T1.2

The path becomes narrower, first 8 then about 5 feet wide. The walls are rough and there is moss growing on the cavern floor.

Perception DC 22: The layer of moss growing on the floor looks undisturbed. Scale Walls: Climb DC 20
 * +5 there are small handholds carved into the rock walls, like rails.

If they continue walking without spotting anything, the floor breaks and reveals a 20ft deep pit.

Pit will collapse with 150 lbs of pressure. 2d6 falling damage, Acro DC 15 for 1d6 only.

From R1
As you walk along the curving pathway, the air begins to feel warmer the further you go.

From R3
As you walk along the curving pathway, the air begins to feel cooler the further you go.