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Borderlands 4 Build

DRONEMANCER | Underbarrel Vex (UVH5)

presentationVex
presentationIncarnate
End Game
Creator
Updated on Nov 29, 2025
Nov 29, 2025

Build Overview

Dronemancer Vex!

This is a build centered around snapshotting on-shot damage boosts like Blood Shot, Amp and some Enhancement boosts into Order AR Drone underbarrels. Its original concept was made and used on Vex by the user Katchenz (check out their profile!), and we have since then improved it in all manners we could.

This build also doubles down as a serious Underbarrel Build. With the right setup you can somewhat spam Tasers and use other potent Underbarrels amped up by Blood Shot. This is a seriously potent fallback in case the drone memes are not to your liking.

A video guide is also available!

Want to snipe and have potent underbarrel access? Check out Blood Fang Vex.

Strengths And Weaknesses

  • Absurd mobbing power. Things literally pop into little giblets right in front of you
  • Extremely strong bossing
  • Underbarrel variety
  • Can massively boost just about any underbarrel shot, making this one of the most effective bossing setups available for Vex
  • Purple rarity weapon requirement for drones
  • Bits of downtime if the drone AI doesn't cooperate or if you spam too much

Build Variants

The default Dronemancer skill tree setup.

Skill Tree

Points Spent 0 / 49
LMB Allocate
RMB Unallocate
Incarnate
5/5
5/5
5/5
5/5
5/5
5/5
1/5
5/5
3/3

Vexcalation

Here we stack up on passive damage boosts. To that we add Blood Shot as an on-shot damage boost, which will turn our drones into amped skill damage drones. The drones will then get crit chance from both Target Prescience and Keen Mind.

Finally, Blood Is Power is added as a Bonus Element that will apply to the drones. We further boost it through the lifesteal from Teen Witch, Leeching Attunement and Essence Leech.

Geistwave is available for boss debuffing. For running about and mobbing, use Grave Harvest.

Here Comes Trouble

On this tree, we max Enchantment since it will apply to our gun sources. It also benefits from Blood Shot and our other on-shot boosts. Blood Is Magic provides Bleed and Impact damage.

Equipment

Weapons
Repkit & Ordnance
Utilities

Weapons

You can play into the drones or mix in any other powerful underbarrels.

The main loadout here consists of Order AR with the Kill Drone Underbarrel, alongisde a torgue-licensed part so it nets you access to Torgue Head Ringer for a completely passive on-shot boost.

  • The Goalkeeper AR can spawn with Kill Drones, although it doesn't seem to get Torgue parts. It's still more than enough until you replace it with a perfect purple.
  • Tediore Pistol Attack Drones are okay and can spawn with torgue-licensed parts! They don't last as long though.

For other underbarrel choices, you have:

Repkit

Triple Bypass with Amp is the highest consistent Repkit synergy we can get for this, since it's a gigantic on-shot damage boost.

Order Repkit with Amp + Enrage. Bleed double dips Enrage's damage boost.

Ordnance

Here you mainly want something to deal with Vile Crystal enemies, or increase bossing damage.

'Crit Knife' Jakobs Grenade is free damage for bossing.

Slippy is a good option for vile enemies.

Sho Kunai is fun for bossing and a good alternative to Crit Knife if you dislike that, since the movement speed directly boosts our damage through Bullet Train.

One-shot wonder Heavy Ordnances with high base bamage can be excellent and fun here, since you can Repkit for Blood Shot on a singular Ordnance shot.

Class Mod

Teen Witch Class Mod

Provides the most consistent damage boost and protects our Blood Is Power boost. As for skill rolls, Blood Is Magic (which is actually Skill Damage) gives the most consistency, since it simply passively boosts the damage of Blood Shot.

Stat rolls to look for are:

  • Kinetic Damage (Bleed double dips this modifier)
  • Skill Damage (Bleed double dips this modifier when using Blood Shot)
  • Skill or Gun Crit Chance (either works, but Skill applies to both the Bleed and the Drones)

Any of these stats are a good roll for this. My preference would be between Skill Crit Chance or Kinetic Damage.

Psion Vex Class Mod

Possibly the best and most consistent for bossing with many of the underbarrel options. Shines even more on bosses that have accessible crit spots depending on the underbarrel you use.

Ideal Skill rolls would be:

  • +5 Bloodletter: +2 Leeching Attunement or +2 Material Components

Stat rolls to look for are:

  • Kinetic Damage or Skill Damage;
  • Status Effect Chance;
  • Skill Crit Chance.

