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Grants 1 Maceman for every 4 minutes of game length, up to 30 minutes.
—In-game description

Royal Festival is a Big Button technology in Age of Empires III: Definitive Edition that is unique to the Incas and can be researched at the Community Plaza once the Fortress Age is reached. Once researched, two Macemen immediately appears in the Home City shipment point, followed by one Maceman for every four minutes the game have passed, up to 30 minutes (for a total of 9 Macemen).

Each Maceman costs 300 resources. In terms of total resources spent, this technology breaks even at 4 Macemen delivered, which requires 16 minutes of game time to have passed.

With the Industrial Age Old Ways Home City shipment, the cost is reduced to 150 food, 200 wood, 250 coin.