Corrosive Sludge Pump

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## Equipment Details

### Availability

Unlock

Purchased for:

 — 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.

## Modifications

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

## Overclocks

Overclock calculations happen after modifiers.

## 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.

 Base
 Protein Disruption Mix
 Hydrogen Ion Additive
 PDM + HIA

### Unique Modifications

* +2 Corrosive damage per tick.

Second Puddle DoT:
* Damage (per tick): 1 Corrosive damage
* Tick Rate: 0.2-0.3s

### Unique Overclocks

**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.

## 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

## 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.
* 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