Big fancy new area! With wolves! Look for a Buddha with a shrine thing in front of it. Light it on fire for XP. Look for nine more throughout this level for even more.
Climb on a rooftop to reach a swinging crate. On the other side, look for a relic. Head up for another swinging crate, then head out to find a way across to a ruined plane.
On the plane, keep ascending, and you’ll walk back on top of the fuselage. Jump across to keep heading up. Then head into the cave. At the end of the cave is a transmitter you need. On the way back out, expect a close encounter.
Deliver the transmitter for a new tool, a climbing axe that will help you reach new areas. Follow the directions and when you are told to look for a secret tomb, look for some white illustrations on a rock. Walk up to it, past it off the edge, and down into the hidden area under the waterfall. There’s a GPS marker at the entrance. It’s the Tomb of the Unworthy.
The Tomb is pretty easy. Jump across the hanging thing with the bundles on it, and then off the other side to light your torch. Then torch the bundles, then knock the “cage” off the edge, and use your axe to ascend. Tada!
Head back out the tunnel, and look for a rock wall you can climb up by the cave you visited earlier. Reach the top to encounter some enemies. You can draw down on them fast, or try to take them sneaky. They’ll set of a flare if you don’t put them down quickly enough.
After that, look for loot, and keep climbing with the axe all the way to the top. Then you have to find a technical doodad to send out an SOS signal. Almost immediately you’ll be spotted, and there’s no subtlety needed. Feel free to get your gun out. After that just keep going until you reach the next fire.