A sentiant magical book.

A leather bound, hard cover book, with silver linings in the shape of a face in its cover.

The White Grimoire is a sentiant magical floating book, created long ago by legendery wizard. In its heyday the book served as the wizards butler and assistant. The book acts as a magic user capable of casting spells independent of its attuned owner. The Grimoire can cast any spell that has been inscribed  in its pages a long as it doesn't exceed its capabilities and it has spell slots available, however it can only cast spells at their original spell level. 

Much like a regular wizard's spell book spells can be inscribed, learned and prepared from its pages, but its true power arises when deployed. (Copying a spell to the Grimoire follows the same rules as with regular spell books)

When deployed the book moves by floting around, it has a flight speed of 40 ft. During combat it takes an action to deploy the book if its not already out, otherwise it rolls its own initiative. Aside from its movement the book can only take an action per turn, no bonus or reaction. (It can cast spells considered as bonus actions as its sole action)

Dormant State:

The book looks somewhat dilapitated and torn, at a glance it would not appear as magical.

After centuries of abandoment the grimoire has lost a lot of its original power, along with some of its charisma, sanity and memory. In this state the book acts as a 3rd level magic user and innatly knows the following spells.

Cantrips: Mage Hand, Shocking Grasp, Light 

1st level: Identify, Detect Magic (2 slots)

2nd level: Hold Person (1 slot)

It also has the 3rd level spells Dispel Magic and Sending inscribed within its pages but can't use them.

Stats:

Str: 5 (-3)  Dex: 15 (+2)  Con: 10 (+0) Int: 15 (+2)  Wis: 12 (+1)  Cha: 13 (+1)

HP: 15
AC: 12
Spell Attack Mod: +4
Spell DC: 12

Skills: Perception +3, Arcane + 5, History +3, Religion +3, Persuation +3, Deception +4
Saving Throws: Inteligence +5, Wisdom +3, Charisma +3 

The book can be harmed by regular attacks, when its HP reaches 0 it closes and can't be opened until a long rest.
The book is imune to all conditions except grappeled and restrained.


Awaken State:

A new adventure or discovery into the Grimoire's past has had a surge of its memories return to it, with its old personality restored a new power is revealed. Now a 5th level magic user the book gains more spells (aside from the ones its new owner had inscribed within it) and spell slots.

Cantrips: Mage Hand, Shocking Grasp, Light, Fire Bolt, Mending

1st level: Identify, Detect Magic, Thunderwave, Magic Missile (4 slots)

2nd level: Hold Person, Invisibility, Blindness/Deafness (3 slost) 

3rd level: Dispel Magic, Sending, Tiny Hut (2 slots)

4rd level: Dimension Door (1 slot)

It also holds the 5th level spell Telekinesis inscribed within its pages but can't use it.

The Grimoire can now use the cantrip Mending in order to restore 1d6 of damage once per short rest.

Stats:

Str: 5 (-3)  Dex: 15 (+2)  Con: 10 (+0) Int: 16 (+3)  Wis: 14 (+2)  Cha: 15 (+2)

HP: 35
AC: 13
Spell Attack Mod: +6
Spell DC: 14

Skills: Perception +4, Arcane + 6, History +4, Religion +4, Persuation +4, Deception +5
Saving Throws: Inteligence +6, Wisdom +4, Charisma +4 

The book can not be harmed by non magical attacks, when its HP reaches 0 it closes and can't be opened until a long rest.
The book is imune to all conditions except grappeled and restrained.

Legendary State:

All the book previous aging and damage have been restored revealing a pristine tome, with beatiful pure silver desings in its cover.

With its full glory now restored the Grimoire has awaken its final power.

Cantrips: Mage Hand, Shocking Grasp, Light, Fire Bolt, Mending

1st level: Identify, Detect Magic, Thunderwave, Magic Missile, Protection from Evil and Good (4 slots)

2nd level: Hold Person, Invisibility, Blindness/Deafness, Knock (3 slost) 

3rd level: Dispel Magic, Sending, Tiny Hut, Fly, Counterspell (3 slots)

4rd level: Dimension Door, Greater Invisibility, Blight (2 slot)

5th level: Telekinesis, Legend Lore (2 slots)

6th level: Globe of Invulnerability (1 slot)

7th level: Magnificent Mansion (1 slot)

It also holds the 8th level spell Antimagic Field and the 9th level spell Foresight inscribed within its pages but can't use them.

In this new state the book also gains a reaction per round and the ability to cast spells with higher spell slots.

Stats:

Str: 5 (-3)  Dex: 16 (+3)  Con: 10 (+0) Int: 18 (+4)  Wis: 15 (+2)  Cha: 16 (+3)

HP: 70
AC: 15
Spell Attack Mod: +10
Spell DC: 16

Skills: Perception +7, Arcane + 10, History +9, Religion +9, Persuation +7, Deception +8
Saving Throws: Inteligence +10, Wisdom +6, Charisma +7 

The book can not be harmed by non magical attacks, when its HP reaches 0 it closes and can't be opened until a long rest.
The book is imune to all condition imunities, and can only be grappeled and/or restrained by magical means.
It also gains magic resistance, giving it advantage for saving throws against spells and other magical effects.

The Dm decides in which state the book is found and at what points it awakens further power, as well as which spells it may contain.

Notes: Requires attunement by a Wizard, Creation, Utility, Combat, Sentient