How To Get The Rainbow Vomit in Borderlands 4

By Ambar Jimenez | 2025-09-21 10:57:47
In the chaotic universe of Borderlands 4, legendary weapons are the ultimate prize for any Vault Hunter. They are not merely guns with better stats, but rather game-changing tools with unique, often absurd effects. Among the most coveted of these is the Rainbow Vomit, a shotgun that turns the battlefield into a kaleidoscope of destruction.The Rainbow Vomit is a Jakobs legendary shotgun, but it defies the manufacturer's typical "high-damage, no-elemental" identity. With each pull of the trigger, it launches a volley of three elemental projectiles in a star-shaped pattern. These projectiles fall in an arc, creating massive splash damage that is perfect for clearing out mobs of enemies or melting a boss's health bar in seconds.

Borderlands 4: How To Get The Rainbow Vomit

The Rainbow Vomit is a dedicated drop from a specific boss, meaning you can reliably farm it once you know where to look. The boss you're hunting is Leader Willem, who is found in Grindstone of the Worthy, Carcadia Burn.However, you can't just walk up to his arena and fight him. Leader Willem is locked behind a lengthy side quest chain that you'll need to complete first. The side missions are given to you by Levaine in the Carcadia hub and must be completed in this specific order:
  • Enter the Electi I
  • Enter the Electi II
  • The Council Divided
  • A Traitor Within
  • The Mole's Gambit
Once you have successfully completed "The Mole's Gambit" and defeated Leader Willem for the first time, you will gain access to Moxxi's Big Encore machine in his arena. This machine allows you to respawn the boss and farm him as many times as you like, which is the best way to get the Rainbow Vomit with your preferred elemental rolls.In addition to being a dedicated drop, the Rainbow Vomit can also be a world drop, meaning it can theoretically drop from any enemy or chest in the game. However, this is an extremely rare occurrence, and farming Leader Willem is a far more efficient method. It's also worth noting that it can sometimes be a featured legendary reward in Wildcard Missions, which are replayable challenges that can be accessed from your map after you've completed the main story campaign.

Rainbow Vomit Legendary Effect

What makes the Rainbow Vomit so special is its "Color Spray"intrinsic affix. The weapon's projectiles are randomly assigned threedifferent elements upon dropping, such as Corrosive, Cryo, andRadiation. This makes it incredibly versatile, as it can deal withmultiple enemy types without needing to switch weapons. The projectilesare technically categorized as "kinetic," but they deal elemental damage on a splash-damage basis.

As a Jakobs weapon, the Rainbow Vomitbenefits greatly from critical hits. Jakobs weapons are known for theirability to ricochet bullets and deal massive damage on critical hits,and the Rainbow Vomit is no exception. By stacking skills or gear thatincrease your critical hit chance, you can turn this shotgun into a true boss-shredding machine. A Jakobs Knife with the "Penetrator" augment is an especially powerful pairing, as it ensures you get critical hits onevery shot.

Ultimately, the Rainbow Vomit is a top-tier legendaryweapon that is well worth the effort to obtain. Its uniqueelemental-and-ricochet combination makes it a formidable choice for anybuild, allowing you to dominate both hordes of enemies and the game'smost challenging bosses with a shower of colorful destruction.

Platform(s): PlayStation 5 PS5, Microsoft Windows PC, Nintendo Switch 2, Xbox Series X/S
Genre(s): First-person shooter, action role-playing
Developer(s): Gearbox Software
Publisher(s): 2K
Engine: Unreal Engine 5
Release date: September 12, 2025
Mode: Single-player, multiplayer
Video preview



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