Below is a walkthrough on the Level 7 The Bristlebacks side quest in Horizon Forbidden West. To obtain this quest, speak with Javad the Willing at Chainscrape.
Talk to the Carja Magistrate
Travel to the tavern and speak with the Carja Magistrate who is sitting at a table.
Search West of the Quarry for Bristlebacks
Head southwest of Chainscrape. When you reach the campfire, head west to find some dead Bristlebacks next to a waterfall
Examine the Bristleback Carcass
Inspect the carcass of the machine.
Follow the Trail to the Back of the Valley
Continue along the path, passing more carcasses, until you reach the Split Crag mine.
Enter the Mine
Head into the Split Crag.
Investigate the Mine
Follow the path deeper into the mine until you reach an open cavern.
Kill the machines
Defeat the machines.
Investigate the Smoking Tunnel
Head up the walkway up the destroyed track then enter a tunnel. Turn to the left and drop down to the barrels below to find a note. Examine it.
Return to Javad the Willing
Head back to Chainscrape and speak with Javad the Willing in the tavern.
*After completing the above objective, the quest will be put on hold until The Embassy main quest has been completed.*
Kill the Rebels and their Machines
Clear the rebel camp north of the Salvage Contractor.
Investigate the Cave
Head into the back of the camp and lower the drawbridge. Afterwards, head to the right of the drawbridge wheel and follow the path to the end. There will be a wall you can climb across to reach the other side. Lower the drawbridge here then head deeper into the cave to trigger a cutscene. Before leaving, search the cave for a Greenshard Sliver and valuable cache.
Return to Javad the Willing
Head back to Chainscrape and speak with Javad the Willing in the tavern to complete the quest.
Rewards
- 2330 XP
- 2 Skill Points