The Cult of the Machine God has occupied this planet for several thousand years, ever since it was awarded to the Adeptus Mechanicus for its aid in repelling a nearby Ork uprising. Rich in promethium and other useful ores, this once-verdant world has since become layered with plasteel and pollutants. Factories many kilometres tall churn out a wide variety of armaments and munitions. Deep mines weave through the planet’s crust, so invasive that elaborate networks of cyclopean support beams are needed to buttress the immense weight of the manufactorums that cover the surface. Many of the Tech-Priests spend their entire lives underground, feverishly directing legions of servitors to maintain these complex metal webs.