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Alchemist is a 
Promotion for the Priest from the Path to Nirvana scenario in Civilization VI.
Effects[]
+7 
Religious Strength in Theological Combat when defending in Woods, Rainforest, Hills, or Marsh.
Civilopedia entry[]
Alchemy is an ancient discipline, often incorporating esoteric or mystical elements and practices. These provide fascinating insight into the practitioners, but are less helpful in describing how chemistry works.