Blade of the Laer

The Chaos Champion of Slaanesh, Lucius the Eternal of the Emperor's Children Traitor Legion, wields a relic Power Sword from the Great Crusade. Millennia ago, following the Drop Site Massacre on Istvaan V, the Greater Daemon of Slaanesh who possessed the body of the Primarch Fulgrim, presented the Daemonsword Fulgrim had recovered from the homeworld of the xenos known as the Laer, to Lucius as a sign of Slaanesh's favour. This alien, single-edged blade once contained the captured essence of the daemon that possessed Fulgrim, but lost much of its power once the daemon was freed from imprisonment within the sword to inhabit the unfortunate Primarch's body for a time. Now the blade is an ordinary Power Sword of an exquisitely curved, single-edged design, but in Lucius' hands it remains as lethal as any blade that has ever been forged.

Fulgrim's Fall
Fulgrim, Primarch of the Emperor's Children Space Marine Legion, was one of the first of his kind to fall from the Emperor's grace on the xenos planet called Laeran, officially designated as Twenty-Eight-Three, being the third world the 28th Expedition had brought to Imperial Compliance. Unbeknownst to the III Legion, the serpentine Laer species were corrupted xenos worshippers of the Chaos God of Pleasure, Slaanesh. Though the resource-rich Ocean World of Laeran would be of immeasurable value to the Crusade of the Emperor, its alien inhabitants did not wish to share what blind fortune had blessed them with. They had refused to see the manifest destiny that guided Mankind through the stars and had made it abundantly clear that they held the Imperium in nothing but contempt. The III Legion's advance had been rebuffed with violence, and honour demanded that they answer in kind.

Fulgrim's 28th Expeditionary Fleet of the Great Crusade conquered Laeran for the Imperium, exterminating its hostile native reptilian species, the Laer. Laeran was a water world, its continents having sunk beneath its oceans' waves centuries before when all of its ice caps and glaciers melted. The oceanic world was home to a native sentient species known as the Laer who were reptilian and serpentine in form but also engaged in extensive genetic engineering to perfect their species, creating a multitude of different castes who were genetically designed to best serve their intended function in Laer society. Having no land area, the Laer, whose technology equalled or even exceeded that of the Imperium in certain areas, had moved their entire society onto hundreds of floating coral islands that circled a central nexus in the planet's atmosphere. Each coral island was held aloft by an anti-gravity generator.

What Fulgrim and his Emperor's Children Legion did not know was that the Laer were also an entire civilisation that had been corrupted by Slaanesh, the Chaos God of Pleasure and Pain. The central nexus point that all of their coral islands orbited was actually a massive temple dedicated to the Prince of Pleasure at the heart of which lay a potent Chaos Artefact, a beautifully crafted, single-edged Daemonblade, that served as the physical vessel for a Greater Daemon of the Prince of Chaos. The Laer evinced all the signs of what later generations of the Imperium would recognise as Slaaneshi corruption, including a need for constant extreme sensory inputs, such as riotous colours and constant sound, and the deriving of pleasure from only the most extreme of sensations, including their own deaths. Completely unaware of the real dangers he and his Astartes Legion faced on the Chaos-corrupted world, Fulgrim ordered the Emperor's Children and the other forces of the 28th Expeditionary Fleet to assault the planet and conquer it for the Imperium within a single Terran month, completely eradicating the Laer species in the process. The Council of Terra had decided that the subjugation of the Laer would cost too many Imperial lives and would take too long. Some estimates indicated that an attempted Imperial Compliance would take as long as ten standard years. There had even been talk of making Laeran a protectorate of the Imperium. Primarch Fulgrim would not countenance such talk, for by refusing the Emperor's beneficence, the Laer had effectively sealed their doom.

During the final slaughter of that serpentine xenos race, Fulgrim and his Astartes discovered the great temple dedicated to Slaanesh that lay on the central floating coral island of Laeran. The Imperium, ignorant of the existence of the Chaos Powers at this time and holding to the extreme rationalism and atheism of the Imperial Truth, did not realise the significance of such a find or what they had really discovered. The expedition led by Fulgrim began to be unwittingly corrupted by the temple's potent and malign influence. After defeating the temple's fanatical Laer defenders, Fulgrim discovered what the Laer were so fiercely protecting -- at the centre of the chamber of the unholy temple was a circular block of veined black stone, and embedded within was a tall silver sword with a gently-curved blade and a crude amethyst gem set in the pommel. This sword was not only a potent Slaaneshi artefact but also the physical vessel of a Greater Daemon of Slaanesh.

Once Fulgrim had claimed the blade as his own, the daemon within it began whispering in his mind and corrupting his soul towards the service of Slaanesh. He began to wield the daemonblade more often than his prior weapon, the great sword Fireblade that had been forged for him on Terra by his fellow Primarch and most favoured brother, Ferrus Manus. Thinking the whispers in his mind was only his own subconscious speaking to him, Fulgrim began listening to what it offered. Eventually, he discovered these were actually the whispers of the daemon that existed within the blade. After a lot of persuasion from his brother Horus, himself already corrupted by the Ruinous Powers after his injury on the moon of Davin, Fulgrim gave himself over to Chaos, and found his particular patron in the Prince of Pleasure, who offered the Primarch a route to the ultimate perfection he so craved for himself and his Astartes, free of all morality and dependent upon the pursuit of ultimate self-obsession.

