Blood of Oros
After exiting the cave, head on over back to Wogah's dwelling. You will find him with a surprised look.
He will then request some Blood of Oros which looks like obsidian. The mission will start and you will have to go to a nearby camp. This camp has two Udam guarding it.
After disposing the Udam, burn on the vines blocking the stones around the camp. "Investigate" or look into them to find a big sparkle. Hinting the location of the Blood of Oros, which is rather Far away.
Heading to the location you will find a some Udam mining the stones. Eliminate them all to mine in peace.
When the coast is clear, go ahead and mine all the Blood of Oros you need.
Mining all the required Blood of Oros will automatically complete the mission and add Wogah to your tribe.