Aldrik Voldus - Terran Crusade: After his confrontation with Grand Master Voldus, the primarch announced his intention to set out upon a great journey. Once before during the Horus Heresy, when the Dark Gods had threatened the Imperium of Mankind, the Primarch of the Ultramarines had reached Terra too late to do his duty. He would not make that mistake again. Guilliman intended to journey to Terra, to kneel at the foot of the Golden Throne and ask his father for guidance.Conscious of the worsening Warp Storms lashing the space lanes of Ultramar, Guilliman announced his intention to make for Terra as soon as a suitable force could be assembled. The primarch would not travel alone; the galaxy had become a dark and dangerous place, while the attempts by the Chaos Gods to tempt and trick him had shown Guilliman that his resurrection had drawn the eyes of the Ruinous Powers.The war across Ultramar was still ongoing, however, and with Guilliman leaving, it would require strategically gifted warriors to keep pushing the forces of Chaos back. As such, Guilliman gathered a select force of Battle-Brothers from the 1st, 2nd and 3rd Companies of the Ultramarines to accompany him to Terra, and gave the honour of their command to Captain Cato Sicarius. He further requested that Grand Master Aldrik Voldus and the Grey Knights of the 3rd Brotherhood join this Terran Crusade.Others pledged their aid to the primarch's cause, including the assembled strength of the Ultramarines' Successor Primogenitor Chapters, and Emperor's Champion Marius Amalrich and his Black Templars brethren. The Living Saint Celestine, the Inquisitor Katarinya Greyfax and Archmagos Dominus Belisarius Cawl accompanied the primarch also -- whatever aid they or the military forces under their command could provide the primarch would be gladly given. Guilliman gratefully accepted all offers of aid before commanding Marneus Calgar, Chief Librarian Tigurius and Captain Severus Agemman of the Ultramarines 1st Company to remain and lead the continued reconquest of Ultramar.Voldus and his brothers joined the primarch on this Terran Crusade, their combat prowess and unwavering faith aiding the Imperial forces of the Crusade in all their trials and tribulations in the Warp rift known as the Maelstrom after their fleet was cast into the rift by a sorcerous ritual cast by the Daemon Primarch Magnus the Red, who had been tracking his former brother's progress from Macragge.Trapped in the nightmare of the Maelstrom, amidst fluctuating time streams and reality-warping energy storms, the damaged starships of the Terran Crusade struggled on. Within the Maelstrom lurked countless foes, for this was a region that had long harboured the warring minions of Chaos.More than once when trapped in the Maelstrom, the Imperial ships were forced to fight off opportunist raids by sleek hunting packs of Traitor warships. Amidst a thousand-mile-wide cloud of corrosive spores, the Terran Crusade ships found themselves beset by swarms of vast plague flies as large as frigates. The monstrous insects took a savage toll upon the smaller ships of the Crusade, until Saint Celestine took to the Navigator's observation blister of the Ultramarines flagship Macragge's Honour. Unleashing her holy light in a blazing psychic shockwave, the Living Saint purged the hideous daemon beasts from the void.In another uncharted reach, the Terran Crusade craft found ghostly phantasms whirling around their hulls. Howling Warp ghosts screamed through the corridors of the Space Marine craft, swarming around the ancient relics and honoured banners of their Reclusiam shrines. The Adeptus Astartes realised, to their horror, that these aetheric leeches were draining the holy energies from their treasured relics, dragging faint, screaming ghosts from the enshrined helms, blades and scrolls. In this fight, the Grey Knights came to the fore, Aldrik Voldus swiftly splitting his brotherhood and deploying them by rapid teleport strike into his allies' shrines. Fighting alongside the outraged Chaplains who guarded the relics, the daemon-hunting warriors drove the Warp leeches back and banished them to the void.Eventually, the Crusade, with the aid of the Aeldari Farseer Eldrad Ulthran, discovered a way out of the Maelstrom, marked by a massive graveyard of starships. But before they could make their way out of the Warp rift, the fleet was attacked by the Red Corsairs, a piratical group of Renegade Space Marines under the control of the Greater Daemon of Tzeentch Kairos Fateweaver.The Imperials were forced to surrender once Fateweaver used his sorcery to literally entrap the primarch within psychic chains forged of his own guilt and frustration and threatened to slay him. Imprisoned in a Blackstone Fortress that Abaddon the Despoiler had given to the Red Corsairs, the Imperials were freed from what was intended to be permanent captivity by the machinations of the Fallen Angel Cypher and a troupe of Harlequins led by the Shadowseer Sylandri