The material below is Open Game Content from a 3PP Source
Tome of Leadership and Influence
Aura strong evocation (if miracle is used); CL 17th
Slot none; Price 27,500 gp (+1), 55,000 gp (+2), 82,500 gp (+3), 110,000 gp (+4), 137,500 gp (+5); Weight 5 lbs.
This ponderous book details suggestions for persuading and inspiring others, but entwined within the words is a powerful magical effect. If anyone reads this book, which takes a total of 48 hours over a minimum of 6 days, he gains an inherent bonus from +1 to +5 (depending on the type of tome) to his Charisma score. Once the book is read, the magic disappears from the pages and it becomes a normal book.
Requirements Craft Wondrous Item, miracle or wish; Cost 26,250 gp (+1), 52,500 gp (+2), 78,750 gp (+3), 105,000 gp (+4), 131,250 gp (+5)