In the civilization overview, the team bonus is shown at the bottom. Seen in Age of Empires II: Definitive Edition.

The same screen, seen in Age of Empires II HD: The African Kingdoms.

A team bonus is a specific civilization bonus in Age of Empires II that applies to both the player's civilization and those of all allied players from the start of each game.

Two of the same civilization's team bonuses do not stack, but a team bonus can stack with another bonus. It is also important to note that should a player be defeated or resigns, their team bonus remains active for their allies. However, In diplomacy games (with no locked teams), team bonuses do not affect allies. This is because team bonuses function as a technology that is researched at the beginning of the game, and as such, changing allies mid-game will not transfer the team bonus. A team bonus can be applied in a diplomacy game if players set their team at the beginning of the game.

The following list shows of team bonuses.

Note that while not technically a team bonus, the Berbers' Castle Age unique technology Kasbah can be considered a team bonus as well since it, like regular team bonuses, affects the entire team. Unlike normal team bonuses, the effects of Kasbah stack if multiple Berber teammates research it. The Vietnamese, Cumans, and Sicilians also have unique Imperial Age technologies that benefit the entire team: Paper Money, Cuman Mercenaries, and Scutage. But since they are only one-time use, it is arguable whether they can be considered team bonuses.

Out of all 48 unique units in the game, three are available as team bonuses: the Condottiero, Genitour, and Imperial Skirmisher. These are often used to supplement lacking unit lines (for example Condottieri can make up for the Persians' lacking Militia line, and Aztec Imperial Skirmishers surpass the Aztec Arbalester), or to cover a niche, such as a late Imperial Age trash game.

It should also be noted that although the bonuses are referred to as "team" bonuses, they do apply in 1v1 games. However, two of the team bonuses, the Portuguese free Cartography and the Spanish +25% gold from Trade Carts, are entirely useless in 1v1 games.

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