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The Rainbow Vomit is a highly coveted gun in Borderlands 4. It’s considered one of the top legendary weapons in the game. When fired, it releases multiple elemental projectiles arranged like a star, causing huge damage on impact. It’s the closest thing to a grenade launcher you can get without using explosive ordnance. If you want to quickly clear enemies or take down bosses in seconds, few other legendary weapons compare. Here’s how to obtain it and a brief explanation of its special effects.
### How to Get the Rainbow Vomit
The Rainbow Vomit drops from Leader Willem, a boss found in Grindstone of the Worthy, located in Carcadia Burn. This boss becomes available after completing a series of side quests for Levaine in the Carcadia hub. You need to finish five specific side quests in this order:
1. Enter the Electi I
2. Enter the Electi II
3. The Council Divided
4. A Traitor Within
5. The Mole’s Gambit
After completing “The Mole’s Gambit,” you can farm Leader Willem anytime by using Moxxi’s Big Encore machine in his arena. The Rainbow Vomit is guaranteed to be in his loot pool. There’s also a very rare chance to find Rainbow Vomit as a world drop.
### Rainbow Vomit Legendary Effect
Rainbow Vomit is a Jakobs shotgun that fires a cluster of three elemental projectiles in an arc with each shot. It’s essentially a grenade launcher that shoots three elements at once. The specific elements depend on the gun’s random roll. Although it launches elemental projectiles, it technically counts as a kinetic weapon.
Getting your character to land critical hits—using skills or gear such as a Jakobs Knife with the Penetrator augment—will dramatically increase damage output. When you scale your damage and elemental effects properly, this gun can easily defeat most bosses in Borderlands 4.