Fulminating Treatise

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.