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The film begins by introducing two European mercenaries, William Garin and Pero Tovar, who have journeyed through the desolate terrains of China for over six months in search of a legendary black powder. This mythical substance is rumored to transform air into fire, capable of annihilating entire battalions with unprecedented efficiency. However, the mercenaries are relentlessly pursued by bandits, forcing them to hide in a cave. As they take stock of their dwindling supplies and morale, Tovar advocates retreat, but William insists on pushing forward.