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Borderlands 4 Guide

Borderlands 4: Class Mods Explained

Beginner
Mechanics
Updated on Sep 15, 2025
Sep 15, 2025

Overview

Class Mods are returning in Borderlands 4, offering yet another way to customize your builds and enable wildly different setups.

This quick guide will explain how they work so that you know what to look out for on during your journey throughout Kairos!

What Are Class Mods?

Class Mods are character-exclusive upgrades, that when equipped, offer various stat buffs and powers. However, what truly makes them exciting is the additional skill points they provide.

borderlands 4 skill tree example

There are two key benefits this enables. First off, Class Mods allow you to exceed the normal point cap for each ability on the skill tree. Though more importantly, it also lets you bypass restrictions and obtain certain skills without having to spec towards it.

As you can probably imagine, this unlocks a tremendous amount of build diversity, as you're free to spend your skill points as you like while reaping the rewards within uninvested territory.

Amon Class Mods

Name

Description

Location

Blacksmith

Kill Skill. Restores some duration to Forgedrones. +gun dmg per active drone.

Umbral Foundry

Elementalist

All Affinity Skills gain a stack when one does. +Movement speed for each stack.

Fadefields - Arch of Inceptus

Forge Master

All Forgeskills can now be used once while on Cooldown.

Carcadia - Arch of Radix

Furnace

Fellfrost, Hoarcleave, Fulminating Fist, & Stormcutter is now Incendiary.

Fortress Indomita

Shatterwight

Forgewaves deals Melee. Melee while Scourge for +Cryo Efficiency & Radius.

Terminus Range - Arch of Origo

Viking

Crucible gains +2 charges, +duration, +dmg reduction while active.

Moon-Called Throne

Harlowe Class Mods

Name

Description

Location

Atomic Driver

Chroma Accelerator drains HP to 1 for amped version & gains 20% lifesteal.

Terminus Range - Arch of Origo

Bio-Robot

Entanglement creates alternating Cryo hazards & Radiation Hazards.

Fortress Indomita

Generator

TBD

Umbral Foundry

Reactor

Entangle use adds Reactor Stack. At x10, +20% dmg, fire rate, rld speed, status...

TBD

Scientist

Shock auto Entangles an Irradiates enemy & arcs Shock to nearby enemies.

Carcadia - Arch of Radix

Skeptic

Slam Stasised for R & O Darts. Shot status-effected restores 5% of Action Skill.

Moon-Called Throne

Rafa Class Mods

Name

Description

Location

Buster

TBD

Terminus Range - Arch of Origo

Dancer

+100% Overdrive Bonus. Overdrive ends on Action Skill end.

Fortress Indomita

Esgrimidor

Melee gains +10% crit chance. Crits with Melee restore +5% Action Skill Duration.

Moon-Called Throne

Filántropo

Spawns a free grenade when action skill is retriggered.

Fadefields - Arch of Inceptus

Grenazerker

Throwing a grenade or Tediore gun throws another.

Carcadia - Arch of Radix

Instigator

Firing Peace Cannon gains stack of Instigator, +2% Gun dmg per stack.

Umbral Foundry

Vex Class Mods

Name

Description

Location

Avatar

+Dmg for each active Attunement. Gain attuned elemental resistance.

Fadefields - Arch of Inceptus

Illusionist

Specters & Reapers have chance to be Badasses, guaranteed every 90s.

Moon-Called Throne

Spirits

Command skills grant +Kinetic Minion gun dmg. Command skills deal gun dmg.

Terminus Range - Arch of Origo

Teen Witch

When Max HP, Lifesteal partially applies to shields. While full, grants overshield.

Carcadia - Arch of Radix

Technomancer

Eldritch Blast deals additional Ordnance dmg. Kills or grenades reset cooldown.

Fortress Indomita

Undead Eye

Sniper Rifle kills triggers Blood Shot. 33% chance on crit to trigger as well.

Umbral Foundry

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