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Unkillable Build for Captain Fieser

Build by:

Date:

24 Mar 2026

This build is designed specifically for Captain Fieser, the 2nd boss in the Iron Horse raid. It provides 100% burn resistance, high armor, armor regeneration, and enough damage to quickly take out the boss’s glowing backpack when needed.


Weapons Setup


You can use your Stoner LMG to target weak points and The Revenant Rifle to maintain your survival by priming armor bonuses.


Boss Mechanics Advantage


This build has everything you need to handle Captain Fieser’s mechanics smoothly. It allows you to complete the raid mechanics without hassle and gives you time to focus on reading error cores in the control room.


Additional Uses
  • Can serve as a diagnostic tank and hold aggro for the 3rd boss.

  • Useful in the last part of the 4th boss encounter.

Team Support


You also provide 50% of your total armor to teammates, making it easier for DPS players to survive and focus on dealing damage.


Summary


This build ensures survivability, damage output, and team support—perfect for mastering Iron Horse raid encounters.

Weapons options 

Exotic

Rifle

The Ravenous

Attributes

Rifle Damage

Critical Hit Damage

DMG to target out of Cover

Geri and Freki

On trigger pull, fire both barrels at once. When fired from the right shoulder, hits add offensive primers, and defensive primers when fired from the left shoulder. Hits from one shoulder will detonate all of the opposite shoulder's primers when present. When detonated, each offensive primer deals 100% weapon damage, while each defensive primer grants 4% bonus Armor and 10% amplified damage to Armor plates for 5s. Primer effectiveness is doubled at 10 stacks.

High-End

Light Machine Gun

Stoner LAMG

Attributes

LMG Damage

DMG to target out of cover

Health Damage

Measured

The top half of the magazine has 25% rate of fire and -15% weapon damage. The bottom half of the magazine has -18% rate of fire and 30% weapon damage.

Named

Sidearm

The Harvest

Attributes

Pistol Damage

-

DMG to target out of Cover

Optimist

Weapon damage is increased by 3.5% for every 10% ammo missing from the magazine.

Gear

Brand Set

Mask

Gila Guard

Core Attributes

Armor

Attributes

Hazard Protection

Armor Regen

Gear Mod

Burn Resistance

Brand Set

Backpack

Gila Guard

Core Attributes

Armor

Attributes

Hazard Protection

Armor Regen

Gear Mod

Burn Resistance

Adrenaline Rush

Whenever you are within 10m of an enemy, gain 20% bonus armor for 5s. Stacks up to 3 times. Cooldown: 5s

Named

Chest

Pointman

Core Attributes

Armor

Attributes

Hazard Protection

Armor Regen

Gear Mod

Burn Resistance

Perfect Vanguard

Deploying a shield makes it invulnerable for 5s and grants 50% of your armor as bonus armor to all other allies for 20s. Cooldown: 25s

Brand Set

Gloves

Belstone Armory

Core Attributes

Armor

Attributes

Hazard Protection

Armor Regen

Gear Mod

Exotic

Holster

Dodge City Gunslinger's Holster

Core Attributes

Weapon Damage

Attributes

Weapon Handling

Headshot Damage

Gear Mod

Quick Draw

While your pistol is holstered, gain a stacking buff every 0.3 s, up to 100. When you swap to it, your first shot consumes the buff and deals 10% damage per stack. This deals headshot damage wherever you hit. Required: Pistol equipped.

Named

Kneepads

Emperor's Guard

Core Attributes

Armor

Attributes

Armor Regen

Hazard Protection

Gear Mod

Skills and Specialization

Demolitionist

Reviver Hive

Crusader Ballistic Shield

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