Bronze Age
Combine Copper and Tin Ingots to create Bronze Ingots at the Smelter. Build a Forge and craft superior Bronze Tools, Weapons and Armor. Assign Generals to instruct your people at the Training Grounds and form Armies to defend against incoming attacks or clear Bandit Camps that settle on work sites and block production. Build Temples and hire Priests to get rid of Curses and receive Blessings. Craft Paper at a Papermaker and turn it into Paper Manuscripts at the Library to improve Writing. Build Stone Walls and Stone Towers for better fortifications, as armies become larger and more aggressive.

Bronze Tools

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An alloy combining copper and tin, an extremely rare metal, ushered in a new era. Bronze was tougher and more durable than other metals available at the time, providing a technological advantage to any civilization that traded or produced it.
Copper and tin ingots can be combined to make bronze ingots. A blacksmith can turn them into weapons, tools, armor, and other metallic objects.
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Weapons and Armies

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Conflicts between neighboring factions were unavoidable as city-states expanded in population and territory. Rulers would enlist their subjects in the army in order to gain territory, but their campaigns were short because farmers had to return to the fields in spring and autumn.
Neighboring states hire bandits for sabotage and send armies to siege cities in an attempt to weaken each other.
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Advanced Writing

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Writing was revolutionized by the invention of paper. Manuscripts were more easily preserved in casings than clay tablets, and they took up less storage space. Although schooling remained an elitist occupation, an increasing number of individuals learned to read and write.
Paper can be manufactured by spending wood at a papermaker. Afterwards it can be used at the library for writing . Scholars improve all knowledge related activities.
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Ruling Elite

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As city-states got larger, class distinctions became more apparent. Rulers, military generals, and religious leaders began to wield far greater power as corruption was setting in. Even when fear-induced, authority would bring discipline and predictability to the subject's behaviour.
War generals, priests, and scholars are found in almost all Bronze Age civilizations. They have the ability to make significant military, cultural, and technological advancements.
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Temples

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As the ruling class started to gain even more power, monarchs began to claim to be the incarnations of the Gods and places of worship gradually increased in size and became more sophisticated.
Temples can attract pilgrims to culturally advanced cities by inspiring awe. They can also provide burial services to the general public.
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Advanced Fortifications

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The dangers of conflict seemed near as armies mustered on the horizon. To better protect settlements from impending sieges, stone walls and lofty towers began to be built around them.
Stone walls and towers require a lengthy construction process, but they can help cities to avoid huge losses. Without siege engines, attacking armies are forced to fight at a disadvantage.