Sanctity is a technology in Age of Empires II that can be researched at the Monastery. Once researched, it increases the hit points of Monks and Missionaries by +15. Even though the ingame description states that Sanctity gives +50% HP, it is actually always just a bonus of +15 hit points (it does not stack with other bonuses for Aztec Monks or Spanish Missionaries). Sanctity is available to all civilizations except for the Berbers, Mongols, Persians, and Vikings.