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Borderlands 4 Build

HORBA - 1-Shot Ordnance Amon Build

Amon

Scourge

End Game

Creator

By AncientRune

Updated on Nov 19, 2025

Nov 19, 2025

Build Overview

Heavy Ordnance Ricochet Banaza Amon

Also known as HORBA! This is the ultimate amon build that I predicted pre launch but with some adjustments with all the info post launch. Using Heavy Ordnance with high power you can do some insane stuff and melt bosses on Ultimate Vault Hunter 5.

Focuses on Heavy Weapon Ordnance dealing high base damage combined with Tail of the Comet for high single target and using certain weapons for amazing mobbing.

Heavy Weapon Ordnance benefits from both Ordnance and Gun damage as well as benefits from ammo regen and which allows up to keep up our ordnance infinitely. This means we don't have to go about worrying about Ordnance cooldown.

Strengths And Weaknesses

Bossing
Mobbing
Survivability

Somewhat Gear Specific
Fight For Your Life depends on shooting your gun which is not the focus

Skill Tree

Points Spent 0 / 49

LMB Allocate

RMB Unallocate

5/5

3/3

5/5

3/3

5/5

ACTION SKILL

Main/Bossing:

Scourge - used for the survivability. The less often our shield is being touched the better as our Shields need to be full

Cryonic Thrum - our preferred augment for the cryo bonus element for extra damage. As well as a little bit of healing.

We keep Firewall as our augment as it helps boost our Heavy Ordnance damage. This is a PURE MULT. Firewall is the main reason for using Scourge for bossing.

Aggressive Playstyle/Mobbing:

Onslaughter - bonus element applies to Heavy Ordnance, Shield Regen for Shields, and movement speed for mobbing to get from enemy to enemy faster.

Pyroclast - used for the fully restore shield and health on activation for better survivability. You will almost never have enemies inside the forgestorm as you will down yourself from your ordnance's splash.

Forgeskill is not used at all with this action skill as it's just not helpful.

Easy Ordnance Cooldown:

Crucible - pair this with Tripwire for easy ordnance cooldown if you end up using all your ammo.

We do not reach an augment nor does our Forgeskill do anything for us so you can just ignore that.

SKILL TREE

BLUE TREE:

The Thrill - insane survivability skill which helps with not needing to use your repkit as much.

Wrath of Nature - Increased status effect chance for Tail of the Comet and Primal Surge

Battleborn - should easily stay at full health. Goes great with Full Spectrum Arsenal

Tail of the Comet - Double dipping Status Effect based on Ordnance damage impact. Used for single target and the big damage dealer

Machinist - You really don't need this but if you mess up and your Ordnance goes on cooldown then this helps get it back.

Icy Rage - increase gun damage on cryo gun and status effect kills.

Primal Surge - Key skill to keep up Heavy Ordnance Ammo and Shields

Age of Ice - double dips and always applies to bosses.

Blackout - Gives crit chance to Ordnance. The Status Effect is a Double Dip but is bugged to only deal 1/5 of intended damage. When this is fixed this build will be even dumber.

RED TREE:

Impetus - Nice movement speed for getting around

What Burns Within - boosts Onslaughter bonus element and any ordnance that is fire element

Gut Punch - damage boost that double dips into Tail of the Comet

Equipment

Weapons

Repkit & Ordnance

Utilities

Ordnance:

Maliwan Heavy Weapon - MIRV and Two Shot parts for Hailspike. Insanely good for mobbing and bossing

Bottled Lightning - 3 mag for optimal mobbing.

Torgue Heavy Weapon - Triple Barrel and Shrapnel Rockets parts for Honey Bunches for optimal bossingw

Guns:

Jakobs Pistol - currently my stat stick for the Vial Launcher underbarrel which boosts our damage by 30% which should double dip.

Hot Slugger - just using it because it's easily strong.

Use any good gun for Fight For Your Life

Class Mod:

Not sure every passive these can roll but you can look out for status chance, action skill cooldown rate, elemental damage, all damage, splash damage. Basically anything that helps.

