Legio Mortis - Notable Titans: Aquila Ignis (Imperator-class Titan) - The Aquila Ignis was an Imperator-class Emperor Titan constructed in the Daedalia Forge Yards far to the south of Tharsis on Mars. The Aquila Ignis fought during the Schism of Mars against Loyalist elements from the Legio Tempestus in the battle for Magma City, where it was destroyed in the heavy combat.Dies Irae (Imperator-class Titan) - The Dies Irae was an Imperator-class Titan which was attached to the 63rd Expeditionary Fleet under the command of the Warmaster Horus. This infamous Titan was present during the opening days of the Horus Heresy at Istvaan III, when it followed Horus' orders and helped exterminate the remaining Loyalist Astartes of the Traitor Legions present on that cursed world after they were virus-bombed by their comrades from orbit. The Dies Irae was also present during all of the major ground assaults towards the end the rebellion. The Dies Irae finally met its fate ten millennia later during the siege of Hydra Cordatus in 999.M41 during the 13th Black Crusade when it served as part of an Iron Warriors attack force. When it was confronted by Imperial Titans from the Collegia Titanica, the Dies Irae was critically damaged when a Loyalist Warlord-class Titan detonated its plasma reactor when it was in close proximity to the Traitor Titan, which damaged the ancient Imperator-class Titan's armour. Another Warlord Titan then penetrated the Dies Irae's Void Shields and compromised external carapace with its Battle-Claw and crushed the Chaos-tainted Titan's plasma reactor. The resulting explosion wiped the Dies Irae's ancient taint from the face of the galaxy forever.Excoriator Vita (Warmaster Iconoclast-class Titan) - After its founding, the Legio Mortis was often used as the instrument of the fabricator-general's will. Thus, it is unsurprising that the Titan Legion, long-favoured by the ruling hierarchy of Mars, seemingly possessed the largest stock of Warmaster and Warmaster Iconclast pattern Titans within its vaults; collated estimates point to the Legio Mortis fielding between three and eight unique Warmaster and Warmaster Iconoclast Titans during the Horus Heresy. Of those, Excoriator Vita has the most surviving recorded data within numerous pict-captures recovered from the ruins of the Fortress World of Cerebiaus III. The partially corrupted footage recovered from the planet depicts the Iconoclast's efficient dismantling of the planetary capital's defensive lines, communication network and a maniple of Legio Ignatum Warhounds garrisoned within it. Cerebiaus III was not the only Loyalist stronghold to feel the wrath of Excoriator Vita, with the surrounding star systems bearing many scars marking the march of this god-engine.Breath of Thunder (Warlord-class Titan) - Fought with the Traitor Legions during the Horus Heresy at the Drop Site Massacre on Isstvan V; destroyed by the Legio Atarus Reaver-class Titan Red Naga.Cadavaris Perdita (Warlord-class Titan) - Command Titan of the Legio Mortis detachment sent by the Warmaster Horus alongside the Imperial Censure Host to Prospero and god-machine of Princeps Senioris Maldis Drane. The Warlord-class Titan Cadavaris Perdita was a storied veteran of the Great Crusade, having fought for many standard years alongside the Sons of Horus Legion and the 63rd Expeditionary Fleet. The attack on the Zhao-Arkhad sub-forge was to be Maldis Drane's last battle, however, as he was slain when his Titan was decapitated by the Legio Xestobiax Reaver-class Titan Sleepless Watcher. Yet the carcass of the venerable Warlord was recovered and re-commissioned by the Legio Mortis, but ever afterwards retained the shame of its defeat and was considered something of a pariah among the Death's Heads. Mentioned as Aeterna Virtus in the Prospero Censure Host list.Death's Head (Warlord-class Titan) - Participated in the assault on Davin's moon during the Great Crusade.Harbinger of Woes (Warlord-class Titan) - Legio Mortis Warlord Titans such as Harbinger of Woes were a common sight on the battlefields of the Beta-Garmon cluster during the Battle of Beta-Garmon. The close association the Legio Mortis had with Horus Lupercal during the Great Crusade continued during the Horus Heresy, with the Death's Heads participating in some of the most influential conflicts of the civil war. At Beta-Garmon, many Legio Mortis Titans added significant numbers of god-engine kills to their honour banners, with Harbinger of Woes claiming at least nine confirmed kills in the two standard years prior to Beta-Garmon's fall to the Traitors. Later images depict this Warlord Titan bearing numerous battle trophies from the conflict, including armour ripped from the wreckage of Legio Solaria and Legio Ignis Titans it had destroyed.Ire Incarnatus (Warlord-class Titan)- Fought with the Emperor's Children Traitor Legion during the Horus Heresy in the Tarren Suppression.Molossus (Warlord-class Titan)Penumbral Reaper (Warlord-class Titan) - Fought with the Sons of Horus