From Pathfinder Adventure Path: Hell's Destiny, which isn't enabled.

Haunted Knife Collection

COMPLEX HAZARD 11

Stealth +23 (master) or Detect Magic

Description Crates of knives and daggers shine with ill intent.

Disable DC 26 Religion (master) to exorcise the spirits, DC 33 Crafting (expert) to damage the knives, or Dispel Magic (5th rank; counteract DC 29) to counteract the crate

AC 31; Fort +18, Ref +24

Hardness 10, HP 80 (BT 40); Immunities critical hits, precision; Weaknesses area damage 10, splash damage 10

10,000 Stabs (magical)

Trigger A living creature touches one of the crates

Effect A cloud of knives rises from the boxes in a 10-foot radius around the touched crate and stabs all creatures in its area, dealing 10d4 slashing damage (DC 34 basic Reflex save). The hazard then rolls initiative.

Speed

Fly 15 feet

Melee Dagger +24 (magical, versatile p), Damage 10d4 piercing

Routine (3 actions) The knife collection identifies targets. It first moves to have as many living creatures in its space as possible within a single Fly action, then attempts dagger Strikes against living creatures in its space.

Reset The spirits in the hazard reactivate after 10 minutes.

Pathfinder Adventure Path: Hell's DestinyORC