Roboute Guilliman - Terran Crusade: Gathering forces from all across the Imperium who were able to reach Macragge as the Warp grew ever more turbulent in the wake of the 13th Black Crusade, the primarch assembled a massive Imperial fleet to reach Terra, beginning what was later remembered as the Terran Crusade.Leaving Macragge and Ultramar in the capable hands of Marneus Calgar, who was once more placed in overall command of the Ultramarines, Guilliman's crusade fleet was passing near the great Warp rift known as the Maelstrom when it was intercepted by a Chaos fleet led by the Daemon Primarch Magnus the Red and his Thousand Sons Traitor Legion.Magnus had stirred himself from the Planet of the Sorcerers for the first time in millennia in recent days, to assault the Fenris System of his ancient foes the Space Wolves, and now to confront his former brother. The Thousand Sons primarch cast a potent sorcerous ritual that flung the Terran Crusade Fleet into the Maelstrom, with no apparent way for it to escape from the labyrinthine clutches of that wound in reality.With time in the Warp indeterminate, the Terran Crusade wandered from Daemon World to Daemon World within the Warp rift, taking steady casualties from the constant daemonic assaults. All during this time Roboute Guilliman's guilt and frustration began to grow, weighing down his psyche as the Loyalists found it impossible to escape the Maelstrom's clutches.But a beacon of hope came when on one such world Guilliman received a psychic message from the Asuryani Farseer Eldrad Ulthran, now an ally of the Ynnari, which laid out a series of landmarks for the Imperial fleet to follow to escape the Warp rift.But when the much-diminished crusade reached the starship graveyard which marked the passage back to realspace, it was met by another massive Chaos fleet, this time of the piratical Chaos Space Marines known as the Red Corsairs, led by the Lord of Change Kairos Fateweaver.The Chaos forces assaulted every voidship in the Imperial fleet, and Kairos ultimately succeeded in defeating Guilliman by using his psychic powers to wrap the primarch in chains literally crafted from his own guilt. Threatening the immobilised primarch's life, the Greater Daemon forced the rest of the Imperial fleet to surrender.The Terran Crusade found itself in dire straits, brought by Fateweaver's command to a Blackstone Fortress hidden in the Maelstrom by the Red Corsairs, a secret gift from Abaddon the Despoiler. There the primarch and his remaining followers would have rotted for eternity were it not for intervention from an unexpected source -- the Aeldari Harlequins led by the Shadowseer Sylandri Veilwalker and Cypher, the mysterious Fallen Angel who was a sometimes enemy and sometimes ally of those loyal to the Emperor.In return for a promise to bring the Fallen Angel before the Golden Throne, Cypher freed the primarch and his compatriots. With their starships lost to them, their crews sacrificed to the Ruinous Powers, Veilwalker offered another path to Terra -- through the Webway gate that lay at the heart of the massive xenos star fortress.The Imperials forced their way deep into the interior of the Blackstone Fortress, defeating the sudden influx of Khornate and Tzeentchian daemons that barred their way. The last hurdle was represented by the Bloodthirster Skarbrand the Exiled One who directly assaulted the primarch after slaying the heroic Emperor's Champion Marius Amalrich.Guilliman managed to defeat the Greater Daemon in hand-to-hand combat largely because of the wound that Amalrich's Black Sword had left in Skarbrand's fiery hide.With Skarbrand's fall, the Terran Crusade passed through the Webway towards Terra, only to discover that the Labyrinth Dimension was already haunted by Magnus the Red and the forces of the Thousand Sons.As Veilwalker explained that there had long existed a secret exit of the Webway on Luna, the moon of Terra, Guilliman realised that his daemon brother had been waiting for them.As soon as they opened the Webway exit in the Sol System, the Thousand Sons would rush through behind them, unleashing a major Chaos invasion right on Terra's doorstep, allowing Magnus to gain the glory ahead of the Despoiler.But with aid from the Harlequins and other Imperial forces such as the Sisters of Silence and the Imperial Fists, Guilliman and his Terran Crusade survivors managed to overwhelm the Thousand Sons and cast Magnus back through the Webway portal, permanently sealing it so that it could never be used again to threaten the Throneworld of the Imperium.At long last, Guilliman was escorted by the awed defenders of Terra to the Imperial Palace, where the survivors of the Celestinian and Terran Crusades at last went their separate ways. There, he finally met for one full solar day with his father, the Emperor of Mankind, for the first time in ten millennia.Roboute Guilliman stood before the Golden Throne and communed with the Emperor. Through their telepathic interaction, the primarch was disturbed by what had become of his father's mental state. He felt that the Emperor had lost all pretenses of humanity and gave off an overwhelming sense of coldness.The Emperor greeted Guilliman with interest, but as a creator would a long-lost tool, not as a father would with his son. Guilliman feared that the long centuries of suffering had stripped away whatever warmth and humanity the Emperor had once possessed.None know what was said between them, but when the primarch emerged from the Inner Palace, he declared that he was taking up the mantle of the Lord Commander of the Imperium once more.Now the first among equals among the High Lords of Terra just as he had been after the Horus Heresy, Guilliman promised the people of the galaxy that he would assemble the greatest fleet and armies seen since the Great Crusade to take the fight to Chaos ... and revive the Emperor's lost dream of a better future for Humanity.The Era Indomitus had begun.