Prodigal Sons - Notable Campaigns: Assault on the Athenaeum of Kallimakus (Unknown Date.M32) - After Ahriman cast the great and terrible spell known as the Rubric of Ahriman and was exiled from the Thousand Sons, he recalled the writings of the Remembrancer Mahavastu Kallimakus, the Scrivener Extraordinary and personal scribe of Magnus the Red. When the Horus Heresy began, Kallimakus realised his records were a collection of mystic rites. He feared for his safety and fled Prospero with his works. After the Space Wolves destroyed the Thousand Sons' homeworld, none in the Imperium spared a thought for the missing Remembrancer. For 1,600 standard years Ahriman sought the works of the Remembrancer. He eventually found the assembled books on the world of Apollonia. A priesthood had grown up around the books, guarded by a fanatical sect of warriors. A citadel housed the library of works, called the Athenaeum of Kallimakus. Beneath the citadel, along a fault line protected by mystic runes, the books sat amidst smouldering sorcerous flames. When Ahriman led the Prodigal Sons to claim the books, the wardens of the Athenaeum fought with zealous determination, if little skill. Aided by his fearless and deadly Astartes Sorcerers, Ahriman eventually triumphed after a bitter month-long siege. The sorcerer plundered the writings of Kallimakus, before burning the library to ashes so that only he would hold the secrets it had contained.Raid on Arcadia (Unknown Date.M41) - The Prodigal Sons' most notable action occurred on the Harlequins' library world of Arcadia. Using their sorcerous powers to aid their master, the Prodigal Sons battled both the Harlequins and the Space Marines of the Blood Ravens Chapter. Ahriman had come to plunder the Arcadium Libarium in order to gain access to the fabled Webway so that he could achieve his ultimate goal of finding the Black Library and claiming the secrets of Chaos the hidden Craftworld held within its repositories. Though Ahriman was able to steal several texts from the library and successfully gained access to the Webway, he ultimately failed to achieve his objective, as the Harlequins deceived the sorcerer into mistaking where the Arcadian Webway Gate would lead him.Second War in the Webway (999.M41) - Hidden daemonic spies seeded throughout the Webway draw Ahriman's eye to the Reborn of the Ynnari, for in their resurrection he saw hope for his own fallen brethren among the Thousand Sons Legion. In the wake of Cadia's fall to Abaddon the Despoiler during the 13th Black Crusade, the Arch-sorcerer led a contingent of Thousand Sons into the Webway, there to lay an ambush for the unsuspecting Aeldari forces that were rushing towards Klaisus, the ice moon and last world of the Cadian System where they sought to form an alliance with the Imperial survivors of the destruction of Cadia. Just as the Ynnari were entering the Psychedelta, Ahriman sacrificed nine hundred and ninety-nine captives to Tzeentch to complete his ritual of translocation, shifting him, his warriors and his Daemon thralls to the Ynnari's location. Warpfire, ensorcelled bolts and the flicker of monomolecular blades filled the fractal tunnels as the armies clashed. In the midst of the carnage, Ahriman created a void-like pocket reality outside the walls of the Webway, and into this emptiness he transported the champions of the enemy, the Triumvirate of Ynnead. As Ahriman prepared to wrench the knowledge he sought from his dying captives, Yvraine -- the Ynnari priestess and champion of the partially awakened Aeldari god of the dead Ynnead -- demonstrated the power she could offer by restoring to life a dozen Rubric Marines. The resurrected Thousand Sons were staggered by their sudden awakening, knowing not where they were or who they were fighting, yet they recognised their battle-brother Ahzek Ahriman whom they had not beheld with living eyes for ten millennia. Filled with a mixture of elation and grief at seeing his warriors restored, Ahriman yanked Ynnead's luminaries back inside the Webway before they perished. No sooner than the Triumvirate of Ynnead --Yvraine, the Visarch and the Avatar of Ynnead, the Yncarne -- were safe, than a Wraithknight sliced through the arcane superstructure of the Webway tunnel, creating a yawning chasm between the Aeldari and the Thousand Sons. The Yncarne inhaled mightily as the Aeldari forces withdrew, pulling the reanimated Thousand Sons over the precipice into the void. Ahriman screamed in horror as these flesh and blood warriors tumbled away. They were lost to him once more, but he now finally knew that the reversal of his Rubric was possible, and he knew who had the power to do it.