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You are trying to decide whether to try prising open the door, when you hear the sound of stone grating on stone. The door slowly opens to reveal a large chamber. It is dimly lit, but in the thick dust which covers the marble floor you can see innumerable footprints.
Then, as you enter, you catch sight of a rough stone throne, facing the wall on the far side of the chamber. Behind you, the stone door slides shut with unnerving speed.