Everyone stands ready as Ovid nears the end of the incantation. The serpents, for now, have stayed away and Astrafel still sings through it all.
Finally the Wizard reaches the end of the ritual phrases and is quiet. There's a moment when it seems like nothing is going to happen, but then:
The huge stone at the center of the chamber with Sorenji's throne begins to move. It turns, slowly, stones moving in utter silence except for the clatter of books and stones. The stone stops after a quarter-turn and all is still for a long moment. Finally, the entire block, a dozen feet across begins to descend very slowly down into the round shaft revealed to you only as it passes.
It takes some time, the round shaft is smoothed stone, stained with long running strips of mold and watery stains which must have seeped through the seams over the ages. As the stone passes, a number of stones extend from the sides in a spiral, one at a time sliding out into view and creating a somewhat frightening spiral stair around the perimeter with nothing but air between the steps.
The stone continues, how far can this shaft go?
What do you do?