From Pathfinder Adventure: The Fall of Plaguestone, which isn't enabled.

Spear Launcher

HAZARD 2

Stealth +10 (trained)

Description An old heavy crossbow is hidden in a pile of trash, loaded with a wooden spear, and connected to the rope holding the door.

Disable Thievery (trained) on the rope allows a PC to tie the rope off and open the door without setting off the trap.

AC 18; Fort +11, Ref +3

Hardness 8, HP 32 (BT 16); Immunities critical hits, precision

Spear

Trigger The rope is cut or otherwise untied from the door

Effect The trap makes an attack against the creature that manipulated the rope

Melee Spear +14, Damage 2d6+6 piercing

Pathfinder Adventure: The Fall of PlaguestoneOGL