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Borderlands 4

Onslaughter Fire Amon Boss Farm Build

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Borderlands 4 - Onslaughter Amon Farm Build

The Onslaughter Amon build stacks gun and fire damage, with continuous burning status effects to make farming bosses easy for Amon in Borderlands 4. See the best build, skills, weapons, and gear to use for Onslaughter Amon, along with the best skill tree abilities and character playstyle.

All Amon Guides
Best Builds Cosmetics Skill Trees and Voice Actor
Leveling Build Boss Farm Build Melee Build
Crucible Build

Onslaughter Fire Amon Build Strengths and Weaknesses

Strengths Weaknesses
✔︎High Single Target DPS
✔︎Extremely simple playstyle
✔︎High Incendiary damage
✖︎Locked to Incendiary Guns
✖︎Relies on active skill
✖︎Weaker against Shield and Armor

The Onslaughter Fire Amon Build capitalizes on Amon's Calamity Skill Tree to buff his Incendiary and Gun damage. With Onslaughter Active, you simply need to aim at the boss and keep firing to melt down its HP quickly.

Due to this build's focus on Incendiary weapons, this means that you are effectively locked into using Incendiary weapons only, since other elements will not receive the same damage buffs from your skills. While you deal large amounts of burn damage against enemies, it also means that you have lower damage against Shields and Armor due to elemental affinities.

Onslaughter Fire Amon Best Skills

Amon Best Action Skill

Skill Tree OnslaughterCalamity
Action Skill: Onslaughter

The Onslaughter build uses the Calamity tree to stack incendiary damage, gun damage, and status effect boosts, massively increasing your fire weapon DPS. Activating the Onslaughter Action Skill also grants shield regeneration for survivability and bonus fire damage, often giving you enough burst to wipe out a boss in a single activation.

Amon Best Passive Skills

Best Passive Skills

Calamity
Vengeance
Skill Tree Priority Skills
OnslaughterCalamity
What Burns Within Icon Wield the Storm Icon Bullet Storm Icon Burning Ramparts Icon Maiming Strike Icon Catastrophe Icon Dragon Crackling Aegis Icon Electrical Fire Icon
Skill Tree Priority Skills
VengeanceVengeance
Wrath of Nature Icon Scorched Kairos Icon The Thrill (Amon) Icon Battleborn Icon

The best skills for the Onslaughter build in the Calamity tree enhance status effects while stacking direct boosts to Gun and Incendiary damage.

From the Vengeance tree, prioritize The Thrill early for consistent health regeneration.

Recommended Skill Progression

Recommended Skill Progression
What Burns Within Icon Lvl 2 What Burns Within Icon Lvl 3 What Burns Within Icon Lvl 4 What Burns Within Icon Lvl 5
What Burns Within Icon Lvl 6 Wield the Storm Icon Lvl 7 Wield the Storm Icon Lvl 8 Wield the Storm Icon Lvl 9
Wield the Storm Icon Lvl 10 Wield the Storm Icon Lvl 11 Bullet Storm Icon Lvl 12 Bullet Storm Icon Lvl 13
Bullet Storm Icon Lvl 14 Bullet Storm Icon Lvl 15 Bullet Storm Icon Lvl 16 Burning Ramparts Icon Lvl 17
Burning Ramparts Icon Lvl 18 Burning Ramparts Icon Lvl 19 Burning Ramparts Icon Lvl 20 Burning Ramparts Icon Lvl 21
Maiming Strike Icon Lvl 22 Maiming Strike Icon Lvl 23 Maiming Strike Icon Lvl 24 Catastrophe Icon Lvl 25
Catastrophe Icon Lvl 26 Catastrophe Icon Lvl 27 Catastrophe Icon Lvl 28 Catastrophe Icon Lvl 29
Crackling Aegis Icon Lvl 30 Crackling Aegis Icon Lvl 31 Crackling Aegis Icon Lvl 32 Dragon Lvl 33
Dragon Lvl 34 Electrical Fire Icon Lvl 35 The Thrill (Amon) Icon Lvl 36 The Thrill (Amon) Icon Lvl 37
The Thrill (Amon) Icon Lvl 38 Wrath of Nature Icon Lvl 39 Wrath of Nature Icon Lvl 40 Scorched Kairos Icon Lvl 41
Scorched Kairos Icon Lvl 42 Scorched Kairos Icon Lvl 43 Scorched Kairos Icon Lvl 44 Scorched Kairos Icon Lvl 45
Battleborn Icon Lvl 46 Battleborn Icon Lvl 47 Battleborn Icon Lvl 48 Battleborn Icon Lvl 49
Battleborn Icon Lvl 50

From Levels 1~35, focus on stacking points into gun, incendiary, and status effect passives, rushing toward the third Calamity branch to unlock its Augment and Capstone. With these passives in place, you can start effectively soloing bosses for farming.

