Fulminating Treatise

From Tasha's Cauldron of Everything, page 128.

Description
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, it contains the following spells, which are wizard spells for you while you are attuned to it: 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 a 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.