Arcane Grimoire +1

While you are holding this leather-bound book,
you can use it as a spellcasting focus for your
wizard spells, and you gain a bonus to spell
attack rolls and to the saving throw DCs of your
wizard spells. The bonus is determined by the
book's rarity.
You can use this book as a spellbook. In addition,
when you use your Arcane Recovery feature, you
can increase the number of spell slot levels you
regain by 1.