A Civilization advance.
Building hotter forges than they needed for bronze working, ancient smelters developed iron working, the manufacture and fabrication of a much more useful metal. Iron ore was extremely common compared to copper and tin, and worked iron was harder, less brittle, and could hold a much sharper edge. It was an ideal material for tools and weapons.
Prerequisites: Bronze Working.
Allows for: Gunpowder and Bridge Building.

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