Wondrous Item

Legendary requires attunement by a wizard Requires Attunement

Several of these spellbooks with gilded pages and silver-plated covers were created during ancient times, but only one is said to have survived the battles for which they were first made. The book has an infinite number of pages, is three inches thick, eight inches wide, twelve inches long, and weighs three pounds.   Dormant. Most of the book is blank, but the following spells are recorded in the first pages of the tome: alarm, antimagic field, Bigby's hand, blight, charm person, confusion, control weather, create undead, detect thoughts, enlarge/reduce, fear, foresight, gaseous form, glyph of warding, legend lore, Leomund's tiny hut, mass suggestion, mislead, misty step, Mordenkainen's faithful hound, prismatic spray, ray of enfeeblement, silent image, teleport, and thunderwave.
You can use the grimoire as your spellbook, and you can scribe new spells into it as normal. When you prepare wizard spells using the grimoire, the number of wizard spells you can prepare increases by 1.