A band of European mercenaries, driven by the lure of black powder, journeys to China only to find themselves caught in an unimaginable battle. As they reach the Great Wall, they discover its true purpose—not just a fortress, but the last line of defense against a relentless horde of monstrous creatures. Forced to fight alongside an elite army of warriors, they must choose between fortune and fate in a war unlike any the world has seen.