Necromunda : Core Rulebook

Necromunda. This hive world was founded over 15,000 years ago, as a mining and manufacturing colony. In the millennia since, the planet's mountains have been reduced to rubble for the ore within, its seas turned into oceans of chemical sludge, its very air poisoned with radioactive filth. Teeming billions infest its vast hive cities, from the glittering spires to the bowels of the underhive, a maddening mass of humanity that lives, works, fights, and dies without ever seeing the light of day. In the world beyond, outlaw gangs and nomadic tribes war endlessly over trade routes across the irradiated ash wastes.