Ozutsu Unlock is a unique technology released with Age of Empires IV: Dynasties of the East. It is available to the Sengoku Daimyo at the Oda Clan Daimyo Estate beginning in the Castle Age, but can only be researched once three Oda Clan Daimyo Estates have been built. Researching it unlocks the Early Ozutsu at the Archery Range. Even if researched in the Imperial Age, it still unlocks the Early unit, which must be then upgraded to the regular Ozutsu through a separate upgrade.
