The tunnel downward is no more than 5’ wide and about 70’ long. It drops steeply from the Large chamber. The tunnel that Kel used to enter is very close to it, leading upward.
The walls of the passage are earth and dirt, it turns to avoid boulders or solid rock. Except in the middle where one rock is carved out to a sharp corner.
Finally, it opens out into a stone chamber. Thin stone bars stop you from entering. The room is immaculately clean, smooth stone walls, ceiling, and floor, with no loose rocks or even dirt.
On the far side is a cage 5’ high 10’ across, with thick stone sides and top, with a shaped lattice of stone bars in front. It has no hinges or other obvious way of opening.
Inside the cage is a large blue-white creature – it looks like a manta ray (not that your characters have ever seen one) but it floats bobbing back and forth inside the cage.
It occasionally flaps its wings, but mostly just levitates there. It’s wingspan is 7’ across, but the main body no larger than plool.
The other thing that catches your eye is a large gold mask. It is held to the wall by stone protrusions, where it cannot be seen from the cage.
Nature or insight checks may tell you more about the creature.
Kel notices that the mask is battered and bent, and his keen eyes pick up scratches and imperfections in the otherwise clean stone chamber. It looks like the mask was flung around the chamber, battering at the walls and bars before being securely mounted.
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