Tome of Clear Thought

Wondrous item, very rare

• Weight: 5.0 lbs.

This book contains memory and logic exercises, and its words are charged with magic. If you spend 48 hours over a period of 6 days or fewer studying the book’s contents and practicing its guidelines, your Intelligence increases by 2, to a maximum of 30. The manual then loses its magic, but regains it in a century.

Source: Dungeon Master’s Guide (2024) p. 317. Available in the SRD and the Free Rules (2024)