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What's missing from the wall in the burial chamber?
Hint 1
Hint 2
Hint 3
Hint 4
4 hints available
Hint 1
It's hard to tell what shape it is, but I'll give you a clue and tell that you don't have it in your inventory when you open the chamber. Keep looking.
Hint 2
You'll find what you need in another room that you haven't found yet.