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Borderlands 4

One Fell Swoop Walkthrough

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☆ How Rush Saved Mercenary Day (Bounty Pack 1)
★ 12 active SHiFT Codes as of December 4, 2025
☆ Black Market Location
★ Elemental Weakness Chart
☆ Legendary Weapons
★ Builds: Vex | Amon | Rafa | Harlowe

Borderlands 4 - One Fell Swoop

This is a walkthrough for the One Fell Swoop mission in Borderlands 4. Follow this guide to sabotage Sol's production facility and learn how to use the Locust sample mechanic.

◀ Previous Mission Next Mission ▶
A Lot to Process Rush the Gate

List of Contents

One Fell Swoop Walkthrough

Objective 1: Sabotage Sol's Production Facility

# Walkthrough
1 Talk to Zadra at her lab.
2
Borderlands 4 - Sol Production Facility
Travel to Sol’s production facility and eliminate all enemies at the entrance.
3
Borderlands 4 - Bulkheads Behind Door
Further along the entrance, there will be a large door tinted with green. Be careful once you approach the door as it will open and two Bulkheads will immediately attack you.
4 After killing the Bulkheads, enter the facility lobby and clear the succeeding areas filled with enemies.
5
Borderlands 4 - Hack Bio-Bulkhead
As you progress further into the facility, you will see a Bio-Bulkhead contained in a chamber. Access the terminal in front of the glass to hack it.
6
Borderlands 4 - Shoot Synth Processor Core
Advance to the next room and eliminate all enemies there. Go to the synth processor at the center and open it. Then, with your weapon pointed between the gap, shoot the core to destroy it.
7 Meet Zadra back at the lobby to take the elevator to stop the airship.

Objective 2: Stop Sol's Airship

# Walkthrough
1
Borderlands 4 - Armored Door
Clear the area with Zadra. Afterwards, Zadra will ask you to try shooting a door, which will have no effect. To look for another entry point, look up and take the vent. Inside, take a right and drop down. Break the vent open and drop into the lab.
2
Borderlands 4 - Locust Sample Dispenser
Clear the lab and approach the Locust dispenser to get an explosive sample. Throw the sample at the nearby armored door to blow it up.
3 Return to Zadra and destroy another armored door to reach the airship.
4
Borderlands 4 - Bio-Bulkhead
Slide down to reach the boss arena of the Bio-Bulkhead. With the Locust dispensers in the area, use the samples to briefly disable its armored skin.
5 After beating the boss, go to the airship. Once you arrive there, however, it will be too late. Teleport back to The Howl to return to Outbounders HQ.

Objective 3: Stop Sol's Locust Attack

# Walkthrough
1 At Outbounders HQ, find and help Rush but be careful of being hit by Corrosion.
2
Borderlands 4 - Remove Debris from Fast Travel Station
After bringing Rush to safety, go to the HQ bunker to reactivate the fast travel station. Remove the debris by using the grappling hook. Zadra will arrive after the station is activated.
3
Borderlands 4 - Sol Airship Tractor Beam
Leave the bunker and find a way to enter the airship. In a short while, the airship will emit a tractor beam. Stand in it to float into the ship.
4 Inside, locate the terminal to eject thermal capacitors. It is not necessary to kill all enemies here. Then, destroy three of the critical systems around the ship to bring it down.
5 After destroying all three, immediately jump down the hole you came from to escape. You only have 27 seconds to leave.

One Fell Swoop Rewards

Main Mission Rewards
Base Reward • Cash
• XP
• Eridium
Equipment Reward • Sniper (Blue or Purple Rarity)
Cosmetic Reward • Devourer (Weapon Skin)

Borderlands 4 Related Guides

Borderlands 4 List of Main Missions Partial

List of All Main Missions

All Main Missions

# Main Mission
1 Guns Blazing
2 Recruitment Drive
3 Down and Outbound
4 A Lot to Process
* One Fell Swoop Shadow of the Mountain Wrath of the Ripper Queen
Rush the Gate Crystal Brawl Siege and Destroy
↓ Dark Subject Unpaid Tab
His Vile Sanctum Her Flaming Vision
15 Rising Action
16 Another Day, Another Universe
17 The Falling Wall
18 Means of Ascent
19 Plan Z
20 The Timekeeper's Order
21 Secrets of the Vault

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