Sanguinius - Capture and Trial of the Night Haunter: Continuing his obsessive hunt for the elusive Night Haunter over the following two Terran years, the Lion and Guilliman continuously clashed over the policies of the Imperium Secundus, especially in regards to the security of the new realm, and how best to deal with rebels on Macragge that the Lion was certain Curze had stirred up against the new regime.Following the suicide bombing of an Astartes convoy by these rebels, the Lion used his I Legion to establish martial law on Macragge. Certain that Curze was hiding within the rebellious Illyrium region of Macragge, the Lion advocated the use of a massive orbital saturation bombardment of the region to ensure Curze's death. Facing resistance from both the Imperator Regis Sanguinius and Guilliman to the civilian losses this would incur, the Lion instead opted to deploy his Legion's Dreadwing in order to flush out Curze and the rebels.During an attack on the city of Alma Mons, the Lion finally cornered the elusive Night Lords Primarch and the two came to blows. After a brutal confrontation, the Lion eventually emerged victorious, and questioned his brother why he had turned away from the Emperor, to which Curze simply replied, "Why not?" Curze explained that there was a monster in his head that he could not stop. Though he finally had Curze at his mercy, the Lion couldn't bring himself to kill his brother, and instead pummeled him into unconsciousness once more. He ripped Curze's backpack from his battle-plate and lifted him above his head, brutally slamming him down across his knee, breaking Curze's spine and paralysing him. The Lion brought the grievously wounded Night Haunter before Sanguinius and Guilliman to stand trial.A Triumvirate was held, where Curze defended his actions, but refused to admit his guilt. Since each of the Primarchs had been created to perform a specific military function, Curze declared that he was simply acting according to his own nature as the embodiment of terror tactics, and therefore had committed no crimes. The Night Lords Primarch further divided Guilliman and the Lion by accusing the latter of secretly ordering orbital bombardments in direct violation of Guilliman's orders.Enraged at the revelation of his secret maneuvering, the Lion sought to kill Curze, but was halted by the words of Sanguinius. Guilliman then snatched El'Jonson's Lion Sword and broke the blade across his armoured thigh in anger that his brother had sought to go behind his back. El'Jonson was furious at the loss of his blade, but Sanguinius dismissed the Lord Protector and brought an end to the ruling Triumvirate of the Imperium Secundus. The Lion was banished from the Imperium Secundus for his violation of Guilliman's directive against minimising civilian casualties. Taking his leave without further comment, the Lion and his Dark Angels withdrew from Macragge only solar hours later.Standing in the chamber of the Tuchulcha Engine aboard the Invincible Reason, the Lion brooded over the recent events, and questioned his actions over the course of the preceding decades and many of the decisions he had come to regret. As the Dark Angels made their final preparations to depart for their own homeworld of Caliban, the Lion went back to the Tuchulcha Engine's chamber. He then ordered the device to teleport himself and Holguin, "Deathbringer," the chosen Lieutenant of the Deathwing, back to Macragge.As Sanguinius was preparing to execute Curze for his crimes, both the Lion and his lieutenant teleported directly into the chamber and told Sanguinius to halt the execution. As troops entered the room, demanding that the Lion surrender, El'Jonson explained his reasons for the intrusion. He reasoned that Curze had the ability to see precognitive visions of potential futures, and repeated the Night Haunter's claim that his death would one day come at the hands of an Assassin sent by the Emperor. If this was true, the Lion reasoned, then it was proof that the Emperor was still alive on Terra. Sanguinius knew the Lion's explanation rang true, as he recognised that his own precognitive visions of his inevitable death at the hands of the Warmaster Horus would also eventually come to pass. When Guilliman demanded to know what would become of Curze, the Lion knelt before his two brothers and promised that he would be Curze's gaoler.