The Necronomicon has been discussed before it's basically a series of books. Why a series because there is different creators perhaps a specific book but over time information changes. Technically the Necronomicon can be far older than we think perhaps some dating back nearing year zero A.D. either before year zero or slightly after year zero.
The Necronomicon is called book of dead names because we didn't kabalistically vibrate them en masse and only secretive even in meditation friendly countries for a long time for anything from materialization to spiritual development. For example the Nanna and Inanna vibrations for the female chakra areas. Another example are spiritual stories like Ahab's craziness when people invoke the Kundalini on some level you can argue it works both ways both to the person messing with Kundalini and not working for Satan perhaps some modern day christards messing with that. And to the person who is dedicated and needs to realize the madness will pass in time, that it's a normal process.
Another aspect are the Necronomicon energies more than likely devonic energies(Deva-God energies) for example despite the fact it has been stated that the binding circles for these specific glyphs or sigils can be positive in the sense it holds the energy internally(in the soul). At the end of the day since binding circles are viewed en masse so negatively you can visualize it without the circle and work with the energies. So the Necronomicon sigils can manifest either a physical reality or a spiritual reality like working on a chakra.
Again it's pretty much in the case of the book a safe way to spiritually advanced. Meditate from top to bottom later bottom to top when opened up properly. And it's basically a Bible, while the Bible is a book of jewish witchcraft for (((their))) benefit. The Necronomicon is a book of Satanic witchcraft for )))our((( benefit such as money or chakra work or timing astrological events to procure either a spiritual or physical manifestation.
It's not the only book I guess you could argue countless books destroyed by the enemy. But it's the most popular surviving version still in existence the problem is people believe it to be literal and it's supposed to be allegories of spiritual development. Much like even the enemy Bible they view it literally and not in the Occult levels such as the Talmudic, Merkava, Kabalistic view. Same for our book people believe the Kundalini to be some sort of dragon creature like in the stories of Kuthulu. Yes your expressing the spiritual side literally that is nice and all but your not exactly being correct. Despite the fact that in all the literalization, the truth always sits with those who know the real occult deal. At the very least even in the negative literal it attracts people to the truth.