In Age of Empires II, Arrowslits is a university technology researched at the University. Watch Towers +1, Guard Towers +2, Keeps and Donjons +3 attack.
Plan Arrowslits in the Upgrade Codex →
Effect Watch Towers +1, Guard Towers +2, Keeps and Donjons +3 attack.
Cost
⏱ 25s Where to research Researched at the University.
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250 food
250 wood⏱ 25s