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Icons Campaign Unlocked through an assignment
Requires Driller Level 18
Purchased for:
Credit 8200 Credits
Jadiz 50 Jadiz
Magnite 110 Magnite
Enor Pearl 40 Enor Pearl
Initial Stats
Damage 16
Charged Area Damage 48
Magazine Size 20
Max Ammo 121
Rate of Fire
(per second)
Reload Time 3s
Charged Shot Ammo Use 5
Charged Fragment Damage 4
Charged Fragment Count 8
Charge Speed 1.0s
Effects Duration 4
Puddle Lifespan 12

The Corrosive Sludge Pump is what happens when the maintenance staff are left with too much time on their hands. A complicated network of piping, distillation bottles, and safety valves results in a very capable device indeed - lobbing globs of toxic waste at those you disapprove of has never been so fun!

— Item Description

The Corrosive Sludge Pump is the 2nd unlockable primary weapon for the Driller. It is a large sludge dispenser that fires corrosive sludge, capable of melting enemies. It consists of a number of pipes and valves wrapped around a fuel tank with a nozzle.

The Sludge Pump has two firing modes; Tapping the fire button will fire a single fragment of sludge whereas holding the fire button and releasing will fire a sludge bomb that causes several fragments to fly out upon impact.

When a corrosive projectile impacts an enemy, that enemy becomes visibly coated with sludge and takes damage over time (DoT). When the projectile impacts a surface, it creates a corrosive puddle that causes DoT to any enemy walking over it, along with slowing them down.


There are five tiers of modifications and each tier has two to three upgrades. Only one modification can be equipped per tier.

Corrosive Sludge Pump Modifications
Mod Effect In Game Description Price
Tier 1 Icon Upgrade ClipSize
High Capacity Tanks
+20 Tank Size "The good thing about clips, magazines, ammo drums, fuel tanks can always get bigger variants."
Credit 1200 Credits
Bismor 25 Bismor
Icon Upgrade ProjectileSpeed
Better Air Pressurizer
+40% Projectile Velocity "The air pressurizer is improved, making the projectiles travel faster and further."
Credit 1200 Credits
Croppa 25 Croppa
Icon Upgrade Area
Air Sensitive Compound
+ Bigger Puddles

(x1.25 Puddle Size)

"When the goo is exposed to air it expands, making puddles cover a larger area on impact."
Credit 1200 Credits
Umanite 25 Umanite
Tier 2
Icon Upgrade Area Damage
Dyse Nozzle
+24 Charged Splash Damage "With the Dyse Nozzle your charged shot is launched with more force, making it damaging on impact."
Credit 2000 Credits
Umanite 15 Umanite
Bismor 24 Bismor
Icon Upgrade Area
Atomizer Nozzle
+4 Charged Fragment Count "With the Atomizer Nozzle your charged shot will leave behind more fragments on impact."
Credit 2000 Credits
Jadiz 24 Jadiz
Bismor 15 Bismor
Icon Upgrade DamageGeneral
Potent Goo Mix
+8 Normal Shot Damage "Normal shots do more damage on impact."
Credit 2800 Credits
Croppa 50 Croppa
Umanite 35 Umanite
Tier 3
Icon Upgrade Duration V2
+2 Effects Duration, +6 Puddle Lifespan "The goo goes through a process of supersaturation after impact, making the effects and puddles last longer."
Credit 2800 Credits
Magnite 50 Magnite
Umanite 35 Umanite
Icon Upgrade Ammo
More Goo Canisters
+40 Max Ammo "You had to give up some sandwich-storage, but your total ammo capacity is increased!"
Credit 2800 Credits
Enor Pearl 35 Enor Pearl
Bismor 50 Bismor
Tier 4
Icon Upgrade Fuel
Spillback Extension
-1 Charge Cost "With the Spillback Extension added to the nozzle you spend less goo when charging."
Credit 4800 Credits
Magnite 50 Magnite
Umanite 72 Umanite
Bismor 48 Bismor
Icon Upgrade ChargeUp
Improved Spooling Mechanism
-60% Charge Time "The spooling mechanism has been improved and can get you to a full charge faster!"
Credit 4800 Credits
Croppa 48 Croppa
Jadiz 50 Jadiz
Umanite 72 Umanite
Tier 5
Icon Upgrade MovementSpeed
Protein Disruption Mix
+ Increased Slowdown Effect

(x0.75 Movement Speed for Direct DoT Effect, x0.5 Movement Speed for Puddles)

"Disrupting the protein molecules in the goo mix has made it more rigid and harder for creatures to move through."
Credit 5600 Credits
Magnite 140 Magnite
Umanite 64 Umanite
Bismor 70 Bismor
Icon Upgrade Acid
Fluoroantimonic Acid
+ Increased Corrosive Damage per sec.

(+2 Effect Damage (per tick), +4 Puddle DPS)

"A new and improved goo recipe with very aggressive properties makes every second in it more hellish!"
Credit 5600 Credits
Croppa 70 Croppa
Umanite 64 Umanite
Enor Pearl 140 Enor Pearl


Overclock calculations happen after modifiers.

