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|Commanders1 =[[Primarch]] [[Lion El'Jonson]]<br>[[Iron FatherKnight Cenobium|Knight-Preceptor]] [[Lasko MidoaVendrahel]]<br>[[MagosPaladin (Dark Angels)|Paladin]] [[Khir Doth IaxisEnnedreth]]<br><br>[[Knight Cenobium|Knight-PreceptorIron Father]] [[VendrahelLasko Midoa]]<br><br>[[PaladinMagos]] [[EnnedrethKhir Doth Iaxis]]

The '''{{PAGENAME}}''' was a clash during the [[Horus Heresy]]. The battle began when the [[Iron Hands]] ' 98th [[Clan-Company]] led by [[Casalir Lorramech]] fought a [[Death Guard]] task force led by [[Calas Typhon]] to prevent them from claiming a powerful [[Tuchulcha|alien sentience]] on the [[Adeptus Mechanicus]] [[Research Station]] of [[Perditus]]. The [[Dark Angels]] under [[Lion El'Jonson]] eventually arrived to turn the tide.{{Fn|1}}

The main battle began when [[The Lion]]'s forces, acting on intelligence from a nearby [[Astropathic]] message, interrupted the ground battle between the forces of [[Iron Hands]] [[Iron Father]] [[Lasko Midoa]] and [[Death Guard]] [[First Captain|Captain]] [[Calas Typhon]]. The battle lasted 38 days on the planet before the Iron Hands spotted the [[Dark Angels]] making orbit, but they were not able to directly contact them through the comm-dampening. The Iron Hands then prepared to intercept the Death Guard ships in orbit while making an assault to take advantage of the situation, breaching the Death Guard ground defenses defences and taking one of their positions. This provoked Typhon, forcing them into acting while attempting to free the sentient engine known as the [[Tuchulcha]]. As the fighting began to intensify, they were stopped by the command of the Lion who declared the planet under his protection and for everyone to leave; both sides responded immediately and started to retreat. However, Typhon knew that there had to be a reason for the Lion to arrive so he tapped into the warp and the powers of his patron, [[Nurgle|the Father]]. Using [[psychic ]] powers, he determined that the Dark Angels were using their [[librarian]]s to cower the forces and so he used his own to protect the minds of his [[Grave Wardens]]. The Lion responded by ordering [[torpedo]]es to be launched.{{Cite this}}

As Typhon led the charge against the Iron Hands, he was informed that torpedoes were had been launched. This prompted Typhon to order a withdrawal then contacted contact the Dark Angels via [[vox]]. The Lion responded by ordering the Death Guard to pull back except for Typhon and his guards and await a parlay. The Lion landed with 1,000 of his men and he spoke with Midoa, Typhon, and the [[Mechanicum]] directly. The Lion came to High [[Magos|High Magos]] [[Khir Doth Iaxis]], Overseer of [[Magellix]] and Custodian of Tuchulcha, a man of only a meter in height, who then welcomed the Lion to the planet and asked the [[primarch]] to follow him into the facility. The Lion had Midoa and Typhon escorted elsewhere then proceeded to Tuchulcha's chamber.{{Fn|1}}

The Lion was taken to Tuchulcha deep beneath the surface, and he remembered when he slaughtered machine cultists who worshiped Tuchulcha the last time he was there. On the way, the Lion noticed that Iaxis had an [[electoo ]] of a [[Ouraboros]] dragon eating its own tail, which Iaxis said was for the [[Dragon of Mars|Order of the Dragon]], a now defunct organization. Inside the chamber, the Lion found an orb 10.7 meters in diameter of an unknown material, Tuchulcha, and that it was watching him. Unlike before, the orb now had two protrusions, only a few centimeters centimetres in length, from each pole. A small boy [[servitor]] laid before the device with pipes connecting him to the machine, and through it Tuchulcha spoke. The Lion questioned it, surprised at its ability to communicate through the puppet and that it recognized him. The machine said that he was "the everything," was "everywhere," and "once Servant of the Deadly Seas" before becoming "Friend of the Mechanicum." The Lion responded that the machine was dangerous, but was told by Tuchulcha that he could not be destroyed because he did not truly desire to destroy the machine{{Fn|1}}

Tuchulcha then explained that the Lion caused him to be afraid. The Lion questioned how the machine knew of the battles above, and the it responded that his mind was able to touch theirs before saying that the Lion's mind touched him but it carried a heavy burden of guilt. The Lion questioned Iaxis as to the machine's use and why it was spared. Tuchulcha then demonstrated its [[teleportation ]] power, shifting in to into the throne room of the ''[[Invincible Reason]]'' and translated translating the whole ship into the [[warp]]. This prompted alarms to go off, and the act both appalled and surprised the Lion. The Lion questioned Tuchulcha how translation was possible being so close to the system's star, and Iaxis responded that the machine didn't have to worry about such concerns. The Lion decided that he had to be friends with the machine, and asked it politely to return them to real space around the planet.{{Fn|1}}

[[Corswain]] and the Lion discussed the nature of the situation and the parlay in his chambers. The Lion could not tell what Typhon's full agenda was, and he was unsure why the Iron Hands arrived and their legion was not as inconsequential as he once assumed. The [[primarch]] then met with the two commanders, where Typhon immediately verbally lashed out and was chastised. The Lion did not yet decide what to do and questioned them as to their purpose. Typhon responded that he came for the warp device to give to Horus, and then stated that it was expected that the Dark Angels would battle the [[Night Lords]] but would eventually come to [[Horus]]. The Lion responds responded by pointing out that Typhon does did not mention [[Mortarion]], and that Typhon served his own ambitionambitions. Additionally, it was not Horus who ordered Typhon there, and that Horus would not wish direct war with the Dark Angels.{{Fn|1}}

