This is an unusual spellbook in that it stores three spells from three different schools of magic: Pagan Necromancy, Sorcery, and Theurgy. It also does not display a count of how many scrolls it contains. It can store three spells:
Caution should be exercised when loading scrolls into this spellbook. If you drag a stack of any of those three scrolls onto the Pagan Spellbook, it will eat all of the scrolls. Make sure that you are only dropping a single scroll!