The Great Book Of Spells

The Great Book Of Spells is an object that Gargamel possesses in the basement of his hovel which he uses at times to come up with potentially foolproof plans to capture the Smurfs when his own magical abilities fall short. The book rests on a lectern in an alcove flanked by two candles that light up when the spirit of the book is active. It first appeared in the episode "The Winged Wizard" in Season 3 and has appeared in various episodes up until Season 8.

The Great Book Of Spells can only be activated on the night of the final phase of the full moon, and from that point on will remain active for until the sun goes down the next day. Gargamel activates its spirit by saying, "O Great Book Of Spells, upon whose pages dwell secrets that no one tells...awake for Gargamel!", which causes its pages to open and the voice of the spirit to respond (usually in a condescending manner to its owner) to whatever request Gargamel asks of it. The spirit then gives Gargamel a sort of ritual that he must perform in order to have whatever it is Gargamel asks for (which usually the means to have it done materializes out of thin air). Usually, in Gargamel's case, the thing that he asks for hardly ever works out in his favor, usually as a result of him insufficiently explaning his requests for the book and/or the book interpreting them however it sees fit. Sometimes whatever Gargamel asks for does work, but ends up working against him by some flaw in whatever the Great Book Of Spells has given the wizard.

Although Gargamel tends to be the prime user of the Great Book Of Spells, Scruple and the Smurfs have at least in one episode used the book for their own purposes.

Empath: The Luckiest Smurf stories
In the EMPATH: The Luckiest Smurf story series, the Great Book Of Spells remained active until Gargamel, Azrael, and Scruple were driven out of the Smurf Forest for good, after which the book magically made Gargamel's castle disappear, burying itself so that it would never be used again by anyone.