Katarinya Greyfax - Horst: Not long after his installation as Lord Commander of the Imperium, Roboute Guilliman summoned Katarinya Greyfax to the Hall of Glories in the Imperial Palace. She found him studying the records of the Inquisition, and he explained that there was much that was not yet understood about the Great Rift, the massive Warp rift that had cut the Imperium in half in the wake of the 13th Black Crusade. The Primarch noted that it was very similar to the Ruinstorm that had been summoned by his brother Lorgar Aurelian during the time of the Horus Heresy, though the Great Rift eclipsed the size and scope of the Ruinstorm by several orders of magnitude.Guilliman explained that in the birth of the Great Rift he had seen a pattern. It was similar to that of the workings of the ancient servants of Chaos such as the priests of Davin, the world where Horus had first been turned to the service of the Dark Gods. The Primarch explained that he had followed the spoor of this pattern back through the Inquisition's records, and though he had found no solution to the problem of the Great Rift, he had discovered where to begin looking -- to the era of the Gothic War, almost a thousand standard years before. One of Greyfax's counterparts from that time, Inquisitor Horst, believed that two xenos artefacts were taken from worlds of the Gothic Sector just before the start of the Gothic War to aid Abaddon -- the Hand of Darkness and the Eye of Night. Greyfax recognised the names, but cautioned the Lord Commander that Horst was considered a maverick within the Inquisition and that these suppositions were nothing more than undocumented speculation. Guilliman countered, somewhat pointedly, that Horst's speculation was the only real clue they possessed as to how Abaddon seized control of the Blackstone Fortresses in the Gothic Sector during his 12th Black Crusade. The Primarch explained that he needed to know more about what Horst had found.Guilliman ordered Greyfax to go to the Gothic Sector, to the remains of the Cardinal World of Savaven which had been destroyed along with its 14 billion inhabitants by Abaddon's Planet Killer during the Gothic War. Greyfax protested that the secret Inquisitorial fortress that had lain below the cathedrals of Savaven had been destroyed along with the planet and it was unlikely any records remained. But Guilliman believed that Savaven's destruction had been no random accident. It was likely that the Despoiler had learned of the existence of the Inquisition base on that world and that he had deliberately destroyed it to prevent Horst from moving against his plans in the sector. The Lord Commander cautioned Greyfax that he was not sending her to Savaven to recover Horst's records -- she was to bring him the Eye of Night. When she asked about the Hand of Darkness, the Primarch responded only that he had other plans in motion to secure its recovery.Greyfax arrived in the Gothic Sector over the fractured ruins of what had once been the Cardinal World of Savaven in the Imperial warship Malleus Rex. The vessel was commanded by the Justicar Genhain and his accompanying squad of Grey Knights, a necessary honour guard for the Inquisitor as the Gothic Sector had been almost swallowed by the Great Rift. From the moment they took up position over the planetary fragments, Greyfax sensed the presence of an old psychic beacon among the shattered rock fragments of Savaven. Opening her mind to Genhain to boost her already potent psychic abilities with those of the Justicar, Greyfax determined that the psychic trace had indeed been left by Horst, though it contained no message other than an old taste of great haste and fear.Just as Greyfax broke her contact with the beacon, another voidship, a frigate, burst into realspace from the Warp above the fragments of Savaven. Greyfax ordered the Malleus Rex to attack the much less powerful newcomer and destroy it, while she, Genhain and the rest of his squad of Grey Knights teleported down into the ruins of an Ecclesiarchy cathedral on a mosaic-covered rock approximately a half-kilometer across. As soon as the landing party appeared on the fragment of the lost Cardinal World -- the Grey Knights sealed in their Aegis Armour and Greyfax in an armoured void suit -- the Inquisitor sensed that Horst's psychic beacon was stronger and that its source was located somewhere beneath her feet.But the Imperials were not alone. The ruins of the cathedral were also being investigated by Chaos Cultists who had teleported down from the frigate, and whose void suits were outfitted with imagery intended to mimic the forms of daemons who were known to be servants of Tzeentch, the Lord of Change. Greyfax, seeing no point to negotiation, ordered the Grey Knights to eliminate the cultists, who quickly fell to their Storm Bolters and Nemesis Force Halberds and to Greyfax's use of her potent Aura of Oppression ability. The few remaining cultists were ultimately purged by the flames of one Grey Knight Battle-Brother's Incinerator.With the cultists eliminated as competition for whatever lay beneath the ruined portion of the cathedral, Greyfax and her Grey Knights proceeded down a flight of winding stairs into the devastated structure's undercroft, where they discovered that a portion of it was protected by a force field that sealed in a breathable atmosphere. Within the breathable bubble of the undercroft was a mausoleum dedicated to the Imperial Saint Carthage, but a sudden psychic pulse from within its walls matching the beacon convinced Greyfax to have the Grey Knights force an entryway through the stone.Within the mausoleum, the Imperials discovered an ornate sarcophagus inscribed with the symbol of the Inquisition on one end. The crypt was otherwise bare. Within the sarcophagus lay an armoured suit, the battle-plate of a Grey Knight Paladin. As soon as the sarcophagus was opened, a psychic blast overwhelmed Greyfax, and to her utter astonishment, the armour within sat up, introducing itself telepathically as Inquisitor Phaedus Falconet Horst! But Horst was no longer alive; he removed the Paladin armour's helmet to reveal an undead, fleshless skull with glowing eyes, the jaw working silently as he communicated mind-to-mind.Despite her distrust of Horst's undead form, Greyfax explained to him how the galaxy had been divided by the Great Rift and that the Imperium was under assault by the Forces of Chaos and the xenos as never before. She explained their mission was to recover the Eye of Night as one small step on the road to defeating the foes of the Emperor. Horst proved vague as to exactly how he had come to his present state, claiming no memory of what had happened or for how long he had been trapped in the sarcophagus, though it had been at least several standard centuries. Horst also didn't know the location of the Eye of Night, but he did know who did -- Moriana the Crone, an ancient human seer of the Chaos Gods who saw all that transpired in the Realm of Chaos from her lair within the Eye of Terror. It was Moriana, Horst claimed, who had guided Abaddon to the Eye of Night before the Gothic War and would also know its current location. As Horst finished his explanation, Justicar Genhain recognised the armour Horst was inhabiting as originally belonging to Paladin Bellicus, a Grey Knight known to him. The undead Inquisitor hastily dismissed the Justicar's observation as they had more important matters to attend to, and Greyfax agreed. They had a journey into the Eye of Terror to undertake.