Mountain Village - House Below the Village Overlook Camp

When you're done talking with Roth and upgrading Lara's skills and gear, head down the rocky path to the end, where you'll find a post for anchoring a rope arrow. Shoot one into the archway below and slide down to the upper level of the village—an area that you weren't able to explore last time you were here.

Stay hidden behind the low plank wall next to the house for now, though, since there are 3 enemies with rifles milling around in front. After a little conversation, one walks away up the steps ahead. You can shoot him if you like, but this will probably attract the attention of the others. You can also just let him go.

Then it's not too hard to take the others out with headshots once they separate and face in different directions.

Loot the bodies and smash the salvage crate near the low wooden wall where you hid. This crate contains a BOW PART (2/2) which, along with the other part, will enable you to upgrade your bow next time you reach a base camp.

NOTE: Some of the weapon part locations are random. So if you don't get the BOW PART here, you should find it soon. Just keep opening those salvage crates. If you missed the first bow part in the Base Exterior area, you can still go back for it. Next time you get to a Fast Travel camp, use it to return to that level. Check the walkthrough if you need help finding the bow part. Then Fast Travel back to the camp where you left off.

Search inside the building to find another salvage crate and a relic (3/6), a Medicinal Herb Vial, part of the Kanpo Herbs set. Be sure to examine it closely for more info and XP. On one side of the room is an alcove boarded up with planks and barbed wire. There's a document back there, but you'll need to find a new weapon to blow up those planks before you can get it.