From Level 36 onward, invest in the Vengeance tree to improve survivability while further boosting DPS through enhanced status effects, magazine size, and gun damage.

Amon Best Augment

Fulminating Fist Icon Fulminating Fist
Tree Calamity
(Branch 3)
Effect
Amon gains increased Status Effect Chance while Onslaughter is active. Pressing Action Skill launches a concentrated Lightning Wave that deals Shock Melee Attack Damage to enemies it passes through.

Pick up Fulminating Fist to increase Status Effect Chance while Onslaughter is active, enabling more elemental procs for significant damage-over-time. It also converts the fist into a ranged lightning attack, making it useful against shielded enemies.

Amon Best Capstone

Stormcutter Icon Stormcutter
Tree Calamity
(Branch 3)
Effect
Molten Slam is now Stormcutter. Press and hold Action Skill to swing a Massive Forgesword, launching a Forgewave that deals Shock Melee Damage to all enemies it passes through. Restore Action Skill Cooldown, Action Skill Duration, and Ordnance Cooldown for each enemy hit.

Stormcutter is a great tool for cutting through boss and enemy armor while also reducing Onslaughter’s cooldown or extending its duration if already active.

Amon Best Specializations

Specialization Tree and Effect
Riddle You This Icon Riddle You This
Brute Icon Brute Tree

Whenever the Vault Hunter deals Gun Damage, gain a Stack of Riddle You This, increasing Gun Damage.
Stacks are lost if a new Stack has not been gained for a Duration.

Gun Damage: +1% per Stack
Maximum Stacks: 50
Duration: 6 seconds
Groundbreaker Icon Groundbreaker
Runner Icon Runner Tree

Non-Melee Attack Damage and Slam Damage are Stored.
Melee Attacks and Slam deal Bonus Kinetic Melee Damage based on Stored Damage, and consume it.

Stored Damage: 20%
Stored Damage Duration: 5 seconds
Now With Caffeine Icon Now With Caffeine
Daredevil Icon Daredevil Tree

Reduce Action Skill Cooldown whenever a Repkit is activated.

Action Skill Cooldown Reduction: 25%
I Am A Gun Icon I Am A Gun
Daredevil Icon Daredevil Tree

Action Skill Damage now benefits from increases to Gun Damage.

Action Skill Damage: 50% of increases to Gun Damage.

These specializations give a significant damage boost to both your melee and gun damage.

List of All Specializations

Onslaughter Fire Amon Best Equipment

Jump to a Section!
Weapons Repkit Ordnance
Class Mod Shield Enhancement
Firmware Sets

Amon Best Weapons

Best Legendary Weapon for Onslaughter Amon

Legendary Gun Overview
Hellfire Type: SMG
Manufacturer: Ripper
Burning Desire
Ripper - This Gun charges before Full Auto firing

The Hellfire SMG is the absolute best weapon to use when using the Onslaughter Fire Amon build. Its high rate of fire and legendary passive that shoots Incendiary rounds synergizes extremely well with all of Amon's Calamity skills that buff Incendiary damage.

Best Manufacturer for Onslaughter Amon: Ripper

Ripper guns that apply fire status effects are excellent for this build, offering a rapid rate of fire after a short spin-up that melts through enemies and can beam down bosses with sustained fire.

Best Primary Weapon: Incendiary SMG

SMGs are ideal for Onslaughter Amon, offering rapid fire, constant DPS, and great mobility for run-and-gun play. Use elemental variants, especially incendiary for good damage even at range.

Elemental Weakness Chart and Damage Guide

Best Secondary Weapon: Incendiary Shotgun

When fighting bosses or mobs on the ground, get in close with an Incendiary Shotgun to deal massive burst damage while applying strong burn effects for sustained DPS.

Amon Best Repkit

Repkit Unique Trait
Shiny War Paint
Shiny War Paint
Chrome: On use, grants +30% Fire Rate and +30% Movement Speed for 15s, and reduces Repkit Cooldown by 2s each time Damage is taken.

With Shiny War Paint, Amon can use a Repkit to gain increased Fire Rate and Movement Speed, which will allow your Hellfire SMG to deal even more damage.

