Good Witch's Spell Book

The Good Witch's Spell Book is a book filled with reversal spells and potions for the evil magic contained in its counterpart. It was used by Cassandra Halliwell and Demetria Parker to reverse an evil spell cast on P3.

Centuries Ago
A good witch created the book and filled it with reversal spells and potions to counteract her sister's, an evil witch, spells and potions that were filled in her book.

2032
The book was located at Magic School. Mrs.Thomas, one of the faculty, was able to know exactly which book to look for when Cassandra confirmed that Junior had been transformed into a goblin. The good witch was a teacher of Magic School and the book was never lost to time, like the evil one. Inside the good spell book was a potion to reverse the creature spell.

Trivia

 * The ingredients of the reversal potion are unknown.