Honsou - Invasion of Ultramar: With his army assembled, Honsou was finally ready to unleash his audacious plan for revenge against Uriel Ventris by completely destroying the Realm of Ultramar. He would enact his plan with the help of the Daemon Prince M'kar the Reborn, who had once been Maloq Kartho, a Dark Apostle of the Word Bearers Traitor Legion during the Horus Heresy.Learning of the vile daemon's long-standing hatred for the Ultramarines, Honsou was able to enlist the aid of Abaddon the Despoiler's damned seer Moriana to help free the daemon's spirit from its prison, which had been trapped within the Warp core of the Star Fort Indomitable by the Ultramarines' Chapter Master Marneus Calgar decades earlier, in 935.M41.With his formidable army of Chaos Renegades, Honsou easily captured the star fort and was able to free M'kar from his prison. The Daemon Prince then possessed the armoured Dreadnought chassis of Brother Altarion, an Ultramarines Astartes assigned to guard the fort. M'kar used Altarion's once-sacred shell as his host-body in order to remain in the material universe.With his army ready, Honsou's forces first struck within the Realm of Ultramar on the arid Imperial Agri-World of Tarentus. The newly freed M'kar bound the Indomitable to a Warp Gate and called forth a huge army of daemons to attack the cities of the planet from within, slaughtering the entire world's population.When the Ultramarines Chapter responded to the dire threat that Honsou's forces presented, the Warsmith left a trap for them in the planet's capital city of Axum, which nearly annihilated Captain Uriel Ventris and the entirety of his 4th Company.After their success on Tarentus, Honsou's forces next assaulted the Imperial Ocean World of Talassar. After laying siege to the planet, M'kar quickly forced himself into a position of shared command of the Warsmith's Chaos army and divided its forces amongst the various Chaos Champions, a situation neither Chaos Lord could tolerate for any length of time.The Forces of Chaos gathered by Honsou were dubbed by the Daemon Prince as the "Bloodborn," much to the Warsmith's resentment. Each subordinate commander was then assigned a different strategic target.M'kar convinced Honsou to travel to Ventris' homeworld of Calth, with explicit instructions from M'kar to destroy the Tomb of Ventanus -- the famed Ultramarines Captain Remus Ventanus who slew the Daemon Prince when he was still a mortal and a former Dark Apostle of the Word Bearers during the Horus Heresy.M'kar could not himself go near the tomb, which radiated the power of Imperial faith in the Emperor and was thus anathema to a creature of the Warp. Armed with the knowledge of Ventris, the clone known as the Newborn were able to find the location of the subterranean tomb within the Cavernas Draconi on Calth.Honsou and his ally Grendel were led by the Newborn and eventually discovered the tomb's exact location. As they prepared to destroy it, the keen mind of Honsou perceived that there was more to M'kar's reluctance to come near the world of Calth than the foul creature had admitted.Therefore, the Warsmith decided to investigate further and soon discovered that there was an artefact, a Combat Knife, buried with the long-dead Ultramarine Captain that was known as the Shard of Erebus. Honsou realised that the simple blade was capable of badly harming the Daemon Prince because of the faith that had been invested within it after so many millennia of devotion.But before the Warsmith could capitalise on the newly acquired weapon, Captain Ventris and a Command Squad of Ultramarines arrived and began attacking Honsou's forces. Honsou tasked the Newborn to kill Ventris, but in the ensuing battle the Ultramarines captain was able to defeat his corrupted clone.At the height of the battle, the Iron Warriors were overwhelmed and defeated by what appeared to be the ghosts of Captain Ventanus and his fellow Ultramarines that were housed within the tomb. With his warriors dead and his quest for vengeance foiled, Honsou activated the trigger for explosives intended to destroy the tomb.The resulting explosion buried Captain Ventris and his Astartes, but he and the majority of his allies managed to survive the explosion and subsequent cave-in. Upon further investigation, the body of Honsou was never found.M'kar survived