Level 2 TrapXP 125
Detect Arcana or Thievery DC 20Initiative -
Trigger: A creature steps on the 10-foot-square trapped section of floor.
Effect (Immediate Reaction): The trapped section of floor disappears. Any creature or object on the floor falls 10 feet, taking 1d10 damage and falling prone in the room below. The vanishing floor immediately rematerializes.
Disable: Arcana or Thievery DC 20 (standard action). Requirement: The character must be adjacent to the trapped section of floor. Success: The trap is disabled for 10 minutes.
Published in Halls of Undermountain, page(s) 85.