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Is there a way to reset the age, deleting the book doesn't work
How do I reset an Age to its initial state? https://eblong.com/zarf/uru/newfaq.html#age-resetYou will almost never need to do this. It should always be possible to turn off or reset the devices inside an Age -- either the same way you turned them on, or by some alternate means.
However, if a bug or some other problem has truly made an Age unplayable, there is a procedure for resetting it. This will undo everything you have done in that Age -- machines will be off, puzzles will be unsolved.
First, you must delete your existing linking book. Go to your Relto bookshelf. Click the "remove" tab below the Age book. (This tab (at bottom of a book) is marked with the symbol of a square with a dot inside.) Confirm that you want to delete the book. The book will slide inwards. Leave it there.
Now, go back to where you found the book originally. (For example, if you are resetting Gahreesen, go to the Relto pillar that held it. The pillar will be open.) Use the book. You will enter the Age at its beginning.
Note: this procedure does not reset your Journey progress. Cloths you have touched are still counted as touched.
Some Ages cannot be reset: the City, the Cleft, Nexus, the Neighborhood. (The Neighborhood "remove" tab is used to switch Neighborhoods or create new ones. See "How do I change my home to a different Neighborhood?" "How do I create a new Neighborhood?")