Bookstore section, perhaps
Else clues• Alchemical, astrological, etc.
• Alternative bookstore section
• Arcane practice
• Beyond the range of ordinary knowledge
• Black magic
• Bookstore genre
• Cabalistic
• Dark arts
• Dealing with the supernatural
• Esoteric
• Hidden
• Hidden and difficult to see
• Inscrutable
• Like a happy medium?
• Like arts taught at Hogwarts
• Like hidden lore
• Like magic
• Mysterious
• Mystical
• Mystical science
• Of alchemy, astrology, etc.
• Of the mystic arts
• Paranormal
• Pertaining to magic or astrology
• Secret
• Supernatural
• Supernatural forces and events and beings collectively