The conflict started by a sudden [[Khornate]] [[Chaos Cultist]] uprising in the capital [[hive city]] Creontiades. The First discovered when the cultists attacked [[Titan LegionEcclesiarchy]] [[Legio Pallidus MorConfessor]] was deployed along with the [[Imperial HuntersLehrn Ornastas]] . While Confessor Ornastas managed to repel the ambush and reported it to provide defensehis superiors, due to reports of [[Traitor Titan Legions|Traitor Titans]] being sent to his warnings were ignored. The cultists had been waiting for the planet. Remaining under 's Imperial Guard Regiment/PDF, the command of [[Marshal]] [[Adrel Syagrius]]Kataran 66th "Kataran Spears", to be deployed elsewhere. When the Pallidus Mor 66th was deployed to the Hive City of Deicoon, the city nearest Creontiades. Their mission was to defend the bridge over the Kazani Strait that connected Creontiades to the mainland. With fire support of the repel a [[Katara 66thtyranid]], the Pallidus Mor engaged the traitor Titans, which they identified as invasion of the planet [[Iron SkullsKania]]. The Iron Skulls outnumbers and outgunned the Pallidus Mor, forcing them to retreat back across the bridge. As a last resort, the Pallidus Mor opened fire on the bridge's support, destroyed the bridge and plunging it (and several traitor Titans) into the sea below. The Legio then returned to Deicoon for rearmament and repairsthey launched their uprising.{{Fn|1}}

Unfortunately, this was not the end The sudden attack of the conflict. Another group of cultists had lied in wait in the underhive of Deicoon. When the princeps of the Pallidus Mor were away from within the Titan's repair yards (visiting with hive city caught the city's governor), defenders unprepared and the cultists ambushed quickly took control of the cityhive. The PrincepsKataran Spears, Moderati, and Secutarii of along with the [[Titan Legion]]s [[Legio Pallidus Mor ]] and [[Imperial Hunters]], were overpowered sent to provide defense of the rest of the planet and capturedretake the city. The cultists took them Titan legions were assigned due to reports of [[Traitor Titan Legions|Traitor Titans]] being sent to a defiled chapel on the city, with the intent to corrupt them and their Titansplanet. Soon afterwards, a civilian militia called Under the "[[Company command of the Bridge]]" lead by [[EcclesiarchyImperial Hunters]] 's [[ConfessorMarshal]] [[Lehrn OrnastasAdrel Syagrius]], assaulted the chapel and freed Pallidus Mor was deployed to the members Hive City of Deicoon, the city nearest Creontiades, while the Imperial Hunters were deployed to [[Therimachus]]. The Pallidus Mor's mission was to defend the bridge over the Kazani Strait that connected Creontiades to the mainland. Upon being freedWith fire support from the Kataran Spears, the Pallidus Mor armed themselves and fought their way back to their engaged the traitor Titans, which they identified as the [[Iron Skulls]]. The Chaos Forces, expecting to have corrupted Iron Skulls outnumbered and outgunned the Pallidus Mor, were caught off-guard by forcing the LegioImperium's counterattackdefenders to retreat back across the bridge. The majority of As a last resort, the Pallidus Mor opened fire on the Iron Skullbridge's support, destroyed the bridge and plunging it (and several traitor Titans had moved onto Therimachus ) into the sea below. The defenders then returned to attack the Imperial HuntersDeicoon for rearmament and repairs.{{Fn|1}}

After defeating Unfortunately, this was not the traitor Titans at end of the conflict. Another group of cultists had lied in wait in the underhive of Deicoon, . When the princeps of the Pallidus Mor received requests for assistance by were away from the Titan repair-yards (visiting with the city's governor), the Imperial Hunters. Their brother legio was being overwhelmed by cultists ambushed the Chaos forcescity. Deciding to take the fastest routeThe Princeps, Moderati, and Secutarii of the legio moved through the Klivanos PlainPallidus Mor were overpowered and captured. The Plain was cultists took them to a volatile regiondefiled chapel in the city, with large the intent to corrupt them and unstable Promethium reserved beneath its surfacetheir Titans. Despite losing Soon afterwards, a Warhoundcivilian militia called the "[[Company of the Bridge]]" lead by Confessor Ornastas, assaulted the Legio successfully traversed chapel and freed the region. They were too late to rescue the surviving members of the Imperial HuntersPallidus Mor. The Upon being freed, the Pallidus Mor readied armed themselves and fought their way back to engage the enemy forcestheir Titans. The Chaos Forces, noticing that they were forming a defensive line expecting to stall for time as another Chaotic ritual was being prepared. Realizing they could not retake the city before the completion of the ritual, have corrupted the Pallidus Mor instead fired into the city. Firing salvo after salvo, were caught off-guard by the Legio leveled 's counterattack. The majority of the Hive, turning Iron Skull's Titans had moved onto Therimachus to attack the very ground below it into a sea of magma and rubbleImperial Hunters.{{Fn|31}}

