From Pathfinder #179: Cradle of Quartz, which isn't enabled.

Falling Portcullis Trap

HAZARD 7

Stealth +12 (expert) to spot the sockets in the floor where the portcullis drops; DC 28 Perception (expert) to spot the floor trigger

Description An iron portcullis drops from the ceiling when a pressure plate is triggered.

Disable DC 27 Thievery (expert) to disable the floor trigger, or DC 27 Athletics or DC 27 Engineering Lore to jam the portcullis in the ceiling

AC 25; Fort +15, Ref +18

Hardness 18, HP 72 (BT 36); Immunities critical hits, precision

Slam Shut

Trigger The pressure plate is depressed

Effect The portcullis falls, closing off the hallway. Any creature under the portcullis when it drops takes 4d10+18 piercing damage and is Immobilized. A creature that succeeds at a DC 26 Reflex save takes no damage and rolls away in a random direction; on a critical success, they can choose the direction.

If the trap was triggered by a creature moving north with a Speed of at least 10 feet, they're considered to be under the portcullis when it triggers. Creatures moving south when triggering the portcullis aren't considered to be under the portcullis when it triggers.

Pathfinder #179: Cradle of QuartzOGL