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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 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}}

Following the battle, the Dark Angels would pursue Typhon's fleet as the traitors left a trail of destroyed worlds in their wake.{{Fn|2}}

[[File:Umbral 51.jpeg|thumb|A [[Knights Cenobium|Cenobium Knight]] stands against the [[Mortus Poisoners]]{{fn|3b}}]]

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|3a}}

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 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 remembrance, 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|3a}}

*[[Battles of the Horus Heresy (List)]]

*{{Endn|1}}: [[The Lion (Novella)]],{{Cite this}}

*{{Endn|2}}: [[Vengeful Spirit (Novel)]],{{Cite this}}