Strong like Rock (Urki the Thinker) | Walkthrough Far Cry Primal Guide

Locate the two enemies that have horns and in case of detection can call for help.

Go towards the camp pointed by Urki. The camp isn't well guarded. In first order you should eliminate the two enemies with horns standing on the roof. This will stop the enemies from calling help.

By lurking from behind the rock you can methodically kill most of the enemies.

You will find a great observation point behind the large rock. You will be able to see the whole camp and enemies won't detect you too early. By using bow you can quietly kill almost all enemies. Leave the heavy armored one for the end. Once you're done with enemy tribe, search the village. Your target are three rocks which you will find by using hunter vision (two are next to the huts, both on the right and left side. The third one can be found on a small island).

Test Urki's "armor".

Deliver what you found to Urki and then throw a spear at him.