In the Cthulhu Mythos, the Necronomicon is a book detailing the identities, names, and lore of the Great Old Ones, the means to summon them, and other dark and forbidden lore.
Lore: The Necronomicon, originally titled Al-Azif, was authored by the mad Arab, Abdul Alhazred, in 738AD. Shortly afterwards Alhazred was believed to have met a mysterious and tragic death. According to biographer, Ebn Khallikan, Alhazred was attacked and dismembered by an invisible entity, presumable a punishment for authoring the forbidden tombe.
Since 738AD, the Necronomicon has been secretly passed down, translated into various languages, and generally kept hidden due to the power contained in the text. Currently it is believed that only 5 copies of the book are left in existence, with the most famous copy being kept at Miskatonic University in Arkham, Mass.
As a general rule of thumb, anyone attempting to harness the powers of the cursed book soon meets a tragic, and quite painful, death. Those who manage to survive are usually driven insane by the horrible knowledge they have gleamed from pages of the Necronomicon.
Appearance: Lovecraft gave very little detailed descriptions of the Necronomicon, though modern authors and film makers have portrayed the book as being handmade with a leather cover made from human skin.
Powers: Too evil and horrible to detail. However, the Necronomicon has the incantations and spells needed to summon the Great Old Ones and possible lead to their return to earth and subsequent destruction of earth.
Fakery: The Necronomicon is 100% fiction. The Necronomicon is a literary device created by H.P. Lovecraft as a means of uniting various storylines. This said, there is a considerable amount of people who believe the book actually exists. Such people tend not to be convinced by the fact that even Lovecraft himself admitted to his inventing the book. Currently, one can purchase many versions of the so-called real Necronomicon though each and every one is a forgery or a creation of authors who wish to blur the boundaries between reality and fantasy.
Although the Necronomicon is fiction, the book is likely inspired by various magical grimoires which did and still do exist.
Necronomicon: Some Facts About A Fiction (From the Church of Satan, Scary! LOL)
To view one of the most popular fiction "Necronomicon" book, the Simon Necronomicon, click HERE.
FYI: I used to own a copy of this particular book. I got it at the mall, in the 90s, for, I believe only $4.99. -As if the most evil book in existence, the book containing the power to destroy the world, can be bought for under $5 dollars. LOL I threw it in the trash, not because it was evil, but because it was so very inane and silly.