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Villagers gather from all resources slightly faster. The attack and hitpoints of all Units is slightly improved.
—In-game description

Gadaa System is a technology in Age of Empires III: Definitive Edition - The African Royals that is unique to the Ethiopians and can be researched at the Mountain Monastery once the player advances into the Industrial Age or higher by choosing the Oromo as their ally. Once researched, it allows villagers to gather 5% faster and increases the hit points and attack of all units by 5%.

Mountain Monastery technologies
Kebra Nagast Kebra Nagast · Book of Axum Book of Axum · City walls aoe3de icon City Walls · Solomonic Dynasty Solomonic Dynasty
Alliance technologies
Alliance Arabs ArabsBlue Nile Ties Blue Nile Ties · Yemeni Relations Yemeni Relations
Alliance Habesha HabeshaArk of the Covenant Ark of the Covenant · Timkat Timkat
Alliance Indians IndiansGoa Followership Goa Followership · Good Will Agreements Good Will Agreements
Alliance Jesuits JesuitsChristian Schools Christian Schools · Smokeless Powder Smokeless Powder
Alliance Oromo OromoIrreechaa Irreechaa · Gadaa System Gadaa System
Alliance Portuguese PortugueseChurch Organs Church Organs · Portuguese Crusaders Portuguese Crusaders
Alliance Somalis SomalisSomali berbera seaports Somali Berbera Seaport · Somali coinage Somali Coinage
Alliance Sudanese SudaneseSudanese red sea trade Sudanese Red Sea Trade · Sudanese quilted armor Sudanese Quilted Armor
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