Quick Answer
Slot the diamond-shaped map sigils into the right-hand grid's slots 1–18 for the fourth Tome chest puzzle. Find Tome pages with the same border pattern and misplaced symbols. Look at what is highlighted on those pages for the clue.
Where are the diamond grid clues in the Tome?
Look for Tome pages whose border pattern matches the diamond grid. These pages contain symbols that are out of place. The matching border identifies the pages to inspect; the highlighted content gives you another clue.
For help finding other pages, use the Tome pages guide.
How do you approach the fourth Tome chest puzzle?
Inspect the matching Tome pages and their highlights before placing the map sigils in the numbered grid.
Find the matching borders
Open the Tome and find pages with the same border pattern as the diamond grid. Look for the symbols that are out of place.
Inspect the highlighted content
Look at what is highlighted on the matching pages. Use those highlights alongside the misplaced symbols as your clues.
Place the map sigils
Slot the diamond-shaped map sigils into the grid on the map's right side. The available slots are numbered 1–18.
Use the MONOMOON walkthrough for help with another progression puzzle. For the separate elevator obstacle, open the elevator puzzle guide.
FAQ
The fourth Tome chest uses the map's diamond sigils and clues on matching-border Tome pages.
Slot them into the grid on the right side of the map. Its slots are numbered 1–18.
Look for pages with the same border pattern as the diamond grid and symbols that are out of place.
Look at what is highlighted on those pages.
The diamond grid puzzle belongs to the fourth Tome chest.