to eventually face Marneus Calgar once more on the planet Talassar, but his essence was completely annihilated after Calgar struck him with the Shard of Erebus -- the same blade that Captain Ventanus had used to slay M'kar's human form of Maloq Kartho on Calth during the Horus Heresy.Honsou, however, had planned for this eventuality and escaped the collapsing tomb on Calth. A drilling machine that had been used by the Iron Warriors to reach the tomb complex had served him well as an escape vehicle, and he hid away, patiently waiting for the Ultramarine presence on Calth to decrease, while he plotted an escape plan.Over the course of the next six solar months, Honsou prowled the remains of the Calth battlefields, scavenging multiple items. Any Imperial citizen that chanced upon him simply disappeared, leading to rumours about a "Beast of Calth" on the loose that was killing civilians.These rumours eventually attracted the attention of Namira Suzaku, one of the Inquisitors overseeing the post-battle purges of any Warp-tainted entities, and Honsou realised that his time in hiding had run out. He ambushed a Calthian Planetary Defence Force (PDF) patrol, killing all but one of the troopers. Honsou butchered and dismembered the dead troopers, simulating a ritual sacrifice to the Dark Gods;  while torturing his still-living victim, he boasted of how he was now ready to deliver a death blow to Calth in revenge.The disappearance of the patrol, and the eventual discovery of Honsou's butchery, quickly brought Suzaku, a squad of Ultramarines and a whole PDF platoon on-site, and the dying trooper dutifully repeated everything he could remember of Honsou's ramblings.Inquisitor Suzaku deduced that the only way a single Iron Warrior could possibly hope to deliver a death blow to Calth on his own was by sabotaging one of the geothermal power plants that kept the atmosphere sealed and warm enough to sustain life deep within the planet's subterranean hive cities.While heavily defended, should such a station overload, the massive tectonic shifts and power shortages resulting from its destruction would indeed devastate Calth's fragile underground ecosphere. Confirmation of Honsou's plan soon came in the form of a warning call from the nearby geothermal station, as the resident Tech-priest detected an Iron Warrior Seeker drone hovering above the station, and broadcast a warning of a possible attack.Suzaku and the Ultramarines immediately set out to confront the threat, and ordered the PDF troopers to gather up the remains of their fallen comrades and retreat to Highside City, Calth's main spaceport. This was exactly what Honsou expected, and he hid in one of the reserve fuel tanks for a PDF Chimera.The Ultramarines would only find booby traps and a decoy close to the geothermal station, and in that time, the PDF would have since long returned home at their base next to Calth's spaceport. Once there, the Iron Warrior easily slipped out of his concealment and boarded a departing voidship, already plotting the next steps in his eventual revenge on Uriel Ventris and the accursed Ultramarines.The voidship Honsou escaped on was a Corpse-Hauler, a vessel built to ferry dead Imperials to Cemetery Worlds for burial. The vessel Shendao was carrying fallen Ultramar Auxilia and Astra Militarum soldiers to the planet Nakilla for burial, and carried a detachment of three Ultramarines.Taking the Navigator hostage, Honsou ordered him to set a new course. In doing so, however, he alerted the Ultramarines to his presence. Attacked by the Ultramarines, Honsou managed to kill all three and rendezvoused with his Battle-Barge Warbreed.Prior to entering Calth's depths, Honsou had ordered his lieutenant Teth Dassadra to take the Warbreed to Ultramar's edge and await his signal. Taking the bound Navigator with him, Honsou took command of the Warbreed once more and declared that he was finished with vengeance against the Ultramarines, considering his attack on Ultramar and the destruction he had wrought to be enough.The Warsmith admitted that he did not truly expect to win when he had embarked upon the assault, but only aimed to cause as much devastation as possible. Setting a new course, Honsou declared his new intent -- to travel back to Medrengard and meet with the Lord of Iron himself, the Daemon Primarch Perturabo.