Anathame - Corruption of Horus: The Word Bearers' plot reached its climax on the Plague Moon of the Feral World of Davin, where Horus was wounded during a struggle against Eugen Temba, the former Imperial Planetary Governor of Davin who had rebelled against the Imperium following his corruption by Chaos. The Anathame that had been stolen by Erebus from the museum of the Interex had been given by the corrupted Chaplian to Temba. Temba had been corrupted by the powers of the Warp and had become a mutated servant of Nurgle, the Chaos God of disease and decay. During a confrontation on the Plague Moon in the ruined remains of Temba's Imperial warship that was orchestrated by the Word Bearers' First Chaplain, the corrupted Temba managed to seriously wound Horus with the malefic blade by stabbing the Primarch through his left shoulder. When the Luna Wolves found the wounded Primarch, the Mournival moved the Warmaster to the Medicae aboard the XVIth Legion's flagship, the Vengeful Spirit.The Apothecaries of the XVIth Legion proved incapable of healing the Warmaster's wounds despite every form of advanced medical technology at their disposal, until it seemed that Horus would surely die. The Luna Wolves' notable Apothecary Vaddon examined the Primarch's wound, discovering that the fell weapon's toxins rendered even Horus' superhuman immune system powerless in the fight against them. His Larraman Cells were no longer functioning correctly, and so the open wound could not clot properly, causing Horus to bleed profusely. Vaddon informed Captain Garviel Loken of his findings, explaining that in order to save the Warmaster, he needed to examine the weapon that had wounded him. Captains Loken, Tarik Torgaddon, Sergeant Nero Vipus and members of the Luna Wolves' Locasta Squad went back down to the surface of Davin's moon to retrieve the Anathame.Erebus then convinced the Luna Wolves' warrior lodge to allow him to take Horus to a secret sect on Davin and use the sorcery practiced by the Temple of the Serpent Lodge to treat the Warmaster. The creation of a warrior lodge within the Luna Wolves and many other Space Marine Legions over the course of several decades based on the lodges used by the savage warriors of Davin had been another of the Word Bearers' ploys to infiltrate and corrupt the Astartes into turning against the Emperor. Following the "miraculous" recovery of Horus on Davin after he turned to the service of Chaos and dedicated himself to overthrowing the Emperor in return for his resurrection, the Anathame was mysteriously taken away from Apothecary Vaddon by the Emperor's Children Chief Apothecary Fabius. Fabius bore the Warmaster's Seal, which enabled him unlimited access to any artefacts he required. Fabius then delivered the weapon to his Primarch Fulgrim, which Horus had arranged as a gesture of trust. Shortly before the Istvaan III Atrocity, Fulgrim used the Anathame to kill Lord Commander Vespasian.He later used it to kill Remembrancer Ostian Delafour in his studio aboard the IIIrd Legion's flagship, the Pride of the Emperor, impaling him through a painstakingly-sculpted statue of the Emperor of Mankind that offended Fulgrim's new Chaos-tainted sensibilities. Fulgrim left Ostian and the Anathame, where Serena D'Angelus would later kill herself on the protruding blade. Fulgrim later reclaimed the blade, but he allowed Erebus, the First Chaplain of the Word Bearers Legion, to strike eight shards from the Anathame just before the Battle of Calth and fashion them into the Chaos-tainted daggers known as Athame. He gave seven of the Athame to the commanders of the Word Bearers Host deployed to  Calth, including Kor Phaeron, Morpal Cxir, Foedrall Fell, Hol Beloth, Quor Vondar, Phael Rabor, and Kolos Undi. Erebus also gifted an Athame to Criol Fowst, a human leader of the Chaos Cult known as the Brotherhood of the Knife that was in service to the Word Bearers at Calth. Fowst used his Athame to sacrifice victims as part of the Word Bearers' summoning ritual during the Battle of Calth. He considered it his most treasured possession, and was enraged when he lost it to Oll Persson. Persson later used this Athame to cut a rift in realspace which allowed him and a small group of survivors to escape the poisoning of Calth's atmosphere.The Anathame eventually returned to the possession of the Emperor's Children Chief Apothecary Fabius and he learned how to influence its daemonic sentience. When Felix Cassander broke free of his restraints and attacked him in his vivisectorium, Fabius took the Anathame and named Cassander to it, and then struck a glancing blow to Cassander's shoulder. Instead of dying, Cassander was wracked with pain beyond that which even Fabius had ever inflicted upon him.Fulgrim ultimately brought the Anathame with him to Iydris, a Crone World at the heart of the Eye of Terror, and used it to ascend to daemonhood in accordance with the Eldar prophecy regarding the forbidden weapon known as the Angel Exterminatus.