Knowing that they may need more firepower, [[Princeps]] Captain [[Krezoc]] ordered After defeating the redeployment of ''Ferrum Salvator''traitor Titans at Deicoon, despite its repairs being incomplete. She then ordered the Kataran Spears and Pallidus Mor received requests for assistance by the Imperial Hunters. The Imperial Hunters were being overwhelmed by the Chaos forces. Deciding to retreat from take the sea of magma that once was Therimachus. During fastest route, the retreat legio moved through the Pallidus Mor suffered more losses as ''Crudelis Mortem'' Klivanos Plain. The Plain was destroyeda volatile region, causing a with large wave of magma which in return destroyed an enemy [[Banelord]]and unstable Promethium reserved beneath its surface. In its death throesDespite losing a Warhound, the corrupted Titan fired at ''Glorias Vastator'', critically damaging its reactorLegio successfully traversed the region. Most of They were too late to rescue the Titan's primary crew surviving members assembled in the command chambers and launched to escape the blast of the war machine's reactorImperial Hunters. The crew managed to reach and activate ''Ferrum Salvator'' just in time Pallidus Mor readied to engage and destroy the final enemy Titan at point-blank rangeforces, noticing that they were forming a defensive line to stall for time as another Chaotic ritual was being prepared. Realizing they could not retake the city before the completion of the ritual, the Pallidus Mor instead fired into the city. Firing salvo after salvo, the Legio leveled the Hive, turning the very ground below it into a sea of magma and rubble.{{Fn|13}}

Knowing that they may need more firepower, [[Princeps]] Captain [[Krezoc]] ordered the redeployment of ''Ferrum Salvator'', despite its repairs being incomplete. She then ordered the Pallidus Mor to retreat from the sea of magma that once was Therimachus. During the retreat the Pallidus Mor suffered more losses as ''Crudelis Mortem'' was destroyed, causing a large wave of magma which in return destroyed an enemy [[Banelord]]. In its death throes, the corrupted Titan fired at ''Glorias Vastator'', critically damaging its reactor. Most of the Titan's primary crew members assembled in the command chambers and launched to escape the blast of the war machine's reactor. The crew managed to reach and activate ''Ferrum Salvator'' just in time to engage and destroy the final enemy Titan at point-blank range.{{Fn|1}}  Meanwhile, back in Deicoon, the Company of the Bridge reentered the hive city, intent on killing as many cultists and saving as many loyalists as they could. Marching straight through flaming debris from the earlier battle between the Titan legios, they reengaged the cultists. Confessor Ornastus eventually located the leader of the cultists, a former colonial of the Kataran Spears. The confessor and the cultist engaged in a duel. While the cult's leader nearly killed the confessor, but the cult's defeat at Therimachus caused all of its members to turn and scream in agony, with the cultist leader flinging himself off the roof he and Ornastus were dueling on. The loyalists then began rounding up surviving cultists and publicly executing them.{{Fn|1}} The victory was a pyrrhic one. The vast majority of the Titans sent to the system by the Pallidus Mor (as well as the and Imperial Hunters) were destroyed, two of the planets three Hive cities were destroyed (Creontiades was leveled to the ground upon the arrival of Imperial Guard reinforcements), the forgeworld was reclassified as a [[Penal World]] (on the verge of being chosen for [[Exterminatus]]), and the planet's surviving loyalist population was interred and formed into a Penal Legion. The surviving members of the Pallidus Mor Titan legions, and the Titans they could salvage , prepared to return to thier ships to leave the ''Nuntius Mortis'', formally ending the combined battlegroup with the Imperial Huntersplanet.{{Fn|1}}