my entire being YEARNS for sth similar to John Fowles’ “The Magus”

I am on my knees. Please recommend me a novel that has similar themes, exceptional writing, style, philosophy, just a full package of literary DELIGHT like I could find in this amazing work

I particularly loved the many twists, Conchis' and the girls' hidden agenda, the "trial" and its dramatic decor, costumes and the theater of it all

It could also be similar to Eyes Wide Shut (I am aware it is inspired by Traumnovelle)

Help! It could be anything, give me a medieval horror, give me an alien conspiracy, give me a historical thriller

Thank you