The world called Sacris by its inhabitants is classified as a Forbidden World by the Adeptus Terra and is located in the Drusus Marches Sub-sector of the Calixis Sector of the Segmentum Obscurus of the Imperium of Man. It is the homeworld of the Storm Wardens Chapter of Space Marines and is also home to a population of pre-industrial humans who hold a great similarity to the culture of the people of Old Earth known as the Highland Scots. Its geography is overwhemingly dominated by fog-enshrouded highland moors and dismal swamps.