Damage/Corrosive Damage

Not to be confused with Corrosive Projection.

Damage is one of the six secondary elemental damage types, composed of and damage. It is immensely useful against most Grineer troops and heavyweight Infested creatures, but fares poorly against the Proto Shields of some Elite Corpus enemies.

Corrosive damage's unique status effect is Corrosion, which permanently degrades the target's current armor by 25%. The damage of the corroding shot is applied after the proc reduces the armor. Corrosion can be applied multiple times to the same target, with each following proc reducing the remaining armor by another 25% of its current (not the initial) value, thereby causing the target's armor to decay at an exponentially decreasing rate. Against Tenno, the status effect lasts for 8 seconds. In the case of shots with multiple pellets (both by default and through multishot mods), multiple stacks of Corrosion can be applied in the same shot. The enemy corroded by the proc will be covered in a green, electricity-like substance.

Corrosive effects do not remove hard invulnerability effects, such as the special protection possessed during the first half of the fight with Lieutenant Lech Kril. Additionally, a few bosses (notably Sargas Ruk), are immune to corrosive (and certain other) proc types.

Type Effectiveness

Health	Modifier	Health	Modifier	Health	Modifier
Cloned Flesh		Flesh		Infested
Ferrite Armor	+75%	Shield		Infested Flesh
Alloy Armor		Proto Shield	–50%	Fossilized	+75%
Machinery		Robotic		Sinew

Corrosive Sources

Weapons

NLCastanas.png

Sancti Castanas (Purity Effect)

SyndicateNLTigris.png

Sancti Tigris (Purity Effect)

GrineerCrossbowGooGun.png

Stug

DETysis.png

Tysis

DjinnMachete.png

Gazal Machete
(Added by Fatal Attraction bursts)

EmbolistScythe.png

Caustacyst

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Mods

†

†Denotes a source of corrosive damage that does not inflict the status effect on enemies.

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Enemies

Tar-Mutalist MOA can launch puddles of tar

Artificer wielding the Stug

Abilities

	4 75	Miasma Releases a poisonous miasma that deals Viral damage to enemies in range. Foes afflicted by spores are more susceptible to the mist. Introduced in Update 7.0 (2013-03-18)	Strength:110 / 125 / 135 / 150 ( Viral damage)
			Duration:6 s
			Range:10 / 12 / 16 / 20 m
			Misc: 100% ( Viral status chance) 4.0x (Spores damage multiplier)

• Info
• Tips & Tricks
• Bugs

Info

• Saryn expends 75 energy to pollutes the environment with a viral mist, briefly  Stunning enemies within 10 / 12 / 16 / 20 meters and sickening them for 6 seconds, dealing 110 / 125 / 135 / 150  Viral damage per second, with 100%  Viral status chance on cast.
  • Cast animation of ~1.5 seconds is affected by Casting Speed.
    • Saryn is immune to crowd control during the cast animation.
  • Miasma cannot stun enemies again if they are still being affected by a previous cast, but will refresh the sickness' duration.
• Ability Synergy: Miasma deals 400% damage to enemies affected by  Spores, and Spored enemies that die while sickened by Miasma will spread Spores.
• Casting Miasma can be done while sliding and in mid-air, but will interrupt any other action and will force Saryn in place for the entire animation.
  • Cannot be used while on a zipline.

Tips & Tricks

• Use  Spores first to start shredding armor (if any), then attack with  Toxic Lash to inflict  Toxin procs on enemies, and follow up with Miasma to deal quadruple damage and a guaranteed  Viral Status Effect proc to increase damage dealt to enemies' health, so  Toxin damage can eat their health up quicker.
• When using  Miasma, be careful to not get knocked down during the cast animation, as once up again, Saryn will automatically repeat the cast animation, during this repeat animation she will take damage as normal, leaving you extremely vulnerable.
• Miasma will not interrupt aim glide. Left/right directional input will be stopped, but the aim glide itself will continue straight as normal.

