Another trap that springs a scythe when you step on a floor tile. For added variety, Sprugtooth recommends making this blade rusty and making the victim resist HT-3 or get tetanus.
Detect: Per-based Traps at -3.
Disarm: DX-based Traps at -3.
Circumvent: Per-based Traps at -5 finds the hidden switch.
Effects: 1d+4 cutting.