Duplicitous Manuscript

To you, this book is a magical spellbook. To anyone else, the book appears to be a volume of verbose romance fiction. As an action, you can change the book's appearance and alter the plot of the romance. When found, the book contains the following spells: hallucinatory terrain, major image, mirror image, mislead, Nystul's magic aura, phantasmal force, and silent image. It functions as a spellbook for you.
While you are holding the book, you can use it as a spellcasting focus for your wizard spells.
The book has 3 charges, and it regains 1d3 expended charges daily at dawn. You can use the charges in the following ways while holding it:
If you spend 1 minute studying the book, you can expend 1 charge to replace one of your prepared wizard spells with a different spell in the book. The new spell must be of the illusion school. When a creature you can see makes an Intelligence (Investigation) check to discern the true nature of an illusion spell you cast, or makes a saving throw against an illusion spell you cast, you can use your reaction and expend 1 charge to impose disadvantage on the roll.

Item type

Magical

Rarity

Wondrous item, rare (requires attunement by a wizard)