 Gargamel keeps a spellbook called the Great Book of Spells in the basement of his house; the book is a living, sentient thing capable of speech, and due to an unspecified agreement, it must provide Gargamel with any spell he requests one day a month on the final phase of the full moon.The book clearly does not like this arrangement and often takes Gargamel's requests too literally, while instructing him to gather ingredients and do rituals that humiliate him in the process.In one late season, it is suggested that the Book is not malevolent and simply does not like being used for selfish reasons, as it aids the Smurfs in undoing a magical disaster with very little fanfare.