This fell tome's origins are unknown. Wherever it came from it contains secrets of magic from before the multiverse was created. When you attune to this spellbook you do so by spending an entire long rest reading it from cover to cover. Once you start reading you can not stop until you finish. You gain no benefit from the long rest and gain a level of exhaustion. As you read the book burns knowledge into your mind. You gain proficiency arcana, history, and nature if you don't already have them. You also learn an archaic dialect of infernal which boost the potency of your spells when used in casting. While you are holding this leather-bound blood-stained book, you can use it as a spellcasting focus for your wizard spells, and you gain a +2 bonus to spell attack rolls and to the saving throw DCs of your wizard spells.

The reading of this book also fractures your personality. You gain a second persona which is diametrically opposed to your current personality. (if you are kind the new persona will be cruel for example) Whenever you drop to bellow 50% hit points you must make a DC15 Wisdom saving throw, on a failure the alternate persona takes over control of your body until your hit points are brought above 50%.

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.

Notes: Bonus: Spell Attacks, Bonus: Spell Save DC, Proficiency: Arcana, Proficiency: History, Proficiency: Nature, Language: Infernal, wizard