Amon Tauromachian was a member of the first circle of the Legio Custodes during the Great Crusade and Horus Heresy in the 30th and early 31st Millennia. During his long career, he was present at many notable events of the Great Crusade and the Horus Heresy, and would be recognised as one of the greatest of the Custodians.
Amon Tauromachian was present at the Triumph of Ullanor, where Horus Lupercal was invested by the Emperor with the title of Imperial Warmaster and command over all the Imperium's armed forces. While he manned a checkpoint alongside a fellow Custodian, Haedo Venator, as well as seven Null-Maidens of the Silent Sisterhood, the Thousand Sons Primarch Magnus the Red was impressed by Amon's stoicism and dedication and predicted that great things lay ahead for him.
Many Terran years before the start of the Heresy, Amon was also present at the Council of Nikaea to watch over the trial of the Crimson King for his use of sorcery. Whilst protecting Kasper Hawser, a skjald of the Space Wolves, Amon was attacked by a minion of Chaos in the disguise of a Thousand Sons Space Marine, but managed to survive the encounter thanks to the efforts of the Space Wolves Astartes.
Amon was later charged with protecting the Emperor when Terra began the process of fortification to withstand the coming assault on the Throneworld by the Warmaster Horus and his Traitor Legions. After news of Horus' betrayal at Istvaan III reached Terra, Amon was tasked with taking part in the "Blood Games," a rite all Custodians endured and one which set them against the formidable defences of the Imperial Palace in the hope of improving the Custodians' defence of the Emperor through the exposure of flaws in His protection. After ten solar months, and with great difficulty, Amon was able to successfully infiltrate the Imperial Palace and came within striking distance of his target (presumably the Emperor).
Following his success in the "Blood Games", Amon Tauromachian and a fellow Custodian Haedo Emankon were sent on a dangerous mission by Captain-General Constantin Valdor, Chief Custodian of the Legio Custodes, to gather incriminating evidence on a member of the government of unified Terra, Pherom Sichar of Hy Brasil, who was suspected of treason against the Emperor. When Amon went to confront Sichar, the Imperial Fists Primarch Rogal Dorn intervened on Sichar's behalf and explained to the Custodians that he was, in fact, an Imperial double-agent. But due to Amon's interference, Sichar's cover was now blown. Audaciously, Amon suggested to the Primarch that in the future, all Imperial organisations should share such intelligence to avoid such situations from reoccurring. It was later revealed that one of Sichar's bodyguards -- a member of the illustrious Imperial Army regiment known as the Lucifer Blacks -- was an actual agent of the Warmaster. In a suicide attack, this agent detonated a bomb that killed Sichar. He then attempted to set off another bomb so that it would destroy Planalto Central, one of Hy Brasil's largest hive cities, but was stopped by the timely intervention of Amon.
Amon would go on to be regarded as one of the greatest members of the Legio Custodes. His ultimate fate is unknown.
Like all members of the Legio Custodes, Amon's name was formally awarded for each successfully completed assignment, deeds of valor earned in combat or earned after contemplation of the mysteries. As they live far longer than mortal men, Custodians could accumulate a long list of names during their lifetime. Listed below are (as far as can be ascertained) all the known names earned by Amon Tauromachian:
- Amon - His forename. Possibly his birth name.
- Tauromachian - Not a family name, but one that at least described the occupation of the bloodline that had provided Amon's gene-source.
- Xigaze - The site of Amon's organic birth.
- Lepron - The house of his formative study.
- Cairn Hedrossa - The place where he was first tutored in weapon use.
- Eleven More Names
- Pyrope - Seventeen words into his nomenclature sequence, this name remembered his first live combat, deployed on an orbital station of Terra of that name.
- Several more names
- Leng - Awarded as the ultimate part of his name (at least in the early years of the Horus Heresy) recognising Amon's feat in a Blood Game, which was the place on Terra where he attempted to strike his target.