THE HIDDEN CITY - FIND THE SILVER BOX OF IX CHEL
Go forward and leap to the craggy wall, grabbing on with the Grapple Axe, then lower yourself down into the chamber below. You can look around to find some cloth and salvage, as well as inspect the mural on the right.
A wooden barrier blocks the way, so find the rope-wrapped lever in the left corner and pull it using your rope-arrows to release the oil. Then push the switch in the middle of the room to release the fire. This burns the barrier down, so head through the tunnel.
Jump to the next craggy wall and rappel down into the next room – the bloodletting chamber. The switch for the fire is on the left, and the rope-wrapped lever is on the right. At the bottom of the room are two pillars situated in the middle of a maze of channels that the oil needs to pass through. Just as before, you need to burn down the barrier to the exit.
Follow these steps:
Stand next to the pillar on the right and tether a rope from here to the top of the left pillar.
Now grab hold of the arm on the left pillar and rotate it anti-clockwise 180 degrees. Then cut the rope.
Rotate the left pillar anti-clockwise again 90 degrees.
Return to the top of the steps and rope-pull the lever to release the oil.
Press the switch to release the fire and watch as it travels to the bottom of the room and burns down the barrier.
Now simply make your way into the next chamber to finish this section.