Approach the two-story shack that sits on the river, two houses from the Kuwaq Yaku Base Camp, to witness two men in an argument. Victor gets knocked off the front steps and stands in front of the house. Talk to him to begin the side mission.
Speak with Omar, who sits on the couch inside the shack. He sends you to see Marco, who stands against the far railing at Abby’s cantina. Next, head to the edge of town.
Run past Victor to the “Jardin Comunitario” sign leaning against a porch on the left. Head toward the jungle and crawl under the tree (A). Follow the trail left. Scramble through the short tunnel, slosh through the mud, and climb into the opening to find the pillagers.
Four Trinity soldiers occupy the first area (B). Step into the vegetation wall right of the first enemy and perform a stealth takedown when his buddy leaves his side. Next, move into the vegetation wall behind the man working on the machinery, wait for a third guy to walk in between, and dispose of the seated foe. Immediately scramble into the right bushes and stealth kill the lone soldier by the steps, before finishing off the mobile enemy.
Three more men patrol in and out of the shelters (C) above. You can get to them from the stairs, but a back way gives you better access. Climb the tree on the other side of the ruins and leap over to the big branch, which leads into a concealment bush ahead. Scramble into the storage shelter, grab a bottle, and return to the bush. Toss it against the vegetation wall. When a lone soldier investigates the noise, take him down.
Repeat this process with a second bottle against the inner shelter wall. Kill the second soldier who investigates the noise. Dispose of the final foe with an arrow to the head, or use one of the objects in the area to move him closer.
Pry open a door (D) on the left to find an artifact. Return to the bar and speak to Marco to complete the quest and receive your reward.