Healers (Surgeons and Holy Men) have increased speed and hitpoints.
—In-game description

Mission Fervor is a technology in Age of Empires III: The WarChiefs that can be researched by European civilizations at the Church (Mosque for the Ottomans). Once researched, it increases the hit points and speed of Priests, Imams, Missionaries, and Surgeons by 35% and 15% respectively. Warrior Priests and Medicine Men are affected by this technology as well, although European players normally cannot obtain the latter (except for the Native variant).

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