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From Pathfinder Beginner Box: Secrets of the Unlit Star, which isn't enabled.

Shadow Walls

COMPLEX HAZARD 4
Stealth +10

Disable DC 20 Arcana, DC 20 Nature, DC 20 Occultism, or DC 20 Religion on each of the shadow walls (disabling three of the four walls ends the hazard), or activating the orrery with the unlit star as noted in "The Orrery of Light."

AC 18; Fort +7, Ref +5
Hardness 8, HP 15 (BT 7) Wall HP 15

Melee Shadow Lash +10, Damage 2d6 void

Note: This Strike can only be used with the Single Target result of the Shadow Walls' routine.

Routine

Each turn, the walls use 1 action. Roll a d10 and look up the result on the following list to determine which action the walls uses that round.

1–4 Single Target The walls lash out at a random hero in the room. Roll a d4 and count to the number you rolled, starting with the player on your left, to determine which hero gets attacked. The shadow lash is a ranged Strike with +10 to hit. On a hit, it deals 2d6 void damage (doubled on a critical hit as normal).

5–7 Wall Barrage The shadow arms lunge out from their respective wall, assaulting any one near an active wall. This hits any creature within 10 feet of an active wall (within 10 feet of a shadow hand on the map), dealing 2d6 void damage. Each hero must attempt a DC 15 basic Reflex save, taking no damage on a critical success, half damage on a success, full damage on a failure, and double damage on a critical failure.

8–9 Split Assault The shadows lash out against one half of the room. Roll any die. If the result is even, they assault the western half; otherwise, they assault the eastern half. This deals 2d6 void damage to each creature in that half of the room, and each hero must attempt a DC 15 basic Reflex save.

10 Overwhelming Assault Like the split assault attack, but it targets everyone in the room.

Pathfinder Beginner Box: Secrets of the Unlit StarORC