Boom or Bust is a Side Quest in Horizon Forbidden West (HZFW). This walkthrough will guide you through all objectives of the Boom or Bust side mission.
Location: Hidden Ember
Quest Giver: Delah
Quest Level: Level 24
Requirement: Finished Main Quest 11: The Sea of Sands, Errand: A Bigger Boom, Side Quest: Breaking Even
Reward: 7800 XP, +3 Skill Points
Mission Info: Delah will risk everything to find her sister Boomer, who left camp after the two had a bitter argument
Objectives:
- Go to Boomer’s Last Known Location
- Search for Boomer’s Tracks
- Follow the Tracks
- Kill the Machines
- Investigate the Ruins
- Examine the camp
- Search for Boomer’s Tracks
- Follow the Tracks
- Climb up to the Wreck
- Investigate the Wreck
- Examine the Device
- Go to the Wreck
- Examine the Tools
- Kill the Machines
- Talk to Delah and Boomer
- Follow Boomer
- Kill the Shellsnapper
- Talk to Delah and Boomer
Starting Location: Boom or Bust
This quest only spawns at Hidden Ember after finishing Main Quest 11: The Sea of Sands, Errand: A Bigger Boom, Side Quest: Breaking Even.
Go to Boomer’s Last Known Location
Talk to quest giver Delah and pick dialogue “Boomer’s last known location” to start the first objective.
Head east, the target location will be marked on your map:
Search for Boomer’s Tracks
Press 
to activate your scanner and look at the purple silhouette of a person in the sand.
Follow the Tracks
While scanning the area you can press 
to highlight the tracks. Then you can stop scanning the area and run after the purple tracks in the sand. This is where you will end up, at some ruins with machines:
Kill the Machines
Where you arrived, kill all the machines in desert ruins, consisting of 2 Clawstriders and 3 Scrappers.
Investigate the Ruins
Go up in the ruins but be careful of the explosive traps along the way (they look like balloons on the ground).
Examine the camp
Press 
to examine the camp (standing near to the box with blue icon). This will result in a cutscene where you find a hammer.
Search for Boomer’s Tracks
Stay where you are and press to scan for the purple silhouette. Press to highlight the tracks.
Follow the Tracks
Again follow the tracks. This is where you end up:
Climb up to the Wreck
Where the tracks end you must climb up the mountain wall to the top. As usual you can tap to highlight the climbable ledges in yellow. There will be a grappling point halfway up where you can double-tap 
to pull yourself up.
Investigate the Wreck / Examine the Device
At the top you find a plane wreck. Inside, in the middle of it, is a device you must examine with .
Go to the Wreck
Another wreck awaits. But this time it’s just some broken machine parts and not a plane. It’s 100 meters to the south of the last objective.
Examine the Tools
Press to examine the tools while standing next to Delah. Get ready for a machine fight.
Kill the Machines
You will be ambushed by 2 Longlegs and 1 Frost Bellowback. Defeat them.
Talk to Delah and Boomer
Talk to Delah and Boomer after the fight.
Follow Boomer
Follow both of them down the path. At one point they will jump down some cliffs to an area with explosive barrels. Then boomer shoots a barrel to anger a Shellsnapper. This is where you end up:
Kill the Shellsnapper
Shellsnapper is a giant turtle machine. This is one of the harder enemies in the game. Scan it with and focus on the weak spots on its back until it’s defeated. You can also detach its weapons and use them against it. Get ready to dodge a lot, it likes to spew ice at you from afar. It also likes to dig into the ground and then quickly reappears from below.
Talk to Delah and Boomer
One last time, talk to Delah and Boomer to complete the quest.
This finishes Boom or Bust Side Quest in Horizon 2: Forbidden West.
For all other Side Quests and Main Quests, check out the complete Horizon Forbidden West Walkthrough.
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