Another step-and-fall trap, this one takes its name from the wide opening. The trapdoor springs back into place after discarding its useless victims.
Detect: Per-based Traps at -1.
Disarm: DX-based Traps at -5.
Circumvent: DX or Jumping at -2.
Evade: Dodge at -1.
Effects: 2d+2 impaling from a 7-yard fall for anyone on the 3-hex lip.