Drawn from the same world as the Legio Fureans, House Mordred was founded during the Age of Strife. Loyal to the Forge World's rulers, the house found itself embroiled in the near-constant cycle of battle that wracked Incaladion until it was liberated by the Great Crusade.
This millennia of warfare saw the two entities forge an eternal bond of brotherhood that called both into service at the forefront of the Great Crusade. This brotherhood was reaffirmed each time House Mordred and the Tiger Eyes shared the field of battle through ceremonies often deemed crude and primitive to outside observers.
In exceptional cases a princeps would accept a banner of Knights as sworn vassals, the Knights swearing oaths in ritualistic trials of blood that superseded any oath they had previously spoken. This seemingly unshakable bond ensured that when the Tiger Eyes declared for the Warmaster, House Mordred followed in their wake.
The uncompromising reputation House Mordred held proved indispensable in the opening years of the Horus Heresy, for their Nobles showed no hesitation in turning upon those they once fought alongside.
Much of House Mordred's strength remained at the side of the Legio Fureans, their numbers making notable contributions to both the invasion of Paramar V and the subsequent conflict in the Beta-Garmon Cluster.
The remaining strength was pledged to the Warmaster as tribute, serving under his will above all others and bringing wanton slaughter to dozens of worlds in his name.
- Battle of Beta-Garmon, "The Titandeath" (006-013.M31) - House Mordred took part in the long and savage Beta-Garmon campaign, which included hundreds of war zones across dozens of worlds. During this conflict, House Mordred provided Knight support to the Legio Suturvora. Even before the greater armies of the Warmaster Horus reached the star cluster, the battle lines had long since been drawn, and fighting had been going on for many Terran years. It was a cauldron of battle that would consume millions of lives before its end and see the demise of entire Titan Legions, earning this campaign the dire moniker of the "Titandeath." The Beta-Garmon Cluster, also known as the gateway to the throneworld of Terra, was the last hurdle that the Warmaster Horus' forces had to overcome before they reached the Imperium's capital world. Heavily fortified by the Loyalists, Beta-Garmon would become one of the greatest and bloodiest battles of the Horus Heresy, as well as one of the longest-lasting.
- Ambush at Espandor (ca. 009.M31) - In the wake of the conflict on Ulixis, the Loyalists sought to press the advantage, working to divide the Traitors in order to more efficiently dismantle their strength. When word reached the Legio Praesagius of a gathering invasion intended to seize the Agri-world of Espandor, the Loyalists laid plans to intercept the Traitor efforts, focusing their forces on the Boreaus Agri-sprawl, a heavily developed area containing a maze of feed-towers and macro-granaries that would serve to negate the numerical advantage of the Traitors. Though only a handful of Titans from Legio Praesagius could be mustered, they were supported by several maniples from the Legio Oberon, alongside dedicated companies of both Titan Killer infantry and super-heavy tanks. Amongst their number stood the Psi-Titan Occedentalis-Damysus, the Warlord-Sinister lending its support to Princeps Ultima Dae Vergos' forces for reasons known only to its preceptor-intendant. Having marshalled their forces, the Loyalists hoped to spring a devastating ambush on the approaching Traitor force, consisting of Titans drawn from both the Legio Audax and the Legio Suturvora, with supporting banners from House Mordred. Though Vergos had constructed her plan with meticulous detail, she could not account for the actions of the dark powers to which the Traitors now bowed. The Occedentalis-Damysus, tasked with striking the opening blow against the Traitors, found its talents stifled by the forces the Traitors employed. With the Psi-Titan brought low by packs of Audax Warhounds hiding amongst the very buildings Vergos sought to use against the Traitors, the Loyalists were forced onto the back foot. In an effort to secure victory, Vergos ordered her forces into the city in order to limit the numerical advantage of the Traitors, drawing them into a bitter, close-quarters fight.
- Second Battle of Paramar V (011.M31) - Paramar V having fallen to the Warmaster Horus' hosts in the opening moves of the Horus Heresy, a mixed force of Loyalists launched an assault against the strategically vital supply nexus with the intent of denying it to the Traitors' war efforts. The Traitors numbered a substantial combined force of House Mordred banners, Legio Fureans and Legio Mortis god-engines that were in the system re-arming and re-supplying after several years of intensive campaigning, and a large presence of Sons of Horus and Word Bearers Astartes. The Loyalists committed a large Titan force drawn from the Legio Atarus, Legio Ignatum and Legio Solaria, with ground assault units of the Blood Angels and White Scars Legions. The Loyalists conducted a series of diversionary attacks across the Paramar System in order to draw forces away from their true target, before conducting a full-scale planetary assault against Paramar V's primary spaceport, capturing it intact and then pressing outwards to begin the destruction of the mass-provender silos sprawling across the plateau beyond. It was soon revealed that the Traitors had seen through the ploy and prepared a large counterattack. Though they inflicted heavy damage on the provender silos before the counterattack hit home, the vast majority of the Loyalist invasion force was surrounded and destroyed without mercy.
Legion Combat Doctrine
The warfare practiced by House Mordred was methodical and brutal, for they marched in the shadow of Titans to eradicate anything that dared survive the power of the god-engines.
For House Mordred, mercy was an unfathomable concept and none was offered to those within conquered cities, for they cared little for the distinction between the innocent and the guilty.
When the house was engaged in theatres of war separate from the Legio Fureans, such behaviour often placed them at odds with commanders more appreciative towards the value of life and many were the requests that House Mordred's savage excesses be reined in.
Many within House Mordred were ardent believers in the rituals of their homeworld and would often refuse to send their banners into battle without observing the lengthy rites of devotion to House Mordred's feral representation of the Omnissiah.
These beliefs could not be called into question and none, friend or foe, were spared these Knights' wrath should they show disrespect to the practices of the Household.
- Glatisant (Knight Warden) - This notable Knight Warden was piloted by Seneschal Agvain.
- Seneschal Agvain - This Scion piloted the notable Knight Warden Glatisant, and willingly followed his household into damnation when they sided with the Warmaster during the Horus Heresy. Agvain was a seasoned veteran by this time, of three solar decades of war, and Glatisant participated in numerous battles across Ultramar. An ardent believer in barbaric rites of his home world, Agavain often refused to send his Banner into battle without first performing their lengthy rites of devotion to the Machine God. His extreme devotion saw Agvain rise quickly within the ranks and he was granted the rank of Seneschal when House Mordred descended upon Espandor. His ultimate fate is unknown.
The colours of House Mordred are black and red with gold trim.
The arms of House Mordred is a stylised white serpent wrapped around a great sword pointing downwards.
- Adeptus Titanicus - The Horus Heresy: Titandeath (Specialty Game), pg. 95
- Adeptus Titanicus - The Horus Heresy: Shadow and Iron (Specialty Game), pp. 9, 56-57
- White Dwarf (August 2018), "Parade Ground - The God-Machines March", pg. 106
- Warhammer Community - Adeptus Titanicus Part 5: Miniatures Showcase