Traitor Legion during the Horus Heresy during the Battle of Molech.Phantom Lord (Warlord-class Titan) - Fought with the Sons of Horus Traitor Legion during the Horus Heresy at the Battle of Molech.Manus Mortis (Warlord-class Titan) - A siege Warlord-class Titan that fought in the Great Crusade and the Battle of Terra. Present during the siege of the Imperial Palace.Tantus Abolitorus (Warlord-class Titan) - A Warlord of sinister reputation, Tantus Abolitorus was one of the eldest and most honoured Titans of the Legio Mortis, its battle-honours and kill-marks reputedly dating back to eternity. Located on Mars during the dire events of the Horus Heresy, Tantus Abolitorus fought in the early days of the Schism of Mars levelling the tower-perceptory of the Adeptus Astartes in the early hours of the civil war to ensure that no Space Marine would fight on the Loyalist side.Tellum Ire (Warlord-class Titan)Xestor's Sword (Warlord-class Titan) -Xestor's Sword fought with the Sons of Horus Traitor Legion during the Horus Heresy at the Battle of Molech.Black Consul (Reaver-class Titan)Dread Wake (Reaver-class Titan) - Fought with the Sons of Horus Traitor Legion during the Horus Heresy at the Battle of Molech. Participated in the Istvaan III Atrocity. It was part of War Maniple Ferrum Mori.Ferrum Mori (Reaver-class Titan) - Ferrum Mori participated in the Istvaan III Atrocity. It was Lead Battle-Titan of War Maniple Ferrum Mori.Hand of Ruin (Reaver-class Titan) - Hand of Ruin fought with the Sons of Horus Traitor Legion during the Horus Heresy at the the Battle of Molech. It also participated in the Istvaan III Atrocity. It was a member of War Maniple Ferrum Mori.Iron Baron (Reaver-class Titan) - Iron Baron  participated in the First Battle of Rhetori III during the Horus Heresy.Myrmidon Rex (Reaver-class Titan) - Myrmidon Rex participated in the Istvaan III Atrocity. It also fought with the Sons of Horus Traitor Legion during the Horus Heresy at the the Battle of Molech. It was part of War Maniple Ferrum Mori.Mortmain (Reaver-class Titan) - Mortmain participated in the Istvaan III Atrocity. It was part of War Maniple Ferrum Mori.Varcarnerix (Reaver-class Titan) - The Varcarnerix was a truly ancient war engine, whose armoured core, although rebuilt and repaired many times, dated back to the ancient wars of Mars during the Age of Strife. Taking part in the Razing of Prospero as a part of the Legio Mortis contingent assigned to the Imperial Censure Host, it was badly damaged and forced into retreat early in the battle against the unleashed Taghmata of the Arkhadine sub-forge, having borne the brunt of the enemy battle-automatas' and Krios tanks' barrage. It was this withdrawal that enabled its survival. As a result, it did not face the fury of the Legio Xestobiax, nor suffer from the arrogance of the Legio Mortis' attack pattern against them.Vulkus Tor (Reaver-class Titan) - Destroyed by Orks on Ullanor during the Great Crusade.Blood Wolf (Warhound-class Titan) - Blood Wolf participated in the Istvaan III Atrocity. It was a member of War Maniple Ferrum Mori.Carrion Crow (Warhound-class Titan) - Carrion Crow participated in the Istvaan III Atrocity. It was a member of War Maniple Ferrum Mori.Scar of Honour (Warhound-class Titan) - One of the few Scout Titans attached to the Legio Mortis detachment during the Fall of Prospero, the Scar of Honour was a relatively recent creation of the Martian forges, its livery as yet unadorned by heraldic victory markings. Rather than deploy his Warhounds as a skirmish line to probe the defences of his foe when approaching the surface ruins of the Zhao-Arkhad sub-fane, Princeps Senioris Drane, in command of the Legio Mortis during planetfall, instead deployed them as outriders out on the extreme flanks of their approach, expecting them to hunt down the fleeing remnants of a broken foe. As a result, the Warhounds were the last to engage the Xestobiax and the last to be destroyed.Sothis (Warhound-class Titan) - Sothis participated in the Istvaan III Atrocity. It was a member of War Maniple Ferrum Mori.Tenebris Fedelis (Warhound-class Titan) - Tenebris Fidelis fought with the Traitor Legions during the Horus Heresy at the Drop Site Massacre on Isstvan V.Tellum Ire (Warhound-class Titan) - Tellum Ire participated in the Battle of Beta-Garmon during the Horus Heresy.Venator (Warhound-class Titan) - The Venator was a member of the Death's Head Scouts, a Warhound Titan battlegroup that fought during the Horus Heresy. It was the excesses committed by Senior Princeps Esau Turnet's Death's Head Scouts during the course of the Horus Heresy which were directly responsible for the Imperium later terminating the practice of organising Scout Titans (such as the Warhound) into battlegroups. By the order of the High Lords of Terra they were limited to operating singly or in pairs, so that the horror of civilian massacres, perpetrated by packs of Warhound-class Titans during the Battle of Terra, might never again be visited upon Mankind.