Living Spellbook

Wondrous item, rare (requires attunement by a wizard)

This magic book holds hundreds of pages, half of which contain arcane scribblings in a neat handwriting. You can use this book as your spellbook and scribe new spells into it. Creatures that have advantage on saving throws against spells don’t have advantage against wizard spells you cast while holding this spellbook.

Master Wizard. The spellbook is sentient and has the personality of a master wizard. Its alignment is determined by the GM or by rolling a d4; 1: neutral good, 2: lawful neutral, 3: chaotic neutral, 4: neutral evil. The book has an Intelligence of 18, a Wisdom of 12, and a Charisma of 10. It speaks, reads, and understands Common, Draconic, Elvish, and Infernal, and can see and hear normally out to a range of 60 feet. While the wizard’s sentience within remembers nothing of who it was in life, it still possesses a wealth of knowledge. If you spend at least 1 minute discussing an arcane topic, such as a mythical event, a spell, a creature, or a magic item, with the spellbook, you gain advantage on any Arcana, History, Nature, or Religion checks pertaining to that topic.

Impromptu Memorization. As a bonus action, you can replace one of your prepared wizard spells with a different spell scribed in the book as the spellbook whispers the spell’s incantation to you. Once used, this property can’t be used again until the next dawn.