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Burning of Ohmn-Mat

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Burning of Ohmn-Mat
Conflict Horus Heresy
Date 010.M31
Location Ohmn-Mat
Outcome Mutual destruction
Traitors Loyalists
Captain Jharran Deygen(KIA)
Warleader Durante Osch(KIA)
Sons of Horus 84th Company
Word Bearers
Millions of Traitor Imperial Army
At least 1 Grand Cruiser
Auxilia Myrmidon
Legio Cybernetica
Iron Hands elements
All All

The Burning of Ohmn-Mat was a battle of the Horus Heresy.[1]


By the time Horus' Dark Empire encroached on the Forge World of Ohmn-Mat in 008.M31, it was already embroiled by war. News of the Betrayal on Isstvan brought great turmoil amongst its ruling synod, plunging the planet into civil war. After two years of war, its wealth and industrial capability had been reduced even further. However, Horus wished to conquer the world in order to secure the Warp Route between Cyclothrathe and Honorum. Sons of Horus Captain Jharran Deygen was charged with the conquest of Ohmn-Mat for the Warmaster. His forces included thousands of Sons of Horus and Word Bearers as well as millions of traitor Solar Auxilia and Imperial Army. Guided by his Esoterists and Word Bearers Diabolists, Deygen let Ohmn-Mat bleed for two years as his fleet orchestrated a campaign of precise ritual killings in the outlying System.[1]

In 010.M31, Ohmn-Mat was finally fully assaulted by Deygen's forces. After moving unopposed into orbit, Deygen launched a Drop Pod assault on the loyalist Forge-Fane of Thyaetira. However, its Defense Lasers proved too cumbersome to target the incoming Kharybdis Assault Claws and Dreadclaws. 9 in every 10 of the assault craft landed intact, unleashing hordes of traitor Legionaries which began their slaughter across Thyaetira and pushed back Scyllax Automata and Tech-Thralls. Deygen's own 84th Company, the "Strife Bringers", led the assault and used their sole Leviathan Dreadnought to smash its way into the Forge-Fane's inner domain. Soon enough the Traitors encountered Thyaetira's elite in the form of Vorax and Arlatax Robots. The 84th Company's course was driven by their own ritualistic schemes, and their rear began to suffer heavy casualties at the hand of heavier loyalist robots until 3 Contemptor Dreadnoughts were deployed.[1]

At length, the Sons of Horus resorted to collapsing tunnels and intersections with breaching charges to cut off routes of approach, abandoning entire squads in delaying actions against the relentless Cybernetica as they sought to avoid being drawn into a protracted battle that would delay their advance. Such efforts allowed Deygen to reach their target after 3 hours of heavy fighting and the death of at least 200 Space Marines. Here at Thyaetira's vast Servitor harvesting precincts was the disturbance the Legion Esoterists had first detected and sought. The traitors used the suffering of millions at this site to power their own ritual, but it was soon interrupted by the arrival of Iron Hands under Warleader Durante Osch, who was a former Thaumaturge Librarian. Even as the loyalist Astartes fell, the loyalist Mechanicum forces pushed into a fresh counterattack in the form of Myrmidon Destructors and Thanatar Robots. Pinned between two forces, the 84th Company was forced into a defensive posture. Thanks to the 84th's Reavers, the attack was blunted and dead or dying Iron Hands were dragged back to Traitor lines to power their ongoing ritual.[1]

After heavy fighting, all six of the remaining Sons of Horus Dreadnoughts were overwhelmed by the incoming hundred-strong cybernetica assault. However despite efforts to rescue their captured kin, the captured Iron Hands and Mechanicum Taghmata further powered the traitor ritual and allowed it to come to a head. Daemon Brutes that were bound to the Traitor Legion began to manifest into the captured victims and quickly charged into the loyalist lines and reaped destruction there. The now badly-wounded Osch unleashed his own psychic powers, engaging Deygen and his retinue in a duel before being struck down. However as Deygen turned to gloat of his triumph, Osch used one last gasp of strength to smash in the traitorous Captain's head with his own Thunderhammer. However, Deygen's body proved to be the vessel from which the Daemon Samus manifested.[1]

