Tome of Clear Thought 5e
Wondrous Item, very rare
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 score increases by 2, as does your maximum for that score. The manual then loses its magic, but regains it in a century.
Commentary by Sam West, Twitter: @CrierKobold
Where the Manuals boost your physical body, the Tomes are here to boost up your maximum and current mental scores. The Tome of Clear Thought mainly serves artificers and wizards a way to further expand their spellcasting, making it something basically every member of those classes wants.
Normally a character can’t improve a score above 20; this increases that maximum to 22, even if it doesn’t increase the score above 20 when used.
Only one character can benefit from a Tome per century; multiple characters can’t study the book simultaneously to both gain its ability score improving effects.
48 hours divided over six days results in six eight-hour sessions daily at minimum, which can be doable while adventuring should you only need to be physically adventuring 8 hours a day.
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