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Borderlands 4 Build

Exo Master Rafa Build

presentationRafa
presentationPeacebreaker Cannons
End Game
Updated on Sep 21, 2025
Sep 21, 2025

Build Overview

This build focuses on dealing maximum damage in small windows with the help of the Super Soldier and abusing the infinite ammo provided through Metal Management to make bossing a piece of cake thanks to the Vertex, a non-legendary Maliwan shotgun with the Beam Tosser alt-fire mode but also doesn't hold back in the mobbing arena either.

Some Rafa builds struggle when Overdrive is inactive but this one aims to extend its uptime and reduce the time between activations.

While mobbing we use the Peacebreaker Cannons with the Instinto augment and Volatile Hollowpoints capstone to maximise its uptime and make use of Rafa's splash damage bonuses.

We want to use high powered explosive weapons like the Boomslang or Hot Slugger to super charge the first shot of each magazine thanks to First Impression. With the ammo regen provided by Las Jaras in combination with the Super Solider each shot of the Boomslang gets that massive gun damage bonus and the Hot Slugger can even fire multiple times between reloads even though it only has 1 round in its magazine!

When it comes to bossing we switch it up to the APOPHIS Lance with the Battery Subscription Service augment. This augment gives as four charges instead of 3 and because Metal Management gives us 2 seconds of free ammo each time we activate or reactivate an action skill we get 10 SECONDS of free Beam Tosser spam that will annihilate pretty much anything!

Strengths And Weaknesses

  • Easily one shot mobs
  • Comfortably melt bosses
  • High Action Skill/Overdrive uptime
  • Beam Tosser is rare

Skill Tree

Points Spent 0 / 49
LMB Allocate
RMB Unallocate
Peacebreaker Cannons
5/5
5/5
2/5
3/3
5/5
5/5

Peacebreaker Cannons with Volatile Hollowpoints for mobbing; kills enemies and can trigger Juerga for extended lifetime, made easier with the Instinto augment. All while allowing us to use whatever gun we'd like.

Deft Hands and The Thrill maximize our use of the free ammo window provided by Metal Management

Temerario for increased Gun Damage

Barrage for increased Splash Damage

Jaque and Mate for Overdrive bonuses and Action Skill Cooldown

First Impression maximizes the power of the first shot of each magazine

El Valiente for increased damage the greater our shield capacity


Equipment

Weapons
Repkit & Ordnance
Utilities

The Maliwan shotgun we're looking for is one with the Beam Tosser alt-fire mode.

Any high damage single shot explosive weapon will slot into this build just fine.

Dancer - ideally with a point in Soltado so we can put the extra point into First Impression

AF1000 - ideally with a Splash Damage roll

Super Soldier - we only get it's effects when it is full so keep that in mind.

You can look for amp repkits & amp shields to maximise your one shot potential.

Firmware

Repkit & Ordnance
Repkit FirmwareDeadeye
Ordnance FirmwareDeadeye
Utilities
Class Mod FirmwareAirstrike
Shield FirmwareDeadeye
Enhancement FirmwareAirstrike

Airstrike for splash damage - only need 2/3

Deadeye for crit/crit damage stacking

Specialization

Specialization 1Bullet Train
Specialization 2Now With Caffeine
Specialization 3One Shot, One Kill
Specialization 4The Best Defense

Bullet Train increases our gun damage the faster we move, Overdrive & the Super Soldier both increase our movespeed

Now With Caffeine increases Action Skill Uptime

One Shot, One Kill (not used in the attached video) massively boosts one shot potential

The Best Defense (not used in the attached video) increases our damage the higher capacity our shield has. Another reason to take care of our shield.

Gameplay

Mobbing

  • Activate Peacebreaker Cannons, pop the AF1000 and go to town
  • The more kills/criticals we land, the longer Overdrive will be active
  • When our Action Skill ends make sure to pop the AF1000 to bring it back sooner

Bossing

  • Equip the APOPHIS Lance with the Battery Subscription Service augment
  • Pop your repkit & make sure the super solider is full
  • Pull out the Beam Tosser, activate your action skill and start firing. Shooting the APHOSIS Lance every couple of seconds will have you firing OVER 30 BEAMS way more than the typical 3
  • Get that loot!

Changelog

09/21/25 - version 1.0.0

Video Guide

Table of Contents

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