Borderlands 4 Guide | How to Farm Leader Willem and All Legendary Drops

When pursuing the most powerful legendary equipment in Borderlands 4, facing Leader Willem becomes absolutely essential. This formidable enemy yields three exclusive high-tier weapons – the Zipper pistol, Firepot grenade modification, and Rainbow Vomit shotgun – each featuring distinct combat mechanics and exceptional farming potential. Our comprehensive guide delivers detailed strategies for locating this boss, activating the encounter, and efficiently obtaining his premium gear.

Leader Willem makes his home deep below Carcadia Hub, specifically within the Grindstone of the Worthy area, which you can reach via The Excrucible access point.

To initiate this confrontation, you must finish the complete “Enter the Electi” mission chain obtained from NPC Levaine stationed in Carcadia. The concluding mission, titled “The Mole’s Gambit,” activates the boss battle sequence.

Once you’ve defeated him initially, you gain the ability to repeatedly challenge Leader Willem through Moxxi’s Big Encore Machine, establishing this as one of Borderlands’ most dependable legendary farming paths available to players.

Pro Tip: Before attempting the boss fight, ensure your character is at least level 35 and has completed the main story up to Carcadia to avoid being underleveled for the encounter.

Leader Willem’s combat sequence incorporates two distinct defensive stages – Shield Protection and Armor Hardening – requiring you to alternate damage types during the engagement:

● Shield Phase: Employ Shock-element firearms to rapidly eliminate his energy shield.

● Armor Phase: Transition to Corrosive damage weapons for optimal armor destruction.

● Survival Technique: Maintain constant movement, evade incoming projectiles, and intentionally preserve one or two minor enemies to enable Second Wind activation.

● Difficulty Setting: Farm this opponent on Easy Mode configuration – exclusive drop percentages remain unchanged regardless of difficulty selection.

Advanced Tactics: Consider bringing weapons with multiple elemental types or a Maliwan weapon that can switch between Shock and Corrosive damage on the fly. The battle arena features several cover points – use them strategically during his most aggressive attack patterns.

Leader Willem relinquishes three exclusive legendary items upon defeat:

● Zipper — Pistol

● Firepot — Grenade Mod

● Rainbow Vomit — Shotgun

Typically, acquiring all three weapons requires approximately 30-40 successful eliminations. However, individual drop probabilities fluctuate significantly across different player experiences. Below you’ll discover an exhaustive evaluation of each firearm’s capabilities.

Zipper (Pistol)

Manufacturer: Datalless

Flavor Text: “Prison rules.”

Effect: +75% Critical Hit Damage and +75% Additional Damage when striking adversaries from behind.

Base Statistics:

DPS 3,240

Base Damage 835

Fire Rate 6.2 shots / s

Reload Time 1.5 s

Magazine Size 16

Despite the impressive statistical description, this firearm underperforms in elevated difficulty scenarios or boss confrontations. The weapon depends critically on precise rear assaults – a tactical approach difficult to execute against boss enemies. Unless you acquire an extraordinarily well-rolled specimen, it doesn’t justify dedicated farming efforts.

Firepot (Grenade Mod)

Type: Grenade Mod

Description: Generates automatically-targeting adhesive explosives that inflict Fire damage.

Base Statistics:

Damage 6,850

Cooldown 11 s

Explosion Radius 520

Charges 2

Flavor Text: “Spicy spawns homing Torgue stickies over time.”

Mechanical Behavior:

● Adhesive explosives cling to opponents or environmental surfaces and detonate autonomously.

● You can switch firearms to initiate immediate detonation for concentrated damage output.

● The Atomic / Nuke modification substantially amplifies blast dimensions and destructive force, perfect for area clearance or rapid boss elimination.

Universally regarded as the superior acquisition from Leader Willem, the Firepot functions effectively for every character class and shines in both crowd control and boss engagements. It represents one of Borderlands 4’s most adaptable grenade modifications – making it your highest-priority farming objective.

Rainbow Vomit (Shotgun)

Type: Torgue Shotgun

Flavor Text: “Color Spray.”

Effect: Discharges three randomly-selected elemental projectiles (including Corrosive, Shock, Cryo, Fire, or Radiation elements).

Base Statistics:

DPS 5,154

Base Damage 823 × 6

Reload Time 1.7 s

Fire Rate 1.5 shots / s

Magazine Size 6

The Spread Launcher configuration produces enormous burst damage potential, particularly when utilizing the Incendiary + Shock + Corrosive elemental mixture that performs excellently against all enemy varieties. Although its effectiveness diminishes at extended distances, it maintains devastating performance in close-quarters combat – simply anticipate an extended farming duration since its drop frequency is considerably reduced compared to the other two items.

Drop Rate Insights: Based on community data, expect the Firepot to drop most frequently (approximately 15% chance), followed by Zipper (10%), with Rainbow Vomit having the lowest drop probability at around 5% per kill.

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No reproduction without permission：OnLineGames Guides » Borderlands 4 Guide | How to Farm Leader Willem and All Legendary Drops Complete guide to finding, battling, and farming Leader Willem's exclusive legendary drops in Borderlands 4