Source: Tasha's Cauldron of Everything

Wondrous item, rare (requires attunement by a wizard)

This thick, scorched spellbook reeks of smoke and ozone, and sparks of energy crackles along the edges of its pages. When found, the book contains the following spells: Contingency , Fireball , Gust of Wind , Leomund's Tiny Hut , Magic Missile , Thunderwave , and Wall of Force . 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 evocation school.
• When one creature you can see takes damage from an evocation spell you cast, you can use your reaction and expend 1 charge to deal an extra 2d6 force damage to the creature and knock the creature prone if it is Large or smaller.