Sky book

The sky book, known in Japan as firmament book, is an item in Magical Starsign, and one of the five neutral magic books. Using it on a party member adds celestial swap to their neutral spell slot.

Usage
Teaches party members the neutral spell celestial swap.

Acquisition
Twigadamus after defeating Lt. Mugwort.

Description
Learn celestial swap, a planet-shifting spell that isn't affiliated with any sign.