adeptist
/aˈdɛptɪst/ /əˈdɛptɪst/rare after early 18th cent
noun
A person who has attained knowledge of the secrets of alchemy, magic, and the occult, especially a skilled alchemist.
Origin
Mid 17th century; earliest use found in John Chandler (b. c1625). From adept or its etymon classical Latin adeptus + -ist.