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Amon Tauromachian

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Targetdrone.gif This article is about the member of the Legio Custodes; for the Thousand Sons Captain, see Amon.
Amon Tauromachian[4]
This page contains spoilers for: Horus Heresy (Novel Series)

Amon Tauromachian was a member of the first circle of the Legio Custodes during the Great Crusade and the Horus Heresy.[1b] He was regarded as one of the greatest members of the Custodes.[1b][2]


Amon was present at the Ullanor Triumph, manning a checkpoint alongside fellow Custodes Haedo Venator and seven members of the Silent Sisterhood. Primarch Magnus of the Thousand Sons was impressed by Amon's ability, predicting that there were 'great things ahead for [him]'.[2]

He was also present at the Council of Nikea. He was one of a group who explained to the skjald Kasper Hawser that he was a spy sent by the Thousand Sons to infiltrate the Space Wolves.[3a] He was then assigned to guard Hawser and explained the significance of his name.[3b] However, at that point he was being controlled by a Daemon posing as Captain Amon of the Thousand Sons, the similarity in their names making the task easier. The level of control the Daemon had over him meant that he was unable to take part in the subsequent fight, a fact that he regarded as failure.[3c]

At some point during the Horus Heresy Amon took part in a Blood Game. Ten months after it began he was able to infiltrate the Imperial Palace and came within striking distance of the target, presumably the Emperor.[1a] He then took on an assignment to investigate Pherom Sichar of Hy Brasil, who was suspected by the Custodes of being a traitor to the Imperium. He was about to arrest Sichar when Rogal Dorn intervened and revealed that Sichar was a double-agent working for the Imperium, but had now had his cover blown. Amon suggested that all Imperial organisations should share information to stop this happening again.[1c] One of Sichar's bodyguards - a Lucifer Black — was a real agent of Horus and detonated a bomb that killed Sichar. He then attempted to set off another bomb that would destroy the Planato, but Amon was able to stop him.[1d]

During the Siege of Terra Amon was tasked by Constantin Valdor with investigating supposed Daemonic activity within the Imperial Palace. His investigation led him into the refugee camps of the Inner Palace, where he met Euphrati Keeler.[5] Amon expressed great distrust for the future Saint and her followers, but was ultimately told by Malcador to tolerate their presence in order to potentially use their faith in order to combat the powers of the Warp.[5a] However the Nurgle Daemon Cor'bax Utterblight was unleashed into the palace, heralding with him a swarm of Possessed Imperial cultists. With the aid of Keeler and Malcador, Amon was able to defeat Utterblight. For his works and future status as a warden of Keeler's Cult, Malcador recommended that Valdor award Amon a new name, Longinus.[5b]

Later in the Siege, Amon was assigned to oversee Keeler as she resumed her role as a Remembrancer and interviewed the infamous criminal Basilio Fo. When Fo revealed a contagion capable of killing not only the traitor Primarchs but all Space Marines, Amon agreed with Keeler's assessment that the data should be provided to Rogal Dorn.[6] Later Amon and Keeler again meet with Fo, this time recording everything he will say regarding the transhuman virus.[6a] Amon later hunted Fo after his escape, but the mad scientist eluded him and forced Constantin Valdor to apprehend him personally.[7]

After Valdor captured Fo again, he was handed back to Amon's custody. During the final hours of the Siege as Valdor, Dorn, and the Emperor are off fighting Horus aboard the Vengeful Spirit, Amon receives a summons to hand Fo over to Custodian Wardens. As Amon escorted Fo to what was likely execution, the mad scientist ground away at Amon's confidence in the order by questioning its validity. As Amon was about to hand over Fo to the Wardens, Fo was able to get his would-be executioners to admit they could not confirm the validation of their custody order. This caused the two sides to nearly come to blows, and Amon stormed back off with Fo until such a time that the execution order could be affirmed. Amon then ran into Zaranchek Xanthus and Andromeda-17, who accompanied him to an office of the Sigillite.[8b] Amon, Fo, Xanthus, and Andromeda-17 next journeyed to the Sigillite's Retreat to use Malcador's lab to create a perfected version of his bio-weapon that had no chance of mutating to also infect non-Astartes.[9]

Soon enough, even the Sigillite's retreat began to be overrun by Chaos forces. Thinking all other options expended, Amon was about to activate Fo's weapon until he was interrupted by Ios Raja and Khalid Hassan, who overruled the order. Later, Amon seemingly executed the escaped Basillo Fo[10a] but was unaware that he had taken on the identity of the cloned Zaranchek Xanthus. Amon was one of the Custodes who survived the Siege of Terra.[10b]


Like all Custodes, Amon Tauromachian's name was formally awarded to him and grew longer as he successfully completed more assignments. His full name (as far as it is known) is written below, complete with a explanation of what each component signifies.[1b]

  • Amon: unknown, possibly birth name
  • Tauromachian: describes the occupation of the blood-line that provided his gene-source
  • Xigaze: site of his organic birth
  • Lepron: house of his formative study
  • Cairn Hedrossa: where he was first tutored in weapon use
  • ten more words
  • Pyrope: name of the orbital where he had his first live combat
  • presumably other names
  • Leng: part of the Imperial Palace where he attempted to strike his target during the Blood Game
  • Longinus: named after defeating Cor'bax Utterblight and overseeing Euphrati Keeler's Imperial Cult.[5b]