The players encounter a simple locked wooden door with a knocker on it. Using the knocker triggers a large wooden log to burst through the door and deals 1d6 damage for each time the player knocked on the door. DC 16 Dex save to take half damage and be pushed back 10 ft. Unlocking the door results in the door being audibly locked again from the inside. If a player attacks the door, they trigger the trap at 2d6 damage.