T2.1

The hallway snakes ahead of you and has no light source of its own.

Arrow Trap
Perception DC 20 There is a break in the stonework on the floor.

Disable DC 20: You follow the panel to a trigger and sever the rope. What ever it unleashed by stepping on this pressure plate, it won't anymore

Trigger: Stepping onto the 5' plate, arrows spring from above. +15 vs Flatfooted, 1d8+1 of all. And Kobolds run out:

From R2
The stench from the waste recedes as you walk along the corridor. Ahead of you are sounds of yaps and scuttling and the smell of something savory.

From R5
The further you walk along the corridor the more your nose picks up a stench of something foul.