Collapsing Floor Puzzle
Terrain
Level 21 TrapXP 3200

Detect Perception DC 19

Initiative

Immune attacks

Triggered Actions

Collapse At-Will

Trigger: A creature moves onto a tile that is not in the proper sequence.

Attack: Melee 1 (the triggering creature and each creature on the floor section); +24 vs. Reflex

Hit: The 10-foot-square section of floor underneath the triggering creature collapses. Creatures on that section of floor are caught between the rollers and grabbed (escape DC 26). A creature takes 40 damage each time it starts its turn grabbed by the rollers.

Miss: The target slides 1 square into an unoccupied square. If it cannot or does not do so, treat the miss as a hit.

Effect: The triggering tile pivots open and remains open until the end of the encounter.

Countermeasures

Disable: Thievery DC 26 (standard action). Success: The mechanism on a tile adjacent to the character is disabled, preventing it from opening. Doing so also prevents the tile from being used as part of the unlock sequence unless the character succeeds on the check by 5 or more.

Open Doors: After the adamantine doors open, the trap is disabled for as long as they stay open.

Reset: Thievery DC 20 (standard action). Success: The previously disabled mechanism on a tile adjacent to the character is reset so that it can collapse.

Published in Dungeon Magazine 215.