It's a book of everything that has been forgotten. It appears in the Pilot with the same name and appears in the final chapter of Over the Garden Wall.

Tome of Unknown

It was planned to be an important Object in the Pilot as Narrator said if was treat as original plot for series. Put scapped in mini-series for maybe time limited.

Wirt, Greg and Beatrice hope to find this book in the Tome of the Unknown. - Pilot Narrator

Over The Garden Wall

Put however the book did only appears in final episode of Show with Lorna reading it.

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