A strange phenomenon descended upon the world. From distant lands, a mass of black smoke surged forth and swallowed the sky. The smoke that blotted out the heavens blocked the sunlight itself, erasing the boundary between day and night. Most plants and animals perished, and humanity fell into a catastrophic famine. The Pope vowed to uncover the truth behind the black smoke and promised a great reward to whoever could put an end to it. In response, countless expeditions set out, stepping boldly into the depths of the darkened haze.