From Pathfinder #186: Ghost King's Rage, which isn't enabled.

Skewering Hall

HAZARD 19

Stealth +37 (master)

Description A dozen spears hidden within sockets in the walls thrust into the hall when the pressure plate is triggered.

Disable DC 47 Thievery (master) to disable the pressure plate

AC 43; Fort +35, Ref +29

Hardness 32, HP 130 (BT 65); Immunities critical hits, precision

Skewer (attack)

Trigger Pressure is applied to the pressure plate

Effect A dozen spears extend into the hall, making one spear Strike against each creature in the hall, up to a total of 12 spear Strikes.

Melee Spear +40, Damage 8d10+40 piercing

Pathfinder #186: Ghost King's RageOGL