Legio Honorum - Horus Heresy: At odds with the cold, rational logic of the larger Cult Mechanicus, the Legio Honorum became known for its optimism and dedication to the Imperium above all else. This circumstance unnerved many on Mars, with the Titan Legion's more vocal critics claiming the Death Bolts had abandoned oaths to the Red Planet and the Omnissiah in favour of those they fought alongside.Such accusations were denied by the Legio Honorum, and great efforts were made to repair bonds with the Titan Legion's ancestral home. To this end, the opening years of the 31st Millennium saw a delegation of Legio Honorum commanders return to the Red Planet to reaffirm the vows they had once taken and show solidarity to the Fabricator-General Kelbor-Hal's cause.With the benefit of hindsight, it is clear that the invitation extended to the Legio Honorum to return to the surface of Mars was a calculated one, for it coincided with the outbreak of civil war on the Red Planet with the Schism of Mars.No records speak of the motivation behind the targeted attack upon the Legio Honorum, though it no doubt stems, at least in part, from the belief that the Titan Legion was tied too greatly to the Great Crusade and the Emperor.Regardless of the driving impetus behind the betrayal of the Legio Honorum by the Dark Mechanicum, it was one the Titan Legion felt keenly. The assembled might of the Death Bolts' god-engines were arrayed on the parade fields of Mars, under the pretence of an inspection by the fabricator-general himself, when the "Death of Innocence" began. Mere solar hours later, those fields had been transformed into a grand robotic graveyard filled with fallen god-engines bearing the livery of the Legio Honorum.The treachery on Mars dealt a grievous blow to the Legio Honorum, for it was its most honoured and ancient commanders that had travelled to swear allegiance to the fabricator-general, including the commanding grand master of the Death Bolts himself.Despite this, much of the Legio Honorum's strength lay elsewhere, embedded with various expeditionary fleets which, by serendipity, remained firmly loyal to the Emperor.Indeed, the true fate of its commanders was not revealed until after the Warmaster Horus' fall, for the Red Planet was blockaded by the Loyalists and all contact, at least through means available to the surviving Death Bolts, severed. Presuming the worst, the command structure of the Legio Honorum was reorganised and adapted to the new war engulfing the galaxy.As with the Great Crusade, much of the Death Bolts' war efforts were focused on maintaining constant movement, committing to war zone after war zone as they moved to liberate worlds from the Warmaster's yoke.As the conflict progressed, the continued success of the Legio Honorum saw its foes unleash their wrath upon the Death Bolts' holdings, levelling three forge-fortresses with orbital bombardments and denying the Titan Legion the means to replenish their number. In response, the Legio Honorum was to assemble in its entirety and lay siege to the Forge World of Stygies VIII, the founding world of the Legio Vulcanum I and Legio Vulcanum II. This was unusual, as even before the Horus Heresy it was very rare for a Forge World to be home to more than one Titan Legion.Though well-defended, much of the Legio Vulcanum's strength was scattered throughout the Warmaster's armies and the Forge World fell quickly to the overwhelming might of the Legio Honorum.Of all the victories achieved by the Death Bolts during the Horus Heresy, the conquest of Stygies VIII was perhaps their greatest, yet it was not without loss, for the subjugation of the Forge World marked the end of the Legion Honorum as a crusading Titan Legion, anchoring them to a single world ever since.