Tome of Potential

This book contains magical potential, brimming
with boundless knowledge waiting to take shape.
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, one Attribute score increase by 2,
as does your maximum for that score. The
Tome then loses its magic, it's words and magic
fade, becoming blank and inert.