Magistus Amon

Amon served as Magnus' tutor before the arrival of the XV Legion on  Prospero, and he became one of the Legion's first Prosperine Astartes at the direct invitation of Magnus. Amon eventually rose through the ranks to become Captain of the 9th Fellowship. He became the founder of the Corvidae Cult and its first Magister Templi. He also served as  Equerry  to Magnus, responsible for the Primarch's security and for officiating certain sorcerous rituals, amongst other duties. Amon would not only survive the battles of the Great Crusade, but those of the Horus Heresy as well, eventually becoming a member of the Cabal of Ahriman and vanishing from recorded history after Ahriman's exile from the XV Legion.

Afthermath of the Rubric

As Ahriman was exiled,so too his cabal,but Amon was determined to find all the secrets of the rubric and pherhaps restore some of his minddless brothers back to life.Over the years he amased power,gathered ships and aprentices who becamed themselves formidable soccerers.Yet he needed Ahriman for he knew the seecrets of the rubric.Meanwhile Ahriman was on the run with a small band of chaos space marines which treated him like a scum,just an petty soccerer.Eventualy one of Amon's soccerers found him,but Ahriman was more powerfull than them all combined and escaped with a few still loyal spacemarines on theyr ship whitch had been captured by the chaos space marines prior to this engagement.

Face to face

Ahriman eventualy camed face to face with Amon,he revealed some of the secrets of the Rubric,and eventualy Amon forgave him for what he had done with his brothers.The two remaining loyal space marines which now looked up to Ahriman as an mentor camed to the rescue and dragged him out o his pittiful state.Whit his new found confidence Ahriman faced Amon in combat and killed him,taking control of his armada o hundreds of rubricae and other mercenaryes.