Madness erupted across Ohmn-Mat as soon as Samus first manifested. Warp-Born horrors of all the Chaos Gods erupted across the Forge World, who began attacking everyone on Ohmn-Mat. The remaining loyalist forces within the Forge-Fane Thyaetira conducted a desperate last stand, but it was futile before Samus and his Daemonic hordes. As the bound Daemons conducted their rampage, the Sons of Horus aided them in hunting down the last of the loyalist Magi and Iron Hands within the Forge-Fane. Not even three of the Legion's Dreadnoughts were enough to bring down Samus. As the world fell, the remaining Loyalist Tech-Priests and Iron Hands chose to deny the traitors their victory, by activating the Primarch Ferrus Manus' Ceaseless Pyre Mimetic Annihilator within Thyaetira's vaults deep below Ohmn-Mat. The weapon set the very atmosphere ablaze and all life on the Forge World was extinguished alongside the traitor forces and even their vessels in orbit. The only evidence of what occurred there, came from data gathered by a damaged Ohmn-Mat Kill-Sat and the account from a Loyalist Tech-Priest from Thyaetira, who managed to escape aboard a modified atomic missile before the doomed Forge World was set ablaze.[1]

See also


Battles of the Horus Heresy
005-006.M31 Battle of Isstvan IIIFirst Battle of ProsperoWar Within the WebwayBattle of the Somnus CitadelUnrest on CalibanSchism of MarsBattle of DiamatDrop Site MassacreBattle of the Rangda SystemFirst Battle of ParamarManachean WarSignus CampaignTreachery at Advex-MorsSiege of CthoniaBattle for Felweather Keep‎
007-008.M31 Battle of PhallBattle of RavendelveRuin of MaerdanBattle of the Alaxxes NebulaPale Stars CampaignBreaking of the Perfect FortressChondax CampaignSecond Battle of ProsperoFirst Siege of Hydra CordatusBattle of the Furious AbyssBattle of CalthBattle of ArmaturaBetrayal at IthracaDeath of CanopusShadow CrusadeCrusade of IronDoom of BorminaDefence of TyrosDefence of the Three PlanetsBattle of UlixisAmbush at EspandorBattle of Aquila AtollBattle of Drooth IIPercepton CampaignBattle of IydrisThramas CrusadeFall of Baztel IIIBattle of VannaheimSecond Battle of ParamarBattle of Constanix IIMezoan CampaignBattle of BodtBattle of DwellErellian SubjugationSiege of Baal
009-010.M31 Battle of MolechBreaking of AnvillusXana IncursionCarnage of MoroxSangraal CampaignBattle of ArissakBattle of PerditusBattle of SothaDrussen AtrocityScouring of Gilden's StarBattle of NyrconBattle of TallarnCataclysm of IronBattle of NocturneWar of DrakesBattle of PlutoSiege of InwitBurning of Ohmn-MatBitter War
011-014.M31 Reaving of the Xibana ReachesLorin Alpha CampaignSubjugation of TyrinthMalagant ConflictBattle of the Kalium GateBattle of CatallusAxandrian IncidentBattle of the Haddon SystemJarrazr IncursionBattle of TralsakTarren SuppressionBalthor Sigma InterventionBattle of AbsolomScouring of the Ollanz ClusterBattle of ZepathSecond Battle of ZaramundBattle of AnuariBattle of PyrrhanSecond Battle of DavinArgolian MassacresBattle of TrisolianBattle of YarantBattle of KradeBattle of DelugeBattle of Heta-GladiusBattle of the Aragna ChainBattle of KallethBattle of the Diavanos SystemBattle of DesperationBattle of Beta-GarmonWar for AgaropsDefence of RyzaBattle of ThagriaPassage of AngelsThassos IncidentBattle of Zhao-ArkhadSerpent's CoilSiege of BarbarusForicaan CampaignBattle of VezdellBurning of VrexorDawn of DesolationDeath of ChemosBattle of Luth TyreYdursk IncidentFall of TenzebarSolar WarRaid on LunaSiege of TerraGreat Scouring