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Bottomless Pit

Bottomless Pit 9

Magical Mechanical Trap

Complexity: Simple
Stealth: DC 30 (or 0 if the trapdoor is disabled or broken) or detect magic
Description: An iron trapdoor covers an infinitely deep 10-foot-square pit.

Disable: Thievery DC 28 (trained) to remove the trapdoor
The pit contains many handholds, so the falling creature can try to Grab an Edge again every 6 seconds. If the creature succeeds, it can start to Climb out from that point (though it might be a very long climb, depending on how far the creature fell). Since the creature falls endlessly, it can rest and even prepare spells while falling, though items dropped while falling are usually lost forever.
AC: 28 Fort: 12 Ref: 12
Hardness: Trapdoor Hardness 9 Hp: Trapdoor HP 36 (BT 18) Immunities: critical hits, object immunities, precision damage

Infinite Pitfall Trigger: A creature walks onto the trapdoor Effect: The triggering creature falls in and continues to fall, potentially forever. That creature can try to Grab an Edge to avoid falling. The DC to Climb the walls or Grab an Edge is 26.

Reset: The trap still causes creatures to fall forever if they fall in, but the trapdoor must be manually for the trap to become hidden again.

Source: Core Rulebook pg. 524 2.0