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 Unlocked through an assignment
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Requires Driller  20
Purchased for:
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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 an 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.
Modifications[]
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 | ||||||||||||
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| Mod | Effect | In Game Description | Price | |||||||||
| Tier 1 |  High Capacity Tanks |
+20 Tank Size | "The good thing about clips, magazines, ammo drums, fuel tanks ...you can always get bigger variants." |
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 Better Air Pressurizer |
+40% Projectile Velocity | "The air pressurizer is improved, making the projectiles travel faster and further." |
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 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." |
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| Tier 2 |  Dyse Nozzle |
+24 Charged Splash Damage | "With the Dyse Nozzle your charged shot is launched with more force, making it damaging on impact." |
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Atomizer Nozzle |
+4 Charged Fragment Count | "With the Atomizer Nozzle your charged shot will leave behind more fragments on impact." |
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 Potent Goo Mix |
+8 Normal Shot Damage | "Normal shots do more damage on impact." |
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| Tier 3 |  Supersaturation |
+2 Effects Duration, +6 Puddle Lifespan | "The goo goes through a process of supersaturation after impact, making the effects and puddles last longer." |
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 More Goo Canisters |
+40 Max Ammo | "You had to give up some sandwich-storage, but your total ammo capacity is increased!" |
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| Tier 4 |  Spillback Extension |
-1 Charge Cost | "With the Spillback Extension added to the nozzle you spend less goo when charging." |
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 Improved Spooling Mechanism |
-60% Charge Time | "The spooling mechanism has been improved and can get you to a full charge faster!" |
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| Tier 5 |  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." |
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 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!" |
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Overclocks[]
Overclock calculations happen after modifiers.
 Corrosive Sludge Pump [Expand/Collapse]
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| Overclock | Effect | In Game Description | Price | ||||||||
Hydrogen Ion Additive
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 +0.5 Direct Hit Corrosive Damage
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"Experimental additive that activates on impact gives a small improvement to the corrosive DoT and slowdown effect of direct hits." |
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AG Mixture
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"Anti-gravity pellets suspended in the sludge let the projectiles fly further and faster." |
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Volatile Impact Mixture
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"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." |
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Disperser Compound
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"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." |
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Goo Bomber Special
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"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." |
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Sludge Blast
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"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." |
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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:
- Heat per Second = [ Current Intensity Temperature per Second ] + 5 * [ Nearby Puddles ]
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.
| Modifications | Corrosion Status Effect | Corrosive Puddle | Corrosion + Puddle |
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| 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[]
Fluoroantimonic 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[]
Goo Bomber Special[]
Charged Shots now 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, the main projectile is destroyed.
Sludge Blast[]
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.
Mastery[]
Each modification that is purchased advances a mastery bar by one unit.
Mastery unlocks:
- Three modifications – First Stripe Weapon Paintjob
- Seven modifications – Deepcore Weapon Paintjob
- All modifications – The Company Special Weapon Paintjob
Skins[]
Gallery[]
Trivia[]
- 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.
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