Borderlands 4 A Traitor Within Guide: Walkthrough, Rewards & Willem’s Node Puzzle Solution

Borderlands 4 is full of betrayal, chaotic fights, and faction drama—and the Electi storyline is one of the most gripping. After finishing A Council Divide, you’ll unlock the next major Electi mission, A Traitor Within. What starts as a routine supply run quickly spirals into sabotage, Order ambushes, and a final puzzle that tests your precision.

This guide covers how to unlock A Traitor Within, a full walkthrough, and a detailed solution for Willem’s Node puzzle.

How to Unlock A Traitor Within in Borderlands 4

• Faction: Electi
• Quest Giver: Levaine
• Prerequisites:
1. Enter the Electi Part 1
2. Enter the Electi Part 2
3. The Council Divided

Once you’ve completed The Council Divided, speak to Levaine at the Electi base to begin A Traitor Within.

A Traitor Within Walkthrough

Step 1: Collect Thresher Eggs (x4)

• Head to the Ruined Sumplands (west).
• Defeat the Threshers and loot 4 Thresher Eggs.
• Tip: AoE weapons are great here to avoid being overwhelmed.

Step 2: Acquire Pangolin Spit (x3)

• After collecting the eggs, Pangolins spawn in the same location.
• Defeat them and gather 3 Pangolin Spits.
• Completing this step triggers an Order ambush.

Step 3: Defeat Order Troops

• The Order dropship arrives, exposing the betrayal within the Electi ranks.
• Fight off waves of Order soldiers.
• Tip: Use agility-based builds and AoE attacks for crowd control.

Step 4: Deliver the Supplies

• Travel to Moxxi’s Bar in the Ruined Sumplands.
• Drop the ingredients on the counter near the vending machines.

Step 5: Slay the Rippers & Collect the ECHO Log

• Head to the Boneyard (southwest Tonnage Peel, near Quisling’s Cave).
• Eliminate the Rippers in the area.
• Loot the ECHO Log: Bitter Plotter, which reveals details about the traitor.

Step 6: Enter Quisling’s Cave

• Enter the cave and clear out hostile Kratch at the entrance.
• Follow the blue drone markers deeper into the cave.
• Use grapple points to reach higher platforms.

Step 7: Survive the Order Ambush

• Drop into the chamber with black/yellow caution stripes.
• The traitor reveals himself, and an Order ambush begins.
• Expect a tough battle, including a Brute Electi mini-boss.
• Tip: If you see the red skull icon, you may be underleveled—consider leveling up first.

Step 8: Search the Cockpit

• After clearing the area, use the grapple drone (north side) to reach the cockpit.
• Interact with the green-lit console.
• Activate Willem’s holographic interface.

Step 9: Willem’s Node Puzzle Guide

This is the most challenging part of A Traitor Within. Here’s how to solve Willem’s Node Puzzle:

• Node 1: Shoot the single red prism when it overlaps with the blue prisms behind it. Fire as soon as your crosshair turns red.
• Node 2: Stand at the northwest corner (near Levaine). Align the triangles and shoot once they overlap.
• Node 3: Repeat the alignment shot from a slightly different angle in the same area.
• Node 4: Go to the southern crates, climb up for a higher angle, and fire once aligned.

Tips for Willem’s Node Puzzle:

• Use precision weapons (assault rifles, pistols, sniper rifles).
• Avoid SMGs, shotguns, or explosive weapons, as they lack accuracy.

Step 10: Hand Over the Drive to Levaine

• Collect the micro-drive from the console.
• Give it to Levaine to complete the mission.

Borderlands 4: A Traitor Within Rewards

Completing this mission rewards you with:

• XP (scales with your level)
• Cash
• Eridium
• Weapon Reward: Shotgun (Blue/Purple rarity)
• Cosmetic: ECHO 4 Paintjob – “Middle Name: Danger”

Finishing this quest unlocks the next Electi faction story mission: The Mole’s Gambit.

That wraps up our Borderlands 4 A Traitor Within guide. Between the ambushes, betrayals, and Willem’s Node puzzle, this is one of the most memorable Electi quests. Follow the steps above, and you’ll be ready to push forward in the faction storyline.

If you’re stuck on how to do Willem’s Node Puzzle, hopefully this walkthrough gave you the clarity you need.