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Borderlands 4 Guide

Sludgemaw Boss Guide

Beginner
Late Game
Bosses
Updated on Oct 23, 2025
Oct 23, 2025

Overview

WARNING: This guide contains spoilers for the story of Borderlands 4

Sludgemaw is a huge thresher boss that can be encountered at the end of The Outbounders faction mission, All Charged Up.

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Sludgemaw


Drops

Item

Type

Details

Birt's Bees

SMG

Hivemind: Shoots out a swarm of projectiles, Spews erratic projectiles that home in on targets.

Kickballer

Shotgun

Alt fire launches bouncing energy disc.

Onion

Armor Shield

On Armor Segment break, grants immunity to dmg for 2s.

Location

Sludgemaw is located in Watershed Gate around north of Idolator's Noose in the Fadefields.

In order to gain access to Sludgemaw you will need to progress through the the All Charged Up Faction mission.

borderlands 4 sludgemaw location

How to Beat

FIGHT TLDR

  1. Shoot Sludgemaw when he's above ground
  2. Dodge back when Sludgemaw resurfaces under you

Mechanics

Burrow

What Happens: Sludgemaw dives underground attempting to resurface underneath you, dealing damage.

What to do: Keep an eye on the ground below you and dash away if you see him coming up. You can also use that time to reload your guns.


As he's coming up, get away.


Tentacle Swipe

What Happens: Sludgemaw swipes a wide melee attack, dealing damage and knocking back.

What to do: Avoid frontal melee at all costs.

Dodge backwards!


Grub Spawn

What Happens: Sludgemaw regurgitates rubbish and summons small Grubs to join the fight.

What to do: The grubs die in one hit but can be useful to keep around for Second Winds. This attack only goes off if you are out of range of Sludgemaw's Burrow, i.e on top of a box.

Chunks of trash heralding a wave of worms.


Tips & Tricks

  • Keep the Grubs alive for Second Wind or Kill Skill synergies.
  • Sludgemaw has one Flesh healthbar making him vulnerable to 🔥Incendiary
  • Audio cues can help determine when Sludgemaw is about to resurface as sometimes it's behind or underneath you which is hard to spot.
  • Tracking mechanics such as sticky grenades will follow the boss under the ground, alerting you of their location.

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