The Cookbook is a mysterious book Kelly, Hannah, and Derbie discovered in Kelly's attic one day. The book is filled with magical recipes that can do nearly anything, from healing an injury to boosting your intelligence.
The book was most likely created some point during the Medieval Times. It's unknown who exactly created the book, but clues point to the Traveler being the creator of it, as she is most likely immortal. At first, the book only had two keepers, but after the incident with Chuck, it was changed to three. And It blames the Traveler.