Macragge's Honour - Pursuit of the Infidus Imperator: Following the orders of his Primarch, Marius Gage gave immediate pursuit to the Infidus Imperator. While giving chase, three Word Bearers Cruisers turned to intercept the Ultramarines flagship to buy time for the Infidus Imperator to escape. Chapter Master Gage, assisted by Acting Shipmaster Ouon Hommed, opened fire upon the three Cruisers, destroying two of them in the first volley and crippling the third in the second.Kor Phaeron, having survived the confrontation with Guilliman, awoke from his grievous wounds and immediately ordered the Infidus Imperator to come about and face the Ultramarines' flagship. Sensing an opportunity to end the duel, Gage ordered the Ultramarines to prepare boarding parties to capture and destroy the Infidus Imperator from the inside. Leading the assault was Captain Aerion Mersaror and a cadre of Veterans in Cataphractii Pattern Terminator Armour.The two warships met, coming alongside each other. Both vessels unleashed a simultaneous broadside into the other. Gage ordered Boarding Torpedoes fired and docking claws and siege bridges extended, disgorging thousands of Ultramarine Legionaries into the Infidus Imperator.The Ultramarine assault initially went well, quickly gaining ground aboard the Word Bearers vessel, when a build-up of unknown energy was suddenly detected by the sensorum on the Macragge's Honour's bridge. Seeing Chaos Cultists concluding a dark ritual, the Ultramarines realised they had fallen for the Word Bearers' ruse. When the ritual was completed, a large burst of Warp energy wracked both warships, causing severe damage throughout the Macragge's Honour. The ritual also conjured Word Bearers Legionaries and daemons, which materialised within the bowels of the Macragge's Honour, and caused fighting to break out aboard the Loyalist warship.While leading squads of Ultramarines to repel the boarders, Chapter Master Gage came across a Greater Daemon. Realising that they must purge the flagship of the malefic intruders at all costs, Gage and a squad of Ultramarines charged the Greater Daemon in desperation. While the Ultramarines fought to regain control of their vessel, the Infidus Imperator began to break away, shredding the bridges between the two warships.Once he had regained control of his ship, Gage ordered that power be diverted from both the weapons and Void Shields to the flagship's engines in order to pursue the fleeing Word Bearers vessel. Gage reasoned that the Infidus Imperator had neither the time to calculate a Warp jump nor the required distance from the gravity field of Calth to safely translate into the Immaterium. However, Kor Phaeron had another trick up his sleeve.Using the Shard of Erebus, Kor Phaeron sliced a hole in realspace in front of the Infidus Imperator, allowing it to unexpectedly enter the Warp by arcane rather than technological means.  At the protest of Hommed, Gage ordered pursuit of the Infidus Imperator, throwing caution to the wind. Following in the aetheric wake of the Infidus Imperator, Macragge's Honour translated into the Warp.Having successfully jumped into Warpspace, the Ultramarines quickly made a visual identification of the fleeing Infidus Imperator, despite the Navigator of the Ultramarines vessel proving unable to detect the Traitor warship. Once he realised that the Ultramarines' flagship would be unable to track its quarry if it could not maintain a visual on the Infidus Imperator, Kor Phaeron ordered his ship through a shoal of dead suns to try to lose the pursuing Ultramarines.In the course of its pursuit, the Macragge's Honour was suddenly stopped in its tracks by a collision with a Warp anomaly, which resulted in millions of Warp entities attacking the beleaguered Ultramarines vessel. Quickly realising that the Warp anomalies were penetrating the ship's protective Gellar Field, Gage ordered the Ultramarines to the voidlocks to cleanse the daemonic intruders on the hull.In the process of clearing the flagship's hull of daemons, Macragge's Honour lost its visual sighting of the Infidus Imperator. Kor Phaeron launched a vicious counterstrike, which resulted in severe damage to the Ultramarines flagship. Gage ordered the Loyalist starship's weapon batteries charged and loaded, and he fired a broad spread in the hope of hitting the Word Bearers' voidship. However, at the last moment, a contact was detected. Captain Mersaror, having survived the Word Bearers' summoning ritual, activated his homing tracer, providing the Macragge's Honour with a signal that allowed it to finally lock on to the Traitor vessel.Diverting all remaining power to weapons, the Macragge's Honour fired upon the Word Bearers warship, stunning Kor Phaeron and diverting his attack run. In order to ensure that the Infidus Imperator did not survive, Gage ordered a second volley, utterly annihilating the Word Bearers vessel and ending the pursuit. As a result, having suffered tremendous damage during the battle, the Macragge's Honour was left stranded in the Warp. Gage realised that it might take many standard years, even multiple human lifetimes, to return to the Realm of Ultramar. The mighty vessel would eventually do so and be restored to its position as the flagship of the Ultramarines Chapter, but only long after Guilliman had become interred in stasis following the Battle of Thessala in 121.M31 with Fulgrim.