Sludge pump Corrosive Sludge Pump [Expand/Collapse]
Overclock Effect In Game Description Price
Hydrogen Ion Additive
Frame Overclock Clean
Icon Upgrade Acid
Pos +0.5 Direct Hit Corrosive Damage

Pos x0.85 Direct Hit Corrosive Slowdown

"Experimental additive that activates on impact gives a small improvement to the corrosive DoT and slowdown effect of direct hits."
Credit 8800 Credits
Umanite 70 Umanite
Enor Pearl 100 Enor Pearl
Bismor 135 Bismor
AG Mixture
Frame Overclock Clean
Icon Upgrade ProjectileSpeed

Pos Projectile travels in a straight line

Pos x0 Gravity on Projectiles

"Anti-gravity pellets suspended in the sludge let the projectiles fly further and faster."
Credit 7800 Credits
Croppa 60 Croppa
Jadiz 105 Jadiz
Umanite 140 Umanite
Volatile Impact Mixture
Frame Overclock Balanced
Icon Upgrade DamageGeneral

Pos 2x Regular Shot Area Damage
Pos 2x Charged Shot Area Damage
Neg x0.5 Corrosive DoT Duration
Neg x0.75 Sludge Puddle Duration

"Special mixture increases immediate projectile damage at the cost of the long term corrosive and slowdown effects and puddle lifetime as the volatile compound evaporates much faster."
Credit 8500 Credits
Jadiz 75 Jadiz
Magnite 100 Magnite
Bismor 120 Bismor
Disperser Compound
Frame Overclock Balanced
Icon Upgrade Area Damage

Pos +4 Charged Shot Fragments
Pos +4 Fragment Area Damage
Neg -24 Charged Shot Area Damage
Neg -12 Direct Hit Damage

"Charged shots break apart into more fragments on impact and each fragment is more potent, however the initial damage of the charged projectile impact is reduced."
Credit 8800 Credits
Jadiz 135 Jadiz
Magnite 100 Magnite
Umanite 60 Umanite
Goo Bomber Special
Frame Overclock Unstable
Icon Upgrade Special

Pos Charged projectile drops fragments as it flies
Pos +4 Fragment Area Damage
Pos x1.33 Sludge Puddle Duration
Neg Charged projectile does not break into fragments on impact Neg x0.5 puddle size

"The addition of finely tuned timed separation compounds cause the charged shots to leave a trail of sludge as they fly through the air. However the projectile depletes its mass as it flies, dealing less impact damage as fragments separate and completely expiring once all fragments are dropped."
Credit 7450 Credits
Jadiz 140 Jadiz
Umanite 65 Umanite
Enor Pearl 90 Enor Pearl
Grave Goo
Frame Overclock Unstable
Icon Upgrade Kill

Pos +Grave Goo
Neg x0.5 Clip Size
Neg +1.0 Reload Time
Neg x0.7 Direct Damage
Neg +0.5 Charge Time

"Management pretends this overclock does not exist. RnD frankly dosen't know what it does either, but we've heard reports from the caves about some sort of 'living goo'. It appears to be friendly to us, for now, but it will seek the bloody bugs harder than a thirsty trawler, so I've personally cleared use for you this time."
Credit 8500 Credits
Jadiz 130 Jadiz
Magnite 160 Magnite
Bismor 120 Bismor
Sludge Blast
Frame Overclock Unstable
Icon Upgrade Shotgun Blast

Pos +Sludge Blast
Pos +100% Charged Shot Velocity
Neg x0.5 Charged Shot Area Damage
Neg +0.6 Reload Time

"The charged shot cohesion is disrupeted on firing, instantly shooting out fragments in a shotgun-like blast. While spectacular the modifications result in reduced magazine size and ammo capacity by an extented reload process."
Credit 8200 Credits
Jadiz 100 Jadiz
Magnite 120 Magnite
Umanite 60 Umanite

Stats Breakdown[]

Understanding the Weapon[]

  • Damage is how much damage is dealt upon direct impact of an uncharged shot.
  • Charged Area Damage is how much damage is dealt within the damage radius around the impact of a charged shot.
  • Charged Fragment Damage is how much damage is dealt by each fragment spawned by a charged shot.
  • Charged Fragment Count is the amount of fragments spawned by a charged shot.
  • Effects Duration is the amount of time in seconds that corrosion affects an enemy when it is directly impacted by a corrosive projectile
  • Puddle Lifespan is the amount of time in seconds that a corrosive puddle persists after a corrosive projectile lands on surface

Normal and Charged Shot Breakdown[]

Normal Shots & Charged Fragments

  • Damage Type: 50% Kinetic / 50% Corrosive
  • Damage Radius: 1m
  • Max Damage Radius: 0.5m
  • Minimum Damage: 25%
  • Hitbox Radius: 0.25m (0.20m for Fragments)

Charged Shots

  • Damage Type: 50% Kinetic / 50% Corrosive
  • Damage Radius: 2.5m
  • Max Damage Radius: 1m
  • Minimum Damage: 25%
  • Hitbox Radius: 0.45m

Corrosion Mechanics[]

Enemies hit directly or caught within the splash radius of the sludge projectiles have a 100% chance to be applied with Corrosion. (Note: Enemies walking through a corrosive puddle will not apply/refresh this effect.)

