In Chapter 2.3 of Hunted: The Demon’s Forge, you start out in a cavern. Have E’lara stay on the nearby platform, and have Caddoc uses the crank.
This will bring E’lara to the bottom. Then, you want E’lara to shoot the explosives, allowing Caddoc to cross. Continue your way along the path and keep an eye on the right, where there will be a small chamber containing a corpse and the thirteenth Death Stone you will come across. Collect it. Continue down the path, avoid the lava, and eliminate the nearby enemies. Go down the path to the right when you come across it to find a chest of gold that you should collect.
From here, you have completed Chapter 2.3 of Hunted: The Demon’s Forge.