It was mentioned as a book that lists several true grimoires, with origins across a spectrum of religions, and it was used as a reference point throughout the episode.
In his book, Grimoires, A History of Magical Books, author Owen Davies names several.
— Episode: CLASSIC: Grimoires: Fact and Fiction
Episode: CLASSIC: Grimoires: Fact and Fiction
It was mentioned as a book that lists several true grimoires, with origins across a spectrum of religions, and it was used as a reference point throughout the episode.
In his book, Grimoires, A History of Magical Books, author Owen Davies names several.
And if you like this kind of stuff, go to grimoire.org. There is just a place where you can look up different Grimoires. They're listed out through a timeline as well with the purported written dates and throughout the centuries.