  • Damage (per tick): 8
  • Damage Type: 100% Corrosive
  • Tick interval: 0.2-0.25s
  • Duration: 4 seconds
  • Slowdown: 35% (x0.65 Movement Speed)

Puddle Properties[]

Enemies take damage for however long they remain on a corrosive puddle. (Note: This DoT stacks with the aforementioned Corrosion DoT effect.)

  • Damage (per tick): 4
  • Damage Type: 100% Corrosive
  • Tick interval: 0.2-0.3s
  • Duration: 12 seconds
  • Slowdown: 45% (x0.55 Movement Speed)
  • Hydrogen Ion Additive Overclock does not affect the puddle damage or corrosive puddle DoT or Slowdown
  • Puddle Diameter is affected by whether the puddle was created by a normal shot or a charged shot. Charged fragments create the same size puddles as normal shots
    • Normal diameter: 1.2 meters
    • Charged diameter: 2.4 meters
  • Puddles ignite after accumulating 20 Heat from any source. While burning the puddles deal additional Fire + Heat damage to enemies that walk through them
    • Additional Damage (per tick): 12 Fire
    • Heat (per tick): 12 Heat
    • Tick Interval: 0.5-1.0s

In addition to the applying a damage over time that deals both Fire and Heat damage the Burning Goo Puddles are considered to be On Fire with a 1.7m Area Heat Radius. Along with this the Burning Goo Puddles act as an Environmental Heat Source with an Intensity value of 1. To calculate the total heat being applied to any given bug simply use this formula:

Most of the time the amount of additional Heat damage will simply be 2 + 5 * [ Nearby Puddles ]. The Heat Intensity can be raised or lowered in the presence of other Environmental Heat or Cooling effects such as the Blizzards that may occur in the Glacial Strata.

Slowdown Mechanics[]

The two modifications, Protein Disruption Mix and Hydrogen Ion Additive, that affect the Sludge Pump's two sources of slowdown do not add to or replace the slowdown stats. Instead they act as separate multipliers to enemy movement speed.

Movement Speed Multiplier Values
Modifications Corrosion Status Effect Corrosive Puddle Corrosion + Puddle
Base x0.65 x0.55 x0.3575
Protein Disruption Mix x0.4875 x0.275 x0.1341
Hydrogen Ion Additive x0.5525 x0.55 x0.3039
PDM + HIA x0.4144 x0.275 x0.1140

Unique Modifications[]

Unique Modifications
Icon Upgrade Acid
Fluroantimonic Acid
Fluoroantimonic Acid increases the damage of both the Corrosion status effect and the Corrosive Puddles. The extra damage added to the puddles comes in the form of a second damage over time effect with its own tick rate and damage.

Corrosion Bonus:

  • +2 Corrosive damage per tick.

Second Puddle DoT:

  • Damage (per tick): 1 Corrosive damage
  • Tick Rate: 0.2-0.3s

Unique Overclocks[]

Unique Overclocks
Frame Overclock Unstable
Icon Upgrade Special

Goo Bomber Special

Goo Bomber Special is an unstable overclock that causes Charged Shots to drop their Fragments straight down while flying, instead of upon impact. Every Fragment dropped reduces the damage of the main projectile. After every Fragment has been dropped / collide with an entity or the terrain, the main projectile is instantly destroyed.

Frame Overclock Unstable
Icon Upgrade Shotgun Blast

Sludge Blast

Sludge Blast is an overclock that changes the Charged Shot into a shotgun-like blast of the Fragments instead of a larger projectile. Fragments use the Charged Shot's damage instead. Charge Shots are also launched at a 3° angle instead of the normal 9° angle.


Each modification that is purchased advances a mastery bar by one unit.

Mastery unlocks:

  • Three modifications – First Stripe Weapon Paintjob Icon Skin First Stripe
  • Seven modifications – Deepcore Weapon Paintjob Icon Skin Deepcore
  • All modifications – The Company Special Weapon Paintjob Icon Skin The Company Special




  • The Corrosive Sludge Pump's weapon prototype used the Platform Gun model and its goo blobs more closely resembled the goo generated by Goo Sacks.
  • The Corrosive Sludge Pump used to have a Tier 5 modification called "Ingredient X" which, when selected, would dissolve the armor of enemies. This functionality was removed as an modification and added to the base weapon stats upon the release of Season 2, leaving only two Tier 5 modification choices

This page is possibly not up to date.
This page is possibly not up to date. It was last updated for Season 01: Rival Incursion