Battle of Helsreach - Fall of Titans: During the final days of the battle, the bulk of the Legio Invigilata battlegroup present in Helsreach was fighting alongside Armageddon Steel Legion elements in the burning Rostorik Ironworks district. The Titans were embattled in the area for four solar days, having lost seven war engines over the course of a solar week.The Titan crews and the god-engines themselves were exhausted from fighting and required rearming and retrofitting. This took its toll on the war engines' performance, particularly the Stormherald 's, which was already acting unreliably under the shaky guidance of its princeps. The Titans sought to retreat to their bulk landers for maintenance, but Princeps Majoris Mancion agreed to only do so after identifying an unusually large heat signature appearing in the inferno consuming the city.She sent forward two of her Warhound-class Titans to investigate it. When the princeps of these war machines closed in on the target, the first of them was obliterated without even realising what caused its demise.The same fate befell its colleague soon after, but the latter caught a glimpse of the monstrosity -- an enormous Mega-Gargant known as the Godbreaker, a giant machine easily dwarfing the Stormherald.The Godbreaker had been initially constructed on the surface of Armageddon, to the north of Helsreach near the smaller industrial hive city of Stygia. Stygia possessed only its own Armageddon Steel Legion and militia forces, with no Mechanicus or Astartes support.Despite this, Stygia held out for over a solar month against the Ork force besieging it -- until the Godbreaker 's construction finished, and the metal beast was unleashed upon the defenders.From its birth, it took only five and a half solar hours to flatten the hive city and to decimate all Imperial forces within. From there, the Godbreaker strode towards the nearest centre of Imperial control -- Hive Helsreach.The Stormherald soon faced the mechanical monstrosity, as the Gargant's crew wished nothing else but to challenge the greatest opponent in their path. It destroyed the smaller god-engines comprising the Stormherald 's screen with ease, and was advancing upon the weakened Imperator-class Titan to end its existence with melee weapons.Mancion, because of the damage inflicted upon her Titan and the resulting psychosomatic pain and wounds she suffered in the MIU, was nearly completely useless, and the war engine was operated by its moderati, Lonn and Valian Carsomir. Their only chance was to finish the Mega-Gargant with a single, final shot of the Imperator Titan's Plasma Annihilator.Carsomir decided to fire the Plasma Annihilator as soon as it recharged against Moderatus Lonn's advice, without waiting for the Titan's Tech-adepts to bring the weapon's stabilisers back on line.Because of this, the barrel trailed off-target under the force of its shot, and the searing projectile it spewed out missed the giant xenos walker -- thus sealing the Stormherald 's fate.Princeps Maximus Mancion's resolve was the only factor that had pledged the Legio Invigilata battlegroup to Helsreach's defence, and when she was destroyed along with her Imperator Titan, the new acting commander of the Legio's forces on Armageddon -- Princeps Amasat -- had ordered the god-engines to withdraw from the hive city and rejoin the bulk of the Legio along the River Hemlock.