Amon Class Mod Cyborg - Gives points in Endless Bombardment and Primal Surge for better ammo uptime.

Amon Class Mod Icebringer - gives points into Tail of the Comet for an even stronger DoT. 10/5 is insane.

Amon Class Mod Grenadier - gives points into Blackout for even stronger dot against shielded enemies. As well as increased crit chance. Also rolls points into Blackout but not the priority.

Shield:

Watts 4 Dinner - rolls with 150% amp roll for maximum damage. can also roll Siphon w/ 100% amp. Also gives shock bonus element

Super Soldier - gives us consistent 1 ammo per shot regen. This applies to Heavy Weapon Ordnance. MUST HAVE PART is Siphon part - "When dealing damage, 10% chance to grant overshield" This helps keep up our shield effect as our shield won't be getting touched and you don't need to worry about overshield in skill tree.

Protean Cell - the bonus element applies to our status effects which is not normal for bonus elements. This makes it INSANELY STRONG for bossing. But this makes you VERY FRAGILE so for bosses that hit you a lot this is not ideal. Can also be used in mobbing because of Primal Surge.

Repkit:

Triple Bypass - the 3 charges and regain are perfect for Now With Caffeine. Get the roll with Action Skill Cooldown Rate for better Scourge cycling. Or Amp for more damage. Can also go elemental, damage dealt, or splash.

Enhancement:

Any enhancement works. Something that helps the guns you use is good. But mainly just go for good passives. Gun damage is a MULT (only additive with High Caliber gun damage in this build). Other damage bonuses are Gun splash damage, Gun splash radius, Gun equip speed.

Firmware

Repkit & Ordnance

Repkit FirmwareHigh Caliber

Ordnance FirmwareHigh Caliber

Utilities

Class Mod FirmwareHigh Caliber

Shield FirmwareGadget Ahoy

Enhancement FirmwareGadget Ahoy

2/3 or 3/3 High Caliber - Gun damage is a MULT (additive with enhancement gun damage). This makes this firmware a MUST HAVE Only go 3/3 if using Hailspike as it causes additional projectiles and MIRVs. Would recommend having your 3/3 on your Ordnance.

The rest of these choices are just in place of whats open after equippingHigh Caliber

3/3 or 2/3 Gadget Ahoy - Increased ordnance damage and some cooldown (just in case)

1/3 or 2/3 Airstrike - Splash radius is nice for hitting more enemies and splash damage applies to impact of Heavy Ordnance

1/3 or 2/3 Get Throwin - increased ordnance and splash radius is great.

1/3 God Killer - applies to bosses which double dips

Specialization

Specialization 1The Best Defense

Specialization 2Now With Caffeine

Specialization 3Fragmentation Payload

Specialization 4Full Spectrum Arsenal

Now With Caffeine - must have for cycling Scourge and Onslaughter

The Best Defense - the damage boost will double dip Tail of the Comet

Fragmentation Payload - Addition 5% additional crit chance along with our Blackout skill as well as crit damage

Full Spectrum Arsenal - easy more damage since we benefit from both gun and ordnance damage

Riddle You This - can replace Now With Caffeine for bossing. Honey Bunches does not stack this well. You also can just replace this since our action skill isn't exactly needed to do damage.

Tripwire - used with Crucible for easy cooldown. Can probably replace with Now With Caffeine

Gameplay

Mobbing:

Pretty simple. Activate Onslaughter for movement speed and bonus element.

Get shooting with your Heavy Ordnance

Pay attention to your ammo

Use your Repkit to get back your Action Skill if using Now With Caffeine

Bossing:

Activate Scourge and Firewall

Shoot your Vial Launcher for debuff

Activate Repkit for Amp

Make sure your Amp shield is full

Equip your Heavy Ordnance and start shooting. Pay attention to your ammo so you don't run out. Make sure you are keeping your shield action.

If using the Protean Cell shield then make sure to slam at the beginning

Notes

When you do any action - grapple, activate action skill, activate forge skill, mantle - will put away your Heavy Ordnance away and put it on cooldown UNLESS you are at maximum ammo. So make sure your ammo is at max before doing anything.