In the great Hive Cities of Necromunda, most people never see the outside world. They never see the sun, or breathe air that hasn't already been breathed by hundreds before them. and recycled over and over again. Of course, most people are happy living like this, or are at least aware that outside the Hives life is very different indeed. The whole surface of Necromunda is covered in a massive ash desert, full of toxins and corrosive chemicals. The sun is almost completely blocked out by a planet wide layer of toxic smog. Howeveq for some people this is life. Where most Necromundans would die, the Ash Nomads traverse the ash dunes, up to hundreds of miles from Hive to Hive.