The Horus Heresy
The great dream and ideals of the Great Crusade died when Warmaster Horus, Primarch of the Sons of Horus and most favoured son of the Emperor, was corrupted by the corrupting influence of the Ruinous Powers. He revealed his perfidy during the treacherous military campaign on the world of Istvaan III, that served both to amass those forces loyal to him without suspicion, and also cull those elements within the ranks of the Traitor Legions whose loyalties he suspected as remaining true to the Emperor of Mankind. After the news of the Istvaan III Atrocity was brought to the Emperor of Mankind by the Loyalists aboard the Death Guard Frigate Eisenstein, He ordered the combined forces of seven Space Marine Legions to assault the positions of Horus and his Traitor Legions in the Istvaan System. During that assault on the world of Istvaan V, three Loyalist Astartes Legions -- the Iron Hands, the Salamanders and the Raven Guard -- were betrayed by the 4 other Legions of the Loyalist second wave -- the Alpha Legion, Night Lords, Iron Warriors, and a large contingent of Word Bearers -- who they had believed were loyal to the Emperor of Mankind, but in fact had already betrayed the Imperium and secretly turned to the service of the rebellious Warmaster Horus and Chaos. As the Loyalists retreated back towards what they believed were friendly lines, the hidden Traitors revealed their allegiance by opening fire upon the Loyalists, catching them between a Traitor hammer and anvil and nearly destroying all three Loyalist Legions.

During the height of this conflict, the Daemon-possessed Fulgrim was confronted by the enraged Iron Hands' Primarch Ferrus Manus. Ferrus Manus turned to face Fulgrim, his teeth bared with the volcanic fury of his homeworld. The two Primarchs leapt at one anther, Ferrus wielding Fireblade and Fulgrim holding Forgebreaker. Their weapons had been forged in brotherhood, but were now wielded in vengeance, meeting in a blazing plume of energy. The two Primarchs traded blows with their monstrously powerful weapons, Ferrus Manus wielded his flaming blade in fiery slashes, his every blow defeated by the ebony hafted hammer he had borne in countless campaigns. Both warriors fought with the hatred only brothers divided could muster, their armour dented, torn and blackened by their fury.

The two Primarchs traded terrible blows, wounding one another deeply during their fierce struggle. As Ferrus pushed himself to his feet and staggered towards the wounded Fulgrim, he cried out as he brought the flaming blade towards his brother's neck. But Fulgrim lashed out as he drew the single-edged, daemonically-possessed sword he had taken from the Laer temple and blocked the descending weapon. With the power of Chaos streaming from the blade, diabolical strength flooded Fulgrim's limbs as he pushed against the power of Ferrus Manus, feeling his brother's surprise at his resistance. Fulgrim managed to surge to his feet and lashed out, his silver blade biting deep into the breastplate of Ferrus' armour, and the Primarch of the Iron Hands cried out, falling to his knees once again. Fireblade slid from his grasp as he gasped in fierce agony. As Fulgrim raised the silver sword in preparation of delivering the deathblow to Ferrus Manus, he found that he did not possess the fortitude to deliver the killing blow. In an instant he saw what he had become and what monstrous betrayal he had allowed himself to be party to. He knew in that eternal moment that he had made a terrible mistake in drawing the sword from the Temple of the Laer, and he fought to release the damnable blade that had brought him so low.

His grip was locked onto the weapon and even as he recognised how far he had fallen, he knew that he had come too far to stop, the realisation coupled with the knowledge that everything he had striven for had been a lie. As though moving in slow motion, Fulgrim saw Ferrus Manus reaching for his fallen sword, his fingers closing around the wire-wound grip, the flames leaping once more to the blade at its creator's touch. Fulgrim's blade seemed to move with a life of its own as he swung the blade of his own volition. Fulgrim tried desperately to pull the blow, but his muscles were no longer his own to control. The daemonic blade sliced through the genetically-enhanced flesh and bone of one of the Emperor's sons. The Iron Hands' Primarch fell to the ground, his head decapitated. Ferrus Manus was dead by his brother's own hand.

After the events of Istvaan V played out to their bloody, inevitable conclusion, the Astartes of the III Legion had no idea that their beloved leader was clawing ineffectually at the bondage of his own mind in which he was held. Only Lucius, Captain of the 13th Company, had appeared to realise that something was amiss with Fulgrim, but even he had said nothing. The Daemon-Fulgrim had sensed the burgeoning Warp touch upon the swordsman and had presented him with the silver daemonblade within which the Laer had originally bound a fragment of the daemon's essence, as he now wielded the far more potent Kinebrach Anathame, a gift from Horus. Though the Blade of the Laer was now bereft of its daemonic spirit, there was still power within the blade, power that would empower Lucius in the years of death to come.