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{{Battle|Name =Treachery at Advex-Mors|Image =|Image caption=|Conflict =[[Horus Heresy]]|Date =006.[[M31]]|Location =[[Advex-Mors]]|Outcome =Traitor pyrrhic victory|Combatant1 =Traitors|Combatant2 =Loyalists|Commanders1 =Unidentified [[Justaerin]] [[Consul]](KIA)|Commanders2 =[[Praetor (Rank)|Knight-Praetor]] [[Kordray Mordred]]|Strength1 =At least on [[chapter]]<br/>''[[Conqueror's Pride]]''<br>Several [[Stormbird]] and [[Storm Eagle]] squadrons|Strength2 =c. 1,500 [[Dark Angels]] (51st Chapter and [[Order of Broken Claws]])<br/>[[Xiphon Interceptors]]|Casualties1 =Heavy|Casualties2 =Heavy}}The '''{{PAGENAME}}''' was a battle of the [[Horus Heresy]]. {{Fn|2}} Fought in 006.[[M31]], it is the earliest known engagement of the [[Dark Angels]] in the conflict.{{Fn|11a}} It was also known as the '''Battle of the Rangda System''', as some chroniclers of the Horus Heresy knowingly or inadvertently misidentified [[Advex-Mors]] as the old homeworld of the [[Rangda]] [[Xenos]].{{Fn|1a}}{{Fn|2}}

==OverviewBackground==The 51st Dark Angels Chapter, known as the Sable Griffons, had been stationed in the [[Rangda System]] since the [[Rangdan Xenocides]]. Eternally vigilant for were among the possible return most catastrophic wars of the [[Rangdan]] [[XenosGreat Crusade]], and brought the 1,500 warriors were met by the [[Sons of Horus]] [[Heavy Cruiser]] ''[[Conqueror's PrideImperium]]'' which signaled it needed to resupply. Once in orbit, several squadrons of [[Stormbird]]s and [[Storm Eagle]]s headed for the surface brink of Rangdadestruction. In fact, the former homeworld of conflicts were so terrible that much information about them was suppressed or destroyed after the XenosImperials finally claimed victory. Queries from the Dark Angels regarding their destination were ignored and when [[Praetor (Rank)|Knight-Praetor]] [[Kordray Mordred]] demanded to speak with the Sons The nature of Horus commanderthis victory itself was highly disputed, he was met with a sudden and indiscriminate barrage. The barrage left little of many conflicting accounts existed about the Dark Angels fortifications intact yet inflicted only light damage on the chantry house of the [[Order of Broken Claws]]final Rangdan Xenocide.{{Fn|11b}}

The outermost defenses crippled, the Sons of Horus gunships set down and disgorged a full Chapter including a company of [[JustaerinDark Angels]] created the [[TerminatorOrder of Broken Claws]]s. The Sons during the Xenocides; this cadre of warriors had the specific task of Horus advanced upon their shattered foe, committing only a token force to seize fighting the [[AstropathRangdan]]ic nexus. The Justaerin [[ConsulXenos]] himself tore . Even though the Chapter House gate from its hinges and dared Order faded in importance after the defenders within Imperium claimed to come out against him. When none dared to come forthhave destroyed the entire species, the Justaerin marshalled their strength it was not disbanded and entered the antechamber. At that moment, instead continued to guard a great detonated spread across the entrance, causing great damage to the Sons of Horus and trapping them inside. It was then that the 12 surviving Dark Angels of the station on [[Order of the Broken ClawAdvex-Mors]] attacked the nearly 50 Justaerin. Within the pitch-black labyrinthine corridors of where the Chapter House Rangda had first been encountered by the Broken Claw broke the pride of the [[Warmaster]] and when Sons of Horus reinforcements managed to breach the rubble and arrive inside they found a mountain of their comrades corpsesImperium. The three surviving Dark Angels withdrew to {{Fn|1b}} Some accounts would later misidentify this world as the lower vaults where the relics of Rangdan homeworld, allegedly purged during the Third Rangdan were held in stasisXenocide.{{Fn|11a}}

The station at Advex-Mors harbored the secret knowledge and waeponry associated with the Rangda and the Xenocides.{{Fn|1b}} The 51st Dark Angels Chapter, known as the Sable Griffons, was tasked to guard and protect the Order of Broken Claws in turn. The Advex-Mors garrison was eternally vigilant for the possible return of the Rangda.{{Fn|1a}} ==Battle==In 006.[[M31]], the Dark Angels at Advex-Mors were hailed by the [[Sons of Horus]] [[Heavy Cruiser]] ''[[Conqueror's Pride]]'' which signaled it needed to resupply. Once in orbit, several squadrons of [[Stormbird]]s and [[Storm Eagle]]s headed for the surface of Advex-Mors. 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 fortifications intact yet inflicted only light damage on the chantry house of the Order of Broken Claws.{{Fn|1a}} The outermost defenses crippled, the Sons of Horus gunships set down and disgorged a full Chapter including a company of [[Justaerin]] [[Terminator]]s. The Sons of Horus advanced upon their shattered foe, committing only a token force to seize the [[Astropath]]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 detonation spread across the entrance, causing great damage to the Sons of Horus and trapping them inside. It was then that the 12 surviving Dark Angels of the Order of Broken Claws attacked the nearly 50 Justaerin. Within the pitch-black labyrinthine corridors of the Chapter House, the Broken Claws broke the pride of the [[Warmaster]] 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|1a}} Their honour besmirched, the Sons of Horus refused to resort to simple solutions such as [[Promethium]] or [[Phosphex]] and 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 single Dark Angel defender. Three further bands of Sons of Horus descended and stilla single Dark Angel stood guard over the guard. Word then reached the rearguard that the Dark Angels 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 vault for valuable pieces of Rangdan technology, which had been their objective all along. The ''Conqueror's 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 Praetor Mordred and his [[Deathwing]] lifeguard, while another was shot down and destroyed by [[Ravenwing]] warriors piloting [[Xiphon Interceptors]], though the survivors of the Sable Griffons could not halt theexodus of the Sons of Horus.{{Fn|11a}}

could spare no time to exact any revenge, for the [[Promethean Class Cruiser]] ''[[Invidious]]'' had returned, called back from patrol by Knight-Praetor Mordred, and the ''Conqueror's Pride'' was no match for the ancient Terran warship in open battle. Bloodied in body and pride, the Sons of Horus fled the Rangda Advex-Mors system. They had come seeking both weapons for Horus' desperate rebellion and to break the will of one of the unquestionably loyal Legions but could claim little more than a pyrrhic victory.{{Fn|11a}} However, the potency of the captured waepons could turn the Horus Heresy in the Traitors' favor.{{Fn|2}}

*{{Endn|1}}: [[The Horus Heresy Book Nine - Crusade]], pgs**{{Endn|1a}}: pg. 125-126**{{Endn|1b}}: pg. 90-91**{{Endn|1c}}: pg. 107*{{Endn|2}}: [[White Dwarf 470]], pg. 101 - ''Chronicles of the Horus Heresy''