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The '''{{PAGENAME}}''' was part of the [[Dark Angels]] [[Space Marine Legion|Legion]]'s [[Hekatonystika]] [[Orders Militant of the First Legion|Militant Orders]]. It operated during the the [[Great Crusade]] and [[Horus Heresy]], mainly devoted to fighting the [[Rangda]] [[Xenos]].{{Fn|1}}{{Fn|2}}

Formed in the wake of the [[Second Rangdan Xenocide]], this small Order held the only full and complete account of the conflict as well as information on the [[Rangda]]. This detailed catalog catalogue was gathered by [[Firewing]] operators and [[Dreadwing]] units and the Orders warriors were trained to stand against the worst Rangdan bio-forms in combat. During the bloody [[Third Rangdan Xenocide]] they won much renowned at combating the Rangdan warmasters, but after the war and with the alleged annihilation of the [[Xenos]] they dwindled in number. By the time of the Horus Heresy only a few members of the order remained, maintaing maintaining a single station on the ruined world of [[Advex-Mors]] where the Rangda had first appeared.{{Fn|1}}

During the [[Horus Heresy]], the Order's base at [[Advex-Mors]] was the subject of a [[Treachery at Advex-Mors|surprise attack]] by the [[Sons of Horus]]. The Order's [[Knights Cenobium]] reaped a fearful tally from the [[Traitor]]s, before they were slain.{{Fn|2}} As the Heresy continued, the duties of the Order were extended, with small groups guarding stasis vaults containing relics and weapons captured from vanquished foes. Each Knight would vow to prevent these artifacts artefacts from calling into the hands of the enemy, and only in the guardian's death would this oath be broken.{{Fn|3}}

*{{Endn|1}}: [[The Horus Heresy Book Nine- Crusade]] , pg.107

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