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Borderlands 4 Build

Mills Boss Melting and Mobbing Rafa Build

presentationRafa
Creator
Updated on Sep 28, 2025
Sep 28, 2025

Build Overview

This build created by MillGaming will use Rafa in two different play styles. mobbing and boss melting.

below you will see the skill tree and how it ties together to create a broken and overpowered build.

most importantly by using Bullet-Buddy Deluxe to melt bosses, this skill will allow Rafa to use unlimited bullets. pairing this with San Saba Songbird or Bod will cause any boss to die in seconds.

Instinto will be the choice for mobbing due to the constant up time of your skills, crit hits and Firewerks shield killing enemies, its by far the best choice for this build for mobbing.

Strengths And Weaknesses

  • boss melting
  • amazing mobbing
  • crit knife

Build Variants

looking for gear that will increase your gun damage and also skill damage will be a priority.

best choice in weapons i have used is

Bod

Hot Slugger

Rainbow Vomit

San Saba Songbird

these are all great choices for mobbing and bossing.

Skill Tree

Points Spent 0 / 49
LMB Allocate
RMB Unallocate
Peacebreaker Cannons
5/5
5/5
2/5
3/3
5/5
4/5
1/5
5/5
4/5
1/5
3/3
5/5
5/5
1/1

Equipment

Weapons
Repkit & Ordnance
Utilities

most importantly is using the Triple Bypass to constantly have your skill running and it also have 3 chargers which will come in handy.

Firewerks shield is by far the best choice here due to the missiles and crit changes after every kill and that will also stack onto the boss too.

an enchantment with gun damage and crit damage will be the best choice.

you will need a crit knife to fully optimize this build but its not needed.


best choice in weapons i have used is

Bod

Hot Slugger

Rainbow Vomit

San Saba Songbird

Specialization

Specialization 1In The Zone
Specialization 2Now With Caffeine
Specialization 3I Am A Gun
Specialization 4A Honed Mind

these choices were made to increase our damage output as much as possible.

Gameplay

by using all your skills, repkit and crit knife you will have unlimited ammo to destroy any boss.

Table of Contents

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