The Lion then turned to Midoa and questioned his purpose. Midoa explained that he was part of the [[406th Expedition Fleet ]] and was not part of the [[Drop Site Massacre]]. 6 months ago, they met with the [[Ultramarines]] at [[Ojanus]] , then were dispatched by [[Guilliman]] to protect Perditus and the device from traitors. Midoa then said that he believed it should be taken to [[Macragge ]] to be safe. Hearing both sides, the Lion then ordered that the planet be destroyed, which brought protest from both commanders. The Lion then pointed out that he too received a summon summons from [[Guilliman]] but that he did not trust the other primarch before sending the commanders off.{{Cite this}}

Midoa left for the ''[[Fastidious Prosecutor]]'' and Typhon for the ''[[Terminus Est]]''. [[Fiana ]] contacted the primarch to say they felt something burrowing through the warp to the planet. At the same time, the ''Invincible Reason'' prepared for combat as Typhon warped from the ''Terminus Est'' down to Tuchulcha's chamber. Once there, Typhon slaughtered the adepts and [[skitarii]] but was slowly feeling the effects of warp rotting his insides. Calming it, he entered the chamber and was about to kill a robed adept when the puppet asked him not to do so. The boy then told Typhon that there wasn't much time as the Lion arrived. Typhon offered Tuchulcha freedom but was laughed at in response, saying he was waiting for the Lion's return before forcing Typhon to be teleported back to the ''Terminus Est'' with his remaining men.{{Fn|1}}

Later, when Typhon was alone, he reflected that he failed in his mission, but realized that he did succeed when he noticed that he received a [[Mark of Chaos#Mark of Nurgle|3 blister mark]] of favor. On the Iron Hands's ship, Midoa told Lorramech that the Lion had a message for Guilliman: "I am coming." On the ''Invincible Reason'', Tuchulchas and Iaxis were aboard and the planet destroyed. He knew that he had a power that would turn the Thramas Crusade and that [[Konrad Curze |Curze]] would soon be his with some careful planning, and he spoke to [[Watchers in the Dark|a shadow]] that could not be heard in response. He also expressed his concern that Guilliman was either misguided or a traitor, and that none could inherit the title Emperor. Ultimately, only mutual annihilation could prevent further war. The small, robed creature appeared from the shadow, and the Lion told it that it was too important to stop the conflict instead of fixing what was taking place on [[Caliban]].{{Fn|1}}

The Battle of Umbral-51 was a sub-campaign of the greater Perditus Theatre. There, the Lion El'Jonson sought to claim the [[Mechanicus]]' relics on [[Perditus]] before the [[Iron Hands]] and [[Death Guard]] did. [[Vendrahel]]'s command, which included the [[Order of the Broken Claws]] and the Legion's 79th [[Space Marine Company|Company]], was sent to claim the relics in '''Umbral-51''''s archaeo-vaults. Despite the Primarch ordering them to stand down, the Iron Hands and Death Guard forces there had refused to stop fighting for the vaults. When his forces landed, however, it was the [[Traitor Legion]] that Vendrahel ordered his forces to attack. The Death Guard then began to overwhelmed, when Umbral 51's [[Mechanicus]] would unleash their [[Imperial Robot]]s in order to kill all the invaders. While this led to the Death Guard's forces shattering, their commander and a few survivors were able to escape and raced to the vault's gates. Shortly afterwards, the Dark Angels were finally able to destroy the Imperial Robots and gave chase after the Traitors.{{Fn|3}}

Despite the [[Death Guard]]'s head start, the [[Dark Angels]] reached them before they could open the vaults' gates. The two sides were then facing each other, when the [[Paladin (Dark Angels)|Paladin]] [[Ennedreth ]] stepped forward and challenged the Death Guard's commander to an honor honour duel. The [[Centurion (Rank)|Centurion]] [[Kadus Brekkar]] laughed at this and instead used his [[Chem-flamer]] to reduce Ennedreth's body to ash. This enraged [[Vendrahel]] and the [[Knights Cenobium|Knight-Preceptor]] led the charge against the Death Guard. As their forces clashed, Brekkar fought Vendrahel for possession of the vaults. In the end, though, the Centurion was killed by the Knight-Preceptor and the Death Guard were destroyed as well. After the battle ended, Vendrahel knelt over Brekkar's body and whispered the names of the Dark Angels who had died. After adhering to his [[Order of the Broken Claws|Order]]'s rites of rememberanceremembrance, Vendrahel met with '''Umbral'''s [[Mechanicus]]. The [[Tech-Priest]]s then resentfully handed over their relics, after seeing that Vendrahel bore a seal of the pact between their two factions. Afterwards, the Order of the Order of the Broken Claws deemed Umbral-51 to be too dangerous to be left behind. They then planted clusters of [[Tectonic Bomb]]s and ignited them upon leaving. This buried Umbral-51, its Tech-Priests and countless technological artefacts, under tonnes of metal and rock.{{Fn|3}} ==See also==*[[Battles of the Horus Heresy (List)]]

*{{Endn|3}}: [[Exemplary Battles of the Age of Darkness: The Battle of Perditus Umbral-51]] - , pg. 4