In Age of Empires 4, Relics are golden items that (mostly) can be placed in a Monastery or an equivalent building for other civilizations. For every Relic obtained and stored, Age of Empires 4 players will get 100 Gold every minute, and the money is obtained passively.
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A small upgrade in the Monastery will grant players Food, Wood, and Stone in addition to the Gold. All in all, securing Relics doesn't change the tide of war, but it has
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