Tome of Understanding
Wondrous Item,
Very Rare
(cost 20000 gp)
Crafting Components
Parchment made from an ancient tree in the Dreaming
This magical book contains lessons and practices for enhancing intuition, empathy, and awareness. Spending 48 hours over 6 days (or fewer) reading and memorizing the book’s lessons increases your Wisdom score and your maximum Wisdom score by 2. The tome then becomes a mundane item for a century before it regains its magic.
Source