You choose the right Pharaoh and the wall rises to reveal the final chamber.
At the end of the room you see four canopic jars, one of which is the jar of eternity. Standing above them is Rufus and his henchmen, he beat you here and is about to get his hands on the jar!
Luckily they haven't noticed you yet. Thinking on your feet you distract them momentarily and rush towards the canopic jars. You will need to choose quickly the correct one!