Borderlands 4 How to Unlock the Legendary Onslaught SMG

Onslaught's strength is its incredibly high rate of fire. The "Keep It Coming" passive grants a 30% Chance for Ammo to not be consumed, while also increasing the damage dealt.

It's also very forgiving when it comes to overheating, allowing Onslaught to shoot rapidly in succession much longer than normal.

Unlock Location:

• Advance to the big main story boss of the Fadefields.
• Go to Fortress Indomita, located within the Idolator's Noose sub-region.

Farm Method:

• Defeat Idolator Sol at Fortress Indomita.
• Use the Encore Machine to farm Idolator Sol until Onslaught drops.