If you’ve spent any time farming legendary drops in Borderlands 4’s first few open zones, you’ve probably heard other Vault Hunters rave about the borderlands 4 kaoson. This Dahl-manufactured SMG has quickly become a fan favorite for its absurd fire rate, unique chaos-themed perk, and versatility across almost every playstyle. Even if you prefer long-range sniping or heavy explosive builds, you’ll want to keep one of these in your inventory for tight corridor fights or swarms of common enemies. I’ve farmed close to 12 variants of this weapon over the past two months, so I’ve got all the details you need to get the best roll possible and make the most of it.
What Makes the Borderlands 4 Kaoson Stand Out From Other SMGs
Most Dahl SMGs in Borderlands 4 lean into balanced, reliable performance, but the Kaoson cranks that up to 11 with a custom perk no other weapon in the game has. Every 10th shot you fire spawns a small chaos orb that bounces off walls, floors, and enemies before exploding for elemental damage that matches the weapon’s roll. These orbs don’t cost any extra ammo, and they can hit multiple targets in a single bounce, making the gun way more effective for crowd control than its small frame suggests.
It also comes with built-in perks that fix common pain points of using fast-firing SMGs. You get a 100% accuracy bonus when aiming down sights even while moving, so you won’t waste half your magazine missing shots at mid-range. Its elemental proc chance is 20% higher than base Dahl SMGs, so you’ll apply status effects like shock or corrosive far faster than you would with similar weapons. The only real downside is its small 24-round base magazine, which means you’ll be reloading fairly often if you don’t run ammo regeneration perks.
How to Farm the Kaoson Reliably in Borderlands 4
The good news is the Kaoson isn’t a random world drop, so you don’t have to grind hundreds of generic enemies to find one. It only drops from three specific sources, so you can target farm it whenever you have 10 or 15 minutes to spare. I’ve tested all three methods dozens of times, and these are the most efficient ways to get your hands on the gun:
- Defeat the Chaos Warden mini-boss in the Flooded Bunker zone: this has a 12% drop chance on Mayhem 10, the highest of any source, and you can reset the fight in 90 seconds by fast traveling to the nearest checkpoint.
- Open Chaos Chest rewards after completing Proving Grounds runs: each clear gives you two chaos chests, each with a 4% drop chance for the Kaoson, and you’ll get extra legendary gear as a bonus for completing challenges during the run.
- Trade with other players via the in-game social hub: if you have extra rare cosmetics or high-roll legendary snipers you don’t use, you can easily trade for a perfect Kaoson without any farming at all.
I’ve had the most luck farming the Chaos Warden on Mayhem 8 instead of 10, honestly. The drop rate only drops 2% to 10%, but the boss is 40% less tanky, so I can run 3 clears in the time it takes me to do 2 on Mayhem 10. Just make sure you have a loot luck booster active before you start farming, it’ll bump up your chance of getting a +3 perk roll by almost 30%. You don’t have to worry about wasting time on random world drops, since the Kaoson only drops from the three sources listed, so you can target farm the borderlands 4 kaoson whenever you have 15 minutes to spare.
Best Perk Rolls to Look For on Your Kaoson
Not all Kaoson drops are created equal, and some perk combinations will make the gun feel infinitely more powerful than others. You don’t need a perfect roll to make it usable, but if you want a variant that will carry you through endgame Mayhem 10 content, these are the perks to prioritize:
The top general use perk is 50% extra elemental damage on chaos orb explosions, since it boosts the gun’s unique signature ability by half. If you run status effect or melee builds, look for a +25% damage to bleeding enemies roll, which stacks with most status buffs to melt even tanky bosses in seconds. If you hate the gun’s small base magazine, a 100% magazine size bonus roll will fix that flaw entirely, giving you 48 rounds per mag without any extra build investment.
For elemental rolls, stick to corrosive or shock variants for most content. Corrosive melts armored enemies that are common in late-game industrial zones, and shock tears through shielded enemies you’ll face in Proving Grounds and raid encounters. Fire rolls are only useful for the flesh-heavy Ash Plains zone, so you can skip those unless you specifically need a weapon for that area. Remember you can re-roll up to two perks per Kaoson at the Sanctuary upgrade station, so even a near-perfect drop with one bad perk can be fixed for a small amount of Eridium.
Optimal Builds to Pair With the Kaoson
The Kaoson works great with almost every Vault Hunter build, but a few specific loadouts will make it feel like an unstoppable force. For Zane players, pairing the Kaoson with his kill skill fire rate boosts and shield recharge perks lets you stay in close quarters for entire fights, spamming chaos orbs to clear entire rooms in seconds. The 100% ADS accuracy bonus pairs perfectly with his sniper scope skill, letting you hit long-range shots with the SMG that you’d normally only land with a dedicated sniper rifle.
Amara players will get a ton of value out of the Kaoson too, since her status effect boost perks make the chaos orb explosions hit 70% harder than base. If you run her melee combo build, the bleeding damage perk on the Kaoson will stack with her melee bleed effects to take down raid bosses in half the normal time. Even Moze players, who usually lean into heavy explosive weapons, can make great use of the Kaoson by pairing it with her Iron Bear ammo regeneration perk, which lets you fire the gun nonstop without ever reloading.
You don’t need a min-maxed endgame build to use the Kaoson, though. I used a base variant with no extra perks on my first casual playthrough as Fl4k, and it one-shot most common enemies even without any SMG-specific damage perks allocated. It’s one of the most accessible powerful weapons in the game for new and veteran players alike.
At the end of the day, the borderlands 4 kaoson is one of the few legendary weapons that lives up to all the hype online. It’s easy to farm, works for almost every playstyle, and stays relevant from the early game all the way through Mayhem 10 endgame content. You don’t have to grind for 10 hours to get a good roll either, even a base variant with no extra perks will outperform most purple SMGs you’ll find while playing. If you haven’t picked one up yet, add the Chaos Warden farm to your next play session, you won’t regret it.