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Borderlands 4

Leader Willem Drops and Location

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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
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Leader Willem

Leader Willem is a boss that drops the Rainbow Vomit Legendary Shotgun, found at The Excrucible in Borderlands 4. See Leader Willem's drop rewards, location, and tips on how to beat Leader Willem in this guide.

List of Contents

Leader Willem Drops

Leader Willem Drop Rewards
Zipper (Legendary Pistol)
Rainbow Vomit Rainbow Vomit (Legendary Shotgun)
Firepot Firepot (Legendary Grenade)

Leader Willem Location

Found in The Excrucible

Found in The Excrucible

Leader Willem is located in The Excrucible, Grindstone of the Worthy in Carcadia Burn. Leader Willem appears as a boss encounter in the side mission, The Mole's Gambit. Keep in mind that you must first complete the A Traitor Within side mission before The Mole's Gambit becomes available.

Leader Willem can also be repeatedly farmed after you complete The Mole's Gambit. Return to the location after the side mission and spend cash at the Moxxi's Big Encore Machine near the entrance of the boss arena to re-farm it.

Borderlands 4 Interactive Map

How to Beat Leader Willem

How to Beat Leader Willem
Check icon Use Shock and Corrosive Weapons
Check icon Strafe and Dash Against Projectiles
Check icon Save Enemies for Second Wind

Use Shock and Corrosive Weapons

Leader Willem has two health bars. Start with Shock weapons to break his shield, then switch to Corrosive to quickly chew through his armor.

Elemental Weakness Guide

Strafe and Dash Against Projectiles

Leader Willem unleashes volleys of projectiles that deal heavy damage. Keep strafing and dash sideways to stay out of harm's way.

Save Enemies for Second Wind

Avoid clearing every enemies in the arena. Leave a few alive so you can secure a Second Wind if you get downed.

Leader Willem Overview

Leader Willem
Mission The Mole’s Gambit
Point of Interest The Excrucible
Area Grindstone of the Worthy
Region Carcadia Burn
Weakness Shock, Corrosive

Borderlands 4 Related Guides

Borderlands 4 List of All Bosses Partial

List of Bosses

List of Bosses

Invincible Bosses
Bloomreaper - -
The Fadefields
Warden Scathe Splashzone Horace
The Oppressor Bio-Bulkhead Idolator Sol
Primordial Guardian Inceptus Sidney Pointylegs Sludgemaw
Voraxis Foundry Freaks Backhive
Mimicron Core Observer Minister Screw and Donk
Carcadia Burn
Moon-Maddened Callis Callis, the Ripper Queen Genone
Pango and Bango Driller Hole Rocken Roller
Skull Orchid Primordial Guardian Radix Fractis
Leader Willem Rippa Roadbirds -
Terminus Range
Saddleback and Immortal Boneface Shadowpelt Callous Harbinger of Annihilating Death
Bramblesong Primordial Guardian Origo Vile Protoype
Vile Lictor Skyspanner Kratch Divisioner
Dominion
Axemaul Timekeeper Primordial Guardian Timekeeper
Arjay Bio-Thresher Omega Directive-0
Vile Ted - -

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