Over a million soldiers the Imperial Army were mustered for the planned Ghaslaskh Crusade, including several established army groups such as the Calaq War Host, and nearly a dozen newly raised regiments from the various cities and agricultural provinces of Calth. Also added to the muster was a number of Solar Auxilia pattern regiments in anticipation of void actions against Ork asteroid-craft at Ghaslakh, including the much renowned 41 st Espandor High Guard. Other notable regiments include:

The following information is not to be regarded as officially sanctioned and/ or is not written from an in-universe point of view. A detailed explanation of the term "Trivia" as used in the Lexicanum can be found here.

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House Vornherr - One of the largest Knight Houses in the Segmentum, House Vornherr was oathed to fight alongside the Five Hundred Worlds unto death. Aside from a small honour guard of squires and barons left on their home world of Luhnborg-IX, the entire Household, consisting of around five hundred Knights, were mustered at the Platia island-city in Calth's southern oceans. During the Battle, the Word Bearers seized control of the orbital weapons platforms around Calth and turned their weapons onto the Veridian star, Calth's sun. [1f] They intended to induce a catastrophic supernova, but the Ultramarines prevented this. Instead, the star was poisoned and began to bombard Calth with lethal radiation. The survivors of the combat were forced to retreat into Calth's massive cave system, where the Battle continued as the Underworld War. [1g] Yet, despite the Loyalists' last-minute victory and the survival of the Ultramarines Legion and its Primarch, the forces of Chaos could consider their assault on Calth a success. The XIII th Legion had been badly crippled and no longer presented a viable threat to Horus' plan to drive on Terra. Seven years after the Battle of Calth, a war weary Vakrah Jal, Kaurtal, journeys to the surface and remembers his rebirth at the hands of Argel Tal. Or is this the past telling of the future to be?

From the bridge of the disabled flagship Macragge's Honour, Guilliman swiftly deduced that the Word Bearers were opening fire on them, but attributed it to mistake on Lorgar's part. He transmitted urgent pleas for cease-fire, but when Lorgar refused to stop after a direct lithocast communication, Guilliman reluctantly authorized his forces to defend themselves, officially commencing the Battle of Calth at Mark Zero. [2i] Prosecution You have no option! Come with Horus or all you have actually sought will definitely have actually stopped working. Ventanus was immortalised on the cover of Mark of Calth , the 25th book in The Horus Heresy series which chronicles the planet’s demise. There were many portents of the tragedy soon to unfold upon Calth. Given the extraordinary thoroughness with which the XIII th Legion maintained its readiness, it might have been considered tragic, or incompetent, that so few were heeded. The first signs of the Word Bearers betrayal was the minor interruption in Vox traffic around Calth that was attributed to solar distortion -- the void was known to forever creak and whisper around the audible and electromagnetic ranges. Soon there were various reports of a voice chanting over Calthian Vox-links in Calth space. This eerie chanting soon interfered with the main orbital data-feed between the orbital installations and the surface of Calth for several seconds. An hour later, there were two more bursts of such interference, the source of which remained undetermined. Calth Communications Control reported an hour later that there were "a series of malfunction events" and warned that further communication disruptions might be expected during the day until the problem was identified. An hour after that, on the night side of Calth, the first of the bad dreams began. This anthology contains the following stories: The Shards of Erebus by Guy Haley, Calth That Was by Graham McNeill, Dark Heart by Anthony Reynolds, The Traveller by David Annandale, A Deeper Darkness by Rob Sanders, The Underworld War by Aaron Dembski-Bowden and Unmarked by Dan Abnett.The Campanile continued to plow through the orbital installations surrounding Calth, shooting forward like a solid projectile, a gargantuan mass of streaking death. It annihilated a pair of slipways and the ships within them, ramming through the vital data-engine hub and destroying multiple data-engines as well. As the automatics failed and the noosphere experienced a critical and fatal interrupt, the orbital fleet yard’s power core was obliterated, killing over 35,000 men and women. The Campanile finally broke up, still travelling at immensely high realspace velocities, and a large chunk of the disintegrating vessel spun out of control and destroyed another Ultramarines Battleship. The remaining pieces of the Campanile cleared the far side of the Calth Veridian Anchor and rained down, burning like meteorites, upon the surface of the planet. Anthology of short stories revealing the untold tales of the Underworld War. The Heresy came to Calth without warning. In just a few hours of betrayal and bloodshed, the proud warriors of the XIIIth Legion – Guilliman’s own Ultramarines – were laid low by the treachery of their erstwhile brothers of the XVIIth. Now, as the planet is scoured by solar flares from the wounded Veridian star, the survivors must take the fight to the remaining Word Bearers and their foul allies, or face damnation in the gloomy arcology shelters beneath the planet’s surface. A collection of stories by authors including Dan Abnett, Aaron Demsbki-Bowden and Rob Sanders. The battle for Calth is far from over… Mark of Calth (The Horus Heresy #25) by Laurie Goulding – eBook Details At the breaking of the final seal, the hosts of hell were awakened and wroth poured forth upon the land." XIII th Legion records of the Calth muster remain highly accurate with regards to their own numbers, and place the total amount of combat-ready Legiones Astartes deployed by the Ultramarines at 185,923 Space Marines.