A Linking Book allows players to teleport between ages to the spot where the Linking Book was crafted. They are particularly useful when traveling between ages. Linking books are crafted simply by putting a single book in a crafting grid(Whatever area you craft the book is where it will teleport you back to when used). For example if I craft a Linking Book in the Overworld, if I used it while I was in an Age, it would teleport me back to the Overworld. Players cannot use a Linking book that would take them to the same dimension that they are currently in.
Note: Recipe is Shapeless