As you raise the gate, you can see what appears to be six large bronze discs with a number of angled ridges encircling the sides, making them appear almost coinlike, and a perfect stone sphere laying on the hallway. After everyone clears their way into the room, Gur tries to pick up one of the ridged bronze discs...
Gur struggles with it for a minute, then gets it up... "I'd say about twenty pounds each. And the rock probably a little bit more, since it's so much bigger. What do you suppose these are?"