After lighting the first 6 braziers, as shown on the separate brazier challenge page, jump from the ledge at the bottom of the stairs to the nearest square platform. Two archers appear on the columns ahead. Shoot them before they can shoot you.
Jump over to the larger platform with the snowmaking machine. Move around the upper left side to avoid being hit by the icy blast. Kill another archer who materializes on the column ahead.
Then retrieve the red skull (1/5) sitting on the column to the right.
Jump back onto the large, square platform, then the next platform to the upper right, taking care to avoid the snow jets if possible. Then jump onto the pedestal with the square pressure pad in order to open the gate just to the left.
Jump across the gap and return to the top of the stairs.
Pull the golden handle to open the gate on the upper right side of the room.
The gate you opened with the pressure pad stays open permanently, but the other closes once the handle retracts. So run/roll down the stairs...
...jump over to the pedestal with the pressure pad, then to the platform on the left with the snowmaking machine.
Move counterclockwise around the platform to avoid the snow jets and then jump onto the ledge below the gate.
In the single-player game, grapple the golden ring above and climb onto the ledge.
In co-op, there is no ring, so use the bubble shield and grapple to get everyone up onto the ledge. Once one character steps on the pressure pad there, the gate stays open.
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