heresy known as the Fall of Prospero to Imperial historians.