Veilwalker. After defeating the Bloodthirster Skarbrand the Exiled One at the cost of the life of Marius Amalrich, the Imperials successfully fled into the Webway through a massive gate located at the heart of the Blackstone Fortress.But once the Harlequins detected that the section of the Webway they had entered had been infiltrated by Magnus the Red and his Thousand Sons Traitor Legion, Guilliman sensed a trap closing about the remains of the Terran Crusade.Guilliman's mind raced, weaving fragments of fact and glimpses of information with his peerless strategist's intuition. It was Magnus, realised the primarch. His manipulative brother -- who must have somehow known precisely how matters would play out for Guilliman -- had sent his cursed sons to intercept the Imperials.Events began to fall into place in Guilliman's mind. Magnus had hurled Guilliman's Crusade into the Maelstrom not to destroy it, but to weaken it. He had propelled the Lord of Ultramar onto a particular path of fate that Magnus had either hoped or known would lead him to his capture, incarceration within that very specific gaol, and eventual escape into this section of the Webway. Guilliman could not know that the Crimson King had called upon his greatest champion, the Chaos Sorcerer Ahriman, to aid him with his stolen knowledge of the Webway's paths, but otherwise the primarch's conclusions were entirely correct.Swiftly and earnestly, Guilliman sought the counsel of his closest lieutenants. They had to determine what Magnus planned, and quickly, before they stepped straight into the Daemon Primarch's trap. It was Aldrik Voldus who -- drawing upon his knowledge of Titan's ancient libraries -- made the intuitive leap. There was a warded entrance to the Webway within the Imperial Palace. Voldus believed it to be heavily defended, bound shut with the most potent abjurations that the Imperium could muster, but still it existed. Perhaps Magnus knew of that gate, and sought to follow them to it?Guilliman's strategic brilliance leapt ahead again, tracing patterns within patterns and perceiving the truth. Magnus already knew where the gate lay, he realised. There had been whispers that the Crimson King had passed that way before just before the outbreak of the Horus Heresy, and in so doing unleashed the catastrophe that fell upon him and his XV Legion during the Fall of Prospero.Magnus did not need them to lead him to the gate. He sought instead to follow them through it, clearly hoping that the gate's defences would be deactivated to allow for Guilliman's arrival. The Daemon Primarch wanted to strike at Terra, at the very Golden Throne of the Emperor of Mankind, and he hoped to launch his attack as the gate was thrown open to permit the Ultramarines primarch passage.The Terran Crusade, ironically, could not emerge at Terra, Guilliman realised with something like despair, not if it meant allowing Magnus to strike at the cradle of Humanity. Yet Sylandri Veilwalker had never intended for them to take that road. Instead, the Shadowseer revealed a secret that the Aeldari had long guarded.Lying dormant for millennia, hidden behind a veil of wards that even Humanity's greatest psykers could not pierce, a lonely spar of the Webway stretched out upon the border between realspace and the Warp to connect to Luna, Terra's only natural moon. It was through that illusion-veiled gate that the Terran Crusade emerged.But the Imperials were only partially successful. The Thousand Sons and their Daemon Primarch managed to follow them with a portion of their force through the Webway. During the vicious battle that ensued in the dusty void of Luna's surface, with Terra hanging high and bright over the combatants' heads, Aldrik Voldus and his Grey Knights fought valiantly, leading the charge at multiple times against the undying automatons of Thousand Sons Rubricae and uniting their psychic abilities with those of Inquisitor Greyfax to defeat the servants of the Lord of Change.The battle was won when Imperial reinforcements arrived to sweep the lunar surface clear of the Traitors and Guilliman succeeded in hurling Magnus back through the Webway gate while the Harlequins sealed it permanently.Voldus, his brothers and their allies were finally ferried to the Imperial Palace on Terra after the battle on Luna. There, before the Eternity Gate of the Inner Palace leading to the throne room of the Emperor where Guilliman would meet his father for the first time in ten standard millennia, many of the waiting crowd reached out with awe to offer their devotion and thanks to the Grey Knights Grand Master and his brethren.Guilliman emerged a solar day later from the Palace and was soon restored to his former position as Lord Commander of the Imperium. As Guilliman prepared to launch a massive counteroffensive against the gathering forces of the Ruinous Powers, there was no doubt that Aldrik Voldus and all the Grey Knights would stand at his side and face the enemies of the Emperor to their dying breath.