Amon Best Ordnance

Ordnance Type and Overview
Gamma Void
Grenade Ordnance

Radiation Exposure: Creates a Singularity for 10s, in which enemies take +40% Radiation Damage over time

The Gamma Void grenade ordnance creates a Singularity that pulls in mobs, giving you additional crowd control against mobs during a Boss Fight.

Gamma Void also deals continous Radiation Damage, which can be helpful in dealing additional damage to enemies with Shield or Armor HP.

Amon Best Onslaughter Class Mod

The Melting Furnace Legendary Class Mod is the best option for this Amon build, significantly boosting your Incendiary output. It can be farmed as a drop from Idolator Sol.

Before this, you can also use normal Class Mods that add skill points in the Calamity tree and provide passive boosts to status effect damage and gun damage.

Amon Best Shield

Shield Type and Overview
Super SoldierSuper Soldier
Energy Shield

Power Play: When Energy Shield fills, grants an Overshield. When Energy Shield is full, grants 25% Fire Rate, 25% Movement Speed, and regens 1 Ammo/s.

Super Soldier is the best shield option for the Onslaughter Amon Build, since it provides Fire Rate, Movement Speed, and Ammo Regen when the shield is full.

How to Get Super Soldier

Amon Best Enhancement Mods

Enhancement Effects
Ripper Enhancement High Roller - Guns with Ripper-licensed parts increase Gun Damage by 2% for each consecutive shot fired, for a Maximum 25 stacks.
Gun Status Effect Damage - Increased by +25%.

Equipping a Ripper Enhancement with the High Roller effect is best for damage. Ones with Gun Status Effect Damage or raw Gun Damage increases are ideal as well.

Amon Best Firmware Sets

Set Bonus Effects
Deadeye
3/3
・Gun Accuracy is increased by 30%
・Gun Critical Hit Damage is increased by 25%
・Every Critical Hit grants 15% Critical Damage per Stack (5 max stacks) for 10s
Action Fist
2/3
・Melee Damage increased by 15%
・Action Skill Damage increased by 10%

This Firmware loadout provides a balance damage boost for your Melee and Gun Damage.

List of All Firmware Sets

Amon (Forgeknight) Boss Farming Guide

Use Onslaghter Action Skill Before Fights

At the start of boss fights, activate Onslaughter to gain a massive boost in incendiary damage, status effect application, and shield regeneration, allowing your weapons to burst down enemies much faster.

Continously Shred Bosses With Burn Damage

Burn damage is the key to this build, so keep up constant fire on the boss, focusing especially on critical hit spots to maximize your DPS. With incendiary status effects stacking rapidly, the damage will stack up fast.

Use Backup Weapons for Shield and Armor

If a boss is resistant to fire and has shield or armor health bars, switch to the appropriate element to counter them effectively. While this build excels with incendiary damage, it still delivers strong status effect damage with other elements, though you won’t burn through shielded or armored bosses as quickly as those with red health bars.

Elemental Weakness Chart and Damage Guide

Best Onslaughter Amon Build Playstyle

Optimized for Boss Farming

Boss Farm Moxxi Spawn

This Amon build is specifically designed for Boss Farming, putting heavy investment in Amon's Incendiary and Status Effect damage.

Through our testing, Normal Bosses in Hard difficulty can be cleared in less than 1 minute under optimized conditions.

How to Farm Bosses

Great Single Target Damage, Lesser Mob Clear

This build specializes in single-target burst DPS. It can still be used for leveling and clearing the story, but it's weaker at clearing large groups of powerful enemies, especially the large number of armored Order enemies.

If you are facing difficulties in using this build for leveling, you can try a more survivable build. Our Amon leveling build is more tanky, has powerful Cryo AoE for mobs, and solid boss clearing.

Best Amon Build and Leveling Guide

Borderlands 4 Related Guides

Borderlands 4 - Builds

Best Builds for Each Vault Hunter

All Character Builds

Character Build
Vex the Siren IconVex
Rafa the Exo-Soldier IconRafa
Amon the Forgeknight IconAmon
Onslaughter IconOnslaughter Fire Boss Farm
Harlowe the Gravitar IconHarlowe

Comment

2 Anonymous Anonymous 3 months

maybe just give us a screenshot of the actual build? i dont care for a recommended skill path... just screenshot it so i can click and get to it...

1 UmbreonBro UmbreonBro 3 months

How are you supposed to get the branch three capstone if the levelling guide recommends purchasing skills from branch two?

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