It could imprint the sealed person on the page and turn it into a "guide". The sealed person did not exist in a secondary space like Alice's ring but in the Wizard Tool itself!
In other words, even in other planes, these sealed transcendent creatures could still be summoned, similar to the Soul Artifact, Book of Ten Thousand Spirits, mentioned by the Immortal Banyan Dragon!
It was said that the Gargamel's Divine Soul Artifact was a thick book of fairy tales.
In this "fairytale book", all kinds of powerful transcendent creatures were sealed, such as werewolves, vampires, evil spirits, evil dragons, and even evil witches.
All of them had once been defeated by the Gargamel!
He used this method to turn these defeated opponents into his slaves.
With this book, the Gargamel had become an army by himself. It had left a great reputation in the various planes it had traveled to.