Weakened Floor over Green Slime Pit CR 7
Source: Pathfinder Adventure Path #34
Any object weighing more than 50 pounds causes the floor to collapse, dropping anyone in the area of the trap 40 feet into a chasm filled with green slime.
Trigger location; Reset none
Effect 40-ft.-deep pit (4d6 falling damage plus green slime); DC 25 Reflex avoids; multiple targets (all targets in a 10-ft. line)