Calderia was once little more than another miserable Hive World of the Imperium of Man, home to billions of downtrodden factory workers and vile underhive scum, but the "tranquility" of this world was sorely broken by the ravages of horrid Tyranids of Hive Fleet Chimera. Though valiant Space Marines of the Marines Baleful landed to aide the PDF in stemming the tide, an unknown threat came from the stars, the King-Goy... who came with the full intent of purging this world and all those on it in fire... lest the Great Devourer escape.