A dark red book with a horrified face etched into its cover.
Upon activation, all enemies in the room will be damaged.
- Like the XIII Death Tarrot Card, the book will not work on Death.
- Triggering the effect of the trinket A Missing Page will also count towards unlocking The Necronomicon.
- The Necronomicon is a fictional grimoire appearing in the stories of horror writer H. P. Lovecraft.
- It is believed to be bound by human skin, explaining the face on the cover.
- The book bears a strong resemblance to The Necronomicon in the Evil Dead series.
- Using the Necronomicon on a Mask + Heart will only kill the 'masks', leaving the hearts with no purpose but as an enemy.