Land military units receive additional armor.
—In-game description

Hualcana is a Big Button technology in Age of Empires III: Definitive Edition that is unique to the Incas and can be researched at the War Hut once the Fortress Age is reached. Once researched, all Infantry and shock infantry will have their resistance (melee or ranged) increased by 10%. This can be particularly powerful when used with Minor Native units, especially ones with strong resistance to begin with, such as Chakrams.

With the Industrial Age Old Ways Home City shipment, the cost is reduced to 25 wood, 250 coin.

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