The Borderlands 4 One Fell Swoop Main Mission is the fifth story quest you’ll encounter, provided you choose to take on Idolator Sol first. This mission is a major step forward in the campaign, where you’ll sabotage Sol’s facility, face his Locust Bio-Weapon, and ultimately bring down an airship.
In this complete guide, we’ll walk you through each stage of the mission, highlight the key challenges, and give you useful strategies to complete it efficiently.
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How to Start One Fell Swoop
To kick things off, you’ll need to talk to Zadra at The Stubs. If you’ve just finished the “A Lot To Process” mission, you’ll already be in her lab, making it an easy transition.
Step-by-Step Walkthrough
1. Reach and Sabotage Sol’s Production Facility
Follow the map marker to Synthetic Nave. Once inside, destroy machinery and disrupt operations to weaken Sol’s bio-weapon production line.
2. Open and Damage the Synth Processor
Progress deeper into the facility until you find the Synth Processor. Target its exposed core to deal critical damage and shut it down.
3. Meet Zadra for New Objectives
Head back to Zadra for your next instructions. She’ll point you toward the Main Network Terminal.
4. Clear Guards and Find the Terminal
This section involves straightforward combat—eliminate guards and secure the terminal.
5. Bypass the Armored Door
The direct route is blocked, so use your Grapple to squeeze through a side passage. This leads to a control room where you’ll continue the mission.
6. Dispense the Locust Sample
Inside, dispense the Locust Sample to trigger the next sequence. Return to Zadra, who warns you that Sol’s weaponized airship is about to launch.
7. Defeat Bio-Bulkhead (Boss Fight)
On your way to the airship, you’ll face Bio-Bulkhead, a heavily armored boss. Use Locust Canisters to strip its armor and remove immunity before dealing damage. Once down, proceed toward the airship.
8. Chase the Airship & Find Fast-Travel Point
Despite your efforts, you’ll miss the airship. Follow the marker to a Fast-Travel Point, clearing debris along the way to activate it.
9. Enter the Airship and Sabotage It
Once aboard, eject Thermal Capacitors and destroy key ship components to cripple the vessel and halt Sol’s Locust attack.
10. Abandon Ship Before Explosion
With the airship collapsing, a countdown timer appears. Jump off and escape before the massive explosion finishes the job.
Mission Complete!
Tips for Success
- Ammo Management: Stock up before heading into the facility.
- Use Locust Canisters: They’re critical for defeating Bio-Bulkhead.
- Watch the Timer: Don’t linger on the airship too long during the final escape sequence.
Stay stocked, stay sharp, and you’ll breeze through this mission.
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