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{{SonsOfHorusPortalDarkAngelsPortal}}The '''Treachery at Advex-Mors{{PAGENAME}}''' occurred was a battle of the [[Horus Heresy]]. Fought in 006.[[M31]] during , it is the earliest known engagement of the [[Dark Angels]] in the conflict.{{Fn|1}} ==Overview==The 51st Dark Angels Chapter, known as the Sable Griffons, had been stationed in the [[Rangda System]] since the [[Rangdan Xenocides]]. Eternally vigilant for the possible return of the [[Horus HeresyRangdan]] [[Xenos]], when the 1,500 warriors were met by the [[Sons of Horus]] launched a surprise attack [[Heavy Cruiser]] ''[[Conqueror's Pride]]'' which signaled it needed to claim proscribed resupply. Once in orbit, several squadrons of [[Stormbird]]s and [[XenosStorm Eagle]] relicss headed for the surface of Rangda, the former homeworld of the Xenos. Queries from the Dark Angels regarding their destination were ignored and when [[Praetor (Rank)|Knight-Praetor]] [[Kordray Mordred]] demanded to speak with the Sons of Horus commander, he was met with a sudden and indiscriminate barrage. The barrage left little of the Dark Angels]]' small garrison at fortifications intact yet inflicted only light damage on the chantry house of the [[Advex-MorsOrder of Broken Claws]].{{Fn|1}}==History==The attack beganoutermost defenses crippled, with the Sons of Horus gunships set down and disgorged a full Chapter including a sudden orbital bombardment, which caused the company of [[Dark AngelsJustaerin]] to suffer massive casualties. A [[ChapterTerminator]]-strength s. The Sons of Horus advanced upon their shattered foe, committing only a token force to seize the [[Traitor LegionAstropath]]'s forces ic nexus. The Justaerin [[Consul]] himself tore the Chapter House gate from its hinges and dared the defenders within to come out against him. When none dared to come forth, the Justaerin marshalled their strength and entered the antechamber. At that moment, a great detonated spread across the entrance, causing great damage to the Sons of Horus and trapping them inside. It was then invaded, but that the 12 surviving Dark Angels were able to recover. Soon of the [[Order of the Broken ClawsClaw]]' attacked the nearly 50 Justaerin. Within the pitch-black labyrinthine corridors of the Chapter House the Broken Claw broke the pride of the [[Knights CenobiumWarmaster]] clashed with and when Sons of Horus reinforcements managed to breach the rubble and arrive inside they found a mountain of their comrades corpses. The three surviving Dark Angels withdrew to the lower vaults where the relics of the Rangdan were held in stasis.{{Fn|1}} Their honour besmirched, the elite Sons of Horus refused to resort to simple solutions such as [[JustaerinPromethium]] or [[Phosphex]] and began reaping instead selected the most skilled of their number to launch a direct attack. The first group consisted of veterans but only survived for ten minutes, felling a fearful tally amongst the single Dark Angel defender. Three further bands of Sons of Horusdescended and stilla single Dark Angel stood guard over the guard. However Word then reached the rearguard that the Dark Angels eventually succumbed survivors at the astropathic nexus had driven them from the core and had control of off-world communications. Finally, the Sons of Horus sent in their [[Destroyer Squad]]s. The final Dark Angel gave a last salute before being consumed by Phosphex. The Sons of Horus [[Techmarine]]s were able to scour the Traitor Legionvault for valuable pieces of Rangdan technology, which had been their objective all along. The ''Conqueror's superior numbers and dread weaponry Pride'' subsequently launched a mass orbital bombardment to erase any trace of their attack. One of the grounded Stormbirds was captured and the relics it bore lost to a daring assault by Knight-praetor Mordred and his [[DestroyersDeathwing]]. Even as the lifeguard, while another was shot down and destroyed by [[LoyalistRavenwing]] warriors piloting [[Space Marine Legion|LegionXiphon Interceptors]] sent reinforcements to , though the survivors of the Sable Griffons could not halt the garrison, exodus of the Sons of Horus withdrew from [[Advex-Mors]]. They had succeeded, though, in claiming {{Fn|1}} The remnants of the assault force reached orbit leaving the Dark Angels' proscribed [[Xenos]] relicstrapped below, whose potency but theycould turn spare no time to exact any revenge, for the [[Horus HeresyPromethean Class Cruiser]] in the ''[[TraitorInvidious]]'' had returned, called back from patrol by Knight-Praetor Mordred, and the ''Conqueror'sPride'' was no match for the ancient Terran warship in open battle. Bloodied in body and pride, the Sons of Horus fled the Rangda system. They had come seeking both weapons for Horus' favordesperate rebellion and to break the will of one of the unquestionably loyal Legions but could claim little more than a pyrrhic victory.{{Fn|1}}

*{{Endn|1}}: [[White Dwarf 470The Horus Heresy Book Nine - Crusade]], pgpgs. 101 125- ''Chronicles of the Horus Heresy'' 126