This first of two linked Narrative Play games of Warhammer 40,000 sees a Chaos Space Marines army attempt to infiltrate an Adeptus Mechanicus stronghold deep in the Nachmund Gauntlet. Their goal? To corrupt the Throne Mechanicum of a mighty Imperial Knight Castellan in the name of the Ruinous Powers. Can Simon's Skitarii patrol thwart the efforts of enemy general Nick's warp-touched force?