These types of units are typically made available during the third age, known as the Castle Age. (Image via Relic Entertainment)Ī religious unit in Age of Empires IV involves a Priest or a Monk. The unit then needs to head to the sacred site and hold it for a short period of time to capture it.Īge of Empires IV: Capturing sacred sites using religious units A sacred site in Age of Empires IV. To capture one of these sacred sites, you'll need to have a religious unit available.