You know about Zohar, Kabbalah, Talmud these are the hidden books. Hidden the sense that most don't even know they exist.
Look at the Key of Solomon https://en.wikipedia.org/wiki/Seal_of_Solomon Most don't know that the supposed great king practiced pentagram magic. https://en.wikipedia.org/wiki/Sefer_HaRazim more magic stuff

Here is another one https://en.wikipedia.org/wiki/Sefer_Raziel_HaMalakh