Transistor Vex Class Mod

A bit of a gimmicky bossing choice, but cool and effective. The Drones, Tasers, Space Laser and Spread Launchers can trigger Deadwire quite well. A well-rolled version of this class mod is great for some of these underbarrels.

Ideal Skill rolls would be:

  • +5 Deadwire; +2 Target Prescience

Stat rolls to look for are:

  • Kinetic Damage and/or Skill Damage;
  • Skill Crit Chance and/or Gun Crit Chance
  • Status Effect Chance

Shield

Guardian Angel with Amp is the best choice for using Psion or Transistor Class Mods.

Watts 4 Dinner with Amp is the general best for Teen Witch.

Protean Cell is another offensive option, although mostly workable with Teen Witch, unless you're quick enough with the others.

Enhancement

Torgue Head Ringer is the main choice if your Order AR has a torgue-licensed part alongside the Kill Drones. Also works for some of the other guns' underbarrels since they get torgue-licensed parts.

If you want to focus on Tasers, the Dog Movement is ideal. Hero of Bullet is ok too, though less forgiving and more rng-reliant. Purple versions (Underdog and Bullet Hose) are also excellent.

Gun Damage and Gun Type Damage on enhancements works differently than on other gear. That makes the ideal stat rolls that will boost our on-shot damage the following:

  • Gun Damage
  • Gun Type Damage
  • Gun / Gun Type Crit Damage
  • Weapon Equip Speed (for ease of use of the Underbarrels)

Firmware

Repkit & Ordnance
Repkit FirmwareDaed-dy O
Ordnance FirmwareDaed-dy O
Utilities
Class Mod FirmwareHigh Caliber
Shield FirmwareHigh Caliber
Enhancement FirmwareDaed-dy O

3/3 Daed-dy O; 2/3 High Caliber

  • Overall strongest firmware setup. Requires a bit of involvement and conscious activation of Daed-dy O's boost, but it is snapshotted and very powerful.

2/3 Deadeye; 2/3 High Caliber; 1/3 God Killer

  • Completely passive boosts for big damage instances, like Spread Launcher, Big Rocket, Knife Launcher etc.

3/3 Deadeye; 2/3 High Caliber

  • This is an option when using weaponry that can continuously damage a weak spot, like Tasers.
  • A bit niche compared to just using something more generalist, but it's fun.

3/3 High Caliber; 1/3 God Killer; 1/3 Daed-dy O or 1/3 Airstrike

  • This allows you to shoot through enemies and at the ground with a spread launcher (and any other splash underbarrels that also get the piercing effect) for doubled hits.

Specialization

Specialization 1Bullet Train
Specialization 2I Am A Gun
Specialization 3A Honed Mind
Specialization 4The Best Defense

We’re grabbing everything that will directly or indirectly boost our Blood Shot and drone damage.

Bullet Train. This gun damage applies on-hit, meaning we can shoot out a drone and stay on the move to guarantee it some increased gun damage.

I Am A Gun will feed back half of any on-hit gun damage we get from other sources as Action Skill Damage. This will further boost Blood Shot and therefore the drones.

  • Contamination and/or Riddle You This are valid replacements to Bullet Train + I Am A Gun.

A Honed Mind for its crit chance to the Blood Shot drones, and the extra critical damage.

The final choice is between The Best Defense and Riddle You This.

  • If you want more frontloaded damage, go with the The Best Defense
  • If you want a higher peak, Riddle You This.
  • This choice also depends on the weapon type. You obviously want The Best Defense for a Spread Launcher, but for Drones and some others there's nuance to the choice.

Gameplay

Every time we use our Repkit, we get a Blood Shot.

That's when we shoot out a drone. Proceed to let it do its job for a while, then repeat the cycle with our next drone.

This way, we're cycling the drone cooldowns and will minimize downtime.

You can mix up the loadout with more of the strong underbarrels listed on the build.

Vile Crystal enemies can become a real nuisance. Keep out a special watch for them spawning, because it can really result in a drone being wasted.

  • Slippy and AoE Underbarrels are other options.
  • One-shot wonder Heavy Ordnances with high base damage can be excellent to deal with them, since you can Repkit for Blood Shot on a singular Ordnance shot, without having to give up any gun slot to deal with Viles.

Changelog

Nov. 4th 2025 - Added Transistor Class Mod option. Pretty good and pretty cool.

Oct. 25th 2025 - Small firmware update for more options.

Oct. 18th 2025 - Added Heavy Ordnance to the gear choices.

Video Guide

Table of Contents

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