The Death Korps of Krieg is the name given to all of the Astra Militarum regiments that originate from the devastated, post-nuclear Death World of Krieg in the Segmentum Tempestus. Krieg was the site of a rebellion against the Imperium of Man over 1,500 standard years ago in the 40th Millennium and was bombarded with nuclear weapons followed by five hundred Terran years of grinding warfare to purge the heretical rebels. After all those years of nuclear destruction and bitter trench warfare, Krieg was reduced to a scorched, radioactive husk of a world composed of dust and mud whose surviving people were forced to retreat into underground hive cities to survive the toxic planetary environment.