Changes

Blacking out from Samus's emergence, Ventanus awoke to find the daemon wreaking havoc on Leptius Numinus, essentially ignoring the bolter and las, and plasma fire the Ultramarines, [[Imperial Army]], and Skitarii forces were concentrating on it, even destroying a [[Shadowsword]] and wounding Sullus in the process. Using Cxir's [[athame]], Ventanus was able to defeat Samus,{{fn|1o}}, but Leptius Numinus was virtually defenseless. Additionally, Ventanus realized that there was something toxic about the athames, and ordered Selaton to destroy them. However, Tawren managed to make an important discovery: her predecessor, [[Uhl Kehal Hesst]], had managed to formulate a [[killcode]] which could purge the [[scrapcode]] in a civilian data-engine in [[Lanshear]] which could regain control of the weapons grid. But to use it, they would need to destroy the Word Bearers engine being used to control the grid. A small force under Sullus and Serotid would remain to keep Leptius Numinus's data-engine functioning. Reestablishing contact with ''Macragge's Honour'', Ventanus was relieved to hear the voice of Roboute Guilliman, and managed to relay that the Word Bearers had a data-engine controlling the grid, but vox-contact was interrupted before Ventanus could say where the target was.{{Fn|1p}}

Moving toward the data-engine in Lanshear, Ventanus learned from the remaining forces at Leptius Numinus that reinforcements were being directed toward Lanshear, mainly the remnants of the 111th and the 112th Companies under Sergeant [[Anchise]].{{Fn|1q}} Ventanus managed to get Tawren to the data-engine,{{fn|1r}} but the 4th were nearly overwhelmed by [[Hol Beloth]]'s Host, and Ventanus himself was injured by one of the [[Gal Vorbak]].{{Fn|1s}} Just as all hope seemed lost, reinforcements arrived. They not only included the 111th and 112th companies, but also the 19th Company under Captain [[Aethon]], the Neride 51st under Lamiard, and [[Titan]]s under Tetrach [[Tauro Nicodemus]]. These forces were enough to hold the Word Bearers back long enough for Guilliman's kill-team to destroy the Word Bearers data-engine, allowing Tawren to retake the control of the weapons grid.{{Fn|1t}} Unfortunately, [[First Captain]] [[Kor Phaeron]] and [[First Chaplain]] [[Erebus]] had managed to conduct a ritual that left the star Veridia unstable and releasing human-lethal radiation. Evacuations were conducted, but not everyone could be evacuated in time, so Ventanus and the 4th Company stayed behind, and Ventanus vowed that the Ultramarines would keep fighting.{{Fn|1u}} The Imperials and the remaining Word Bearers were forced to fall back to the arcologies and cavern networks that littered the planet, beginning the phase of the Battle of Calth known as the Underworld War.{{Fn|1v}}