From the Back of the Core Book:
The world lies broken and cast in ruins. Humanity has been left staggering and sore, choking in the dusts of time, struggling to survive against a backdrop of religious wars and black rains. This is a shattered world, one that's been thrown back on itself at the height of the Civil War and left smoldering in a dark age from which it may never rise again. It's a turned world of six-shooters and superstition, walking fears, waking nightmares, and sudden death. A world of cracked leather and gun smoke, wasteland, and dust. A world where vile machines stir to life with steam power born of blood; where medicine men drug themselves into dreams of tomorrow, and pale-skinned beasts stalk in the mists. Here Baronies war over water and trade routes, Gunslingers ride in the shadows, and bullets buy whiskey quicker than gold... This is a world torn within the grip of a Cold Steel Reign.