The Upper Chamber is located in A Small Pyramid, and opens during the Quest for the Holy MacGuffin.
A primary stat of 150 is suggested. If your main stat isn't high enough, you'll see the following message:
(It is recommended that you have at least 150 <mainstat> to adventure here.)
- The silence of the tomb is broken only by the slithering of venomous snakes and the skittering of plague-ridden rats. Dare you disturb the dust of centuries?