Mine Floor (CR 18)

The floor below is in bad repair, but there are a few sturdy spots.

Type: mechanical; Perception DC 34; Disable Device DC 34 Trigger touch; Reset none

Effect

The sturdy locations in the floor have mines below them, which will trigger when applied with sufficient force, such as the weight of a PC. Setting off one mine causes a chain reaction. Mines (20d6 damage to targets below (DC 28 Reflex Save for half damage), plus an additional 5d6 falling damage); multiple targets (all targets on floor, or within 30′ of edge looking down, those on the ledge above may make a DC 28 Reflex save to avoid falling)