Borderlands 4: A Lot to Process Walkthrough [Step-by-step Guide]

What to know

• A Lot to Process is an early main mission that sends you into the meat-processing plant called the Killing Floors.
• Expect platforming (shower and grinder), waves of enemies, and a mid-run setpiece with an elevator/pipe sequence.
• The mission boss is The Oppressor, a heavy-hitting foe that requires mobility and strong elemental damage to take down.
• Rewards include XP, Eridium, cash, rare equipment, and a chance at multiple legendary items from The Oppressor.

BL 4 Missions Overview

A Lot to Process Overview

A Lot to Process takes you from Zadra’s home deep into the Killing Floors, a brutal meat-processing facility full of hazards and ambushes. This walkthrough breaks the mission into five phases (A–E), with a clear step-by-step path and loot expectations.

Phases at a glance

Phase A: From Outbounders HQ to Zadra’s home

Step 1

Begin at Outbounders HQ. Speak to the mission-giver and follow the marker to leave the base.

Step 2

Travel across the canyon route, fighting small groups of Order soldiers. A barrier persists as you reach the Order Scientist's Home.

Step 3

Locate the coordinates pointing toward Zadra’s home. Approach carefully — the location is under surveillance. Find the generator behind the home and shoot it to open the barrier. You will gain access to the home.

Step 4

Inspect the ruined house

Step 4

Find Scientist Zadra and uncover traces that Zadra has been taken elsewhere.

Step 5

Kill Order reinforcements. Task updates to "Reach the meat processing factory." You will unlock Pester's Grotto crawler and reach Dissected Plateau from Idolator's Noose.

Phase B: Entering the meat processing factory

Step 1

For the task of finding the meat processing factory, "Find where the wildhorns go", lead to the plant entrance and follow the marker to the wildhorn enclosure.

Step 2

Override the control room systems to activate the shower valves.

Step 3

Pull the ceiling lever to release the meat. Stand beneath it to be covered in wildhorn blood. This disguises you to pass the factory scanners.

Step 4

Move through the side entrance and down into the factory interior.

Phase C: Finding and rescuing Zadra

Step 1

Navigate through the vents by climbing the wall panels.

Step 2

Drop into the holding chamber where Zadra is kept. Speak to her to trigger the rescue sequence.

Step 3

Fight through waves of Order soldiers (Pinhead and Watchmen's) while Zadra works on opening doors. Escort her carefully through the corridors.

Step 4

Kill the guards. Find the elevator and escape with Zadra to the roof.

Phase D: Collecting and installing teleporter parts

Step 1

Clear enemies on the rooftop area. Engines and Synths drop control circuits, while Pinheads drop transponder packs.

Step 2

Collect three control circuits and one transponder pack.

Step 3

Install the parts into the teleporter so Zadra can proceed.

Phase E: Facing the Oppressor

The Oppressor, a flying gunship, attacks with shields and missiles. Use elemental counters (Shock for shields, Corrosive for health). Destroy incoming missiles and focus fire on weak points.

Once defeated, loot the arena and proceed with Zadra.

Phase F: Reaching Zadra’s lab

Step 1

Follow the coordinates given after the fight to find Zadra's Lab in the Stubs beginning at the Idolator's Noose.

Step 2

Clear out wildlife blocking the path, including Threshers.

Step 3

Enter the cave behind the waterfall. Speak with Zadra in her lab to complete the mission.

A Lot to Process mission rewards

A Lot to Process mission legendary drops from the Oppressor

Closing notes on A Lot to Process mission

The mission blends exploration, disguise mechanics, rescue sequences, and a climactic boss encounter. From Outbounders HQ to Zadra’s hidden lab, you’ll fight through dense factory combat and face the Oppressor for chances at some of the game’s stronger legendaries. Completing it unlocks the next major chapter in the storyline.