Eidolon - Eidolon's Fate: Following the Drop Site Massacre of Istvaan V, Fulgrim and the Emperor's Children Legion were ordered to Mars by the Warmaster. But instead of following his brother's orders, the increasingly mercurial Primarch decided to disobey, and instead ordered his Legion to assault a Mechanicus Forge World known as Prismatica V in the Prismatica Cluster. Unable to deal with his lord's increasingly mercurial temperament as well as the increasing hostility of his fellow senior members of the Legion like Lucius, Lord Commander Eidolon questioned the utility of the Primarch's orders. This proved to be a tragic miscalculation on Eidolon's part. Unable to placate his angered lord, the few words he managed to speak on his own behalf inadvertently provoked the Primarch further. The paranoid, possessed Primarch believed that Eidolon was mocking him and planned to betray him. Quicker than the mind's eye could follow, the Primarch withdrew the deadly Kinebrach Anathame blade from its scabbard and beheaded his once-favoured son. Later, the severed head of the slain Eidolon was passed over the victory wine, the blood dripping from the grisly trophy and allowed to mix with the potent drink which was then shared amongst the senior members of the IIIrd Legion's inner circle.In a moment of remorse, Fulgrim ordered his Legion's Chief Apothecary Fabius to restore the slain Lord Commander back to life. Fortunately, Fulgrim's killing stroke was a clean one, the blow struck with enough force and by a sharp enough blade that there was virtually no tissue damage beyond the exact point of impact. It was a killing blow of perfect precision, one that only a Primarch was capable of delivering. Utilising his skills as a master biologis, the Chief Apothecary was able to reconnect the nerve clusters at the base of the neck.Unfortunately, Eidolon would live with pain like no other, driving the Lord Commander mad with joy. Every instant of life given to him would be spent in a symphony of pain and pleasure. Forever after, he would be referred to by his brothers simply as "The Risen." But after his ministrations by Chief Apothecary Fabius and his "miraculous" rebirth, Eidolon's body was an unpleasant collection of jerky tics and awkward movements. Fulgrim thought the Lord Commander's walk was ugly and foolish, and that he moved like a Greenskin. The very sight of the Risen offended his eyes, therefore he ordered the Lord Commander to stay behind him until he could perambulate with some grace. The Primarch believed that the fault lay with Fabius and his imperfect work. He would later punish the Apothecary for making Eidolon stupid and ugly.Despite Eidolon's apparent death at the hands of his Primarch, Imperial authorities are still unsure as to Eidolon's current status. Official Imperial records seem to indicate that the Lord Commander was alive at least up until the Battle of Terra at the end of the Horus Heresy. Despite considerable effort, scholars in the service of the Inquisition have been unable to determine whether or not Eidolon survived the Siege of Terra. Unsubstantiated rumours claim that Eidolon has been responsible for hundreds, if not thousands, of gruesome raids on Imperial worlds in the past ten thousand standard years, and have suggested he may have served as a lieutenant to Abaddon the Despoiler, consort to Queen Sylelle and Chaos Champion of the Daemon Prince N'Kari. Yet, no Inquisitor has yet succeeded in locating the source of these rumours, but without indisputable evidence, the Inquisition will not declare Eidolon dead.