Bugs

• Casting Miasma immediately after casting either Spores or Toxic Lash will cause Miasma's casting animation to bug, causing the player to be able to move while casting and rapidly cast Miasma.
• Being knocked down during the casting animation causes Saryn to repeat the animation upon standing up.

Multiple Corrosion Procs

Because procs reduce the armor of an enemy by 25% of their current armor, each proc against an enemy removes less armor points than its previous proc, and (if not for rounding) would theoretically never reduce armor to 0. The number of procs it takes to get down to below 1 depends on the initial armor value of the enemy. For the following examples, keep in mind these colored benchmarks:

Damage Reduction = 1 − (300 ÷ (300 + Net Armor))

Armor	Damage Reduction	Benchmark
1260.00	80.77%	Valkyr with Steel Fiber
945.00	75.90%	Atlas with Steel Fiber
735.00	71.01%	Chroma with Steel Fiber
630.00	67.74%	Frost (Prime) with Steel Fiber
600.00	66.00%	Valkyr
577.50	65.81%	Rhino Prime with Steel Fiber
525.00	63.64%	Excalibur Prime with Steel Fiber
472.50	61.17%	Excalibur or Wukong with Steel Fiber
450.00	60.00%	Atlas
399.00	57.08%	Rhino with Steel Fiber
367.50	55.05%	Nezha with Steel Fiber
350.00	53.85%	Chroma
325.50	52.04%	Saryn with Steel Fiber
315.00	51.22%	Oberon or Ash Prime with Steel Fiber
300.00	50.00%	Frost (Prime)
275.00	47.82%	Rhino Prime
262.50	46.67%	Ember Prime with Steel Fiber
250.00	45.45%	Excalibur Prime
225.00	42.86%	Excalibur or Wukong
210.00	41.18%	Ember, Equinox, or Volt Prime with Steel Fiber
190.00	38.78%	Rhino
175.00	36.84%	Nezha
155.00	34.07%	Saryn
150.00	33.00%	Oberon, Ash Prime
136.50	31.27%	Ash, Hydroid, Limbo, Loki (Prime), Mag (Prime), Mesa, Mirage, Nekros, Nova (Prime), or Ivara with Steel Fiber
131.25	30.43%	Nyx Prime or Vauban with Steel Fiber
125.00	29.41%	Ember Prime
100.00	25.00%	Ember, Equinox, or Volt Prime
65.000	17.81%	Ash, Hydroid, Limbo, Loki (Prime), Mag (Prime), Mesa, Mirage, Nekros, Nova (Prime), Ivara
50.000	16.67%	Nyx Prime or Vauban
31.500	09.50%	Banshee, Volt, Nyx, Trinity, or Zephyr with Steel Fiber
15.000	04.76%	Banshee, Volt, Nyx, Trinity or Zephyr

The background colors of the above table mark 10% damage reduction increments. As procs are inflicted against the following hypothetical enemies, they will be brought lower and lower down the rainbow spectrum in damage reduction. The way the remaining armor is calculated is an exponential function as follows:

Remaining Armor = Initial Armor × 0.75^Procs

• Initial Armor is the original armor of your enemy.
• Procs is the number of times that procs occur on the enemy.

Procs on Enemies
Enemy Armor = 100			Enemy Armor = 1000			Enemy Armor = 10000
Procs	Remaining Armor	Damage Reduction	Procs	Remaining Armor	Damage Reduction	Procs	Remaining Armor	Damage Reduction
0	100	25.00%	0	1000	76.92%	0	10000	97.09%
1	75	20.00%	1	750	71.43%	1	7500	96.15%
2	56.25	15.79%	2	562.5	65.22%	2	5625	94.94%
3	42.19	12.33%	3	421.9	58.44%	3	4219	93.36%
4	31.64	09.54%	4	316.4	51.33%	4	3164	91.34%
5	23.73	07.33%	5	237.3	44.17%	5	2373	88.78%
6	17.80	05.60%	6	178.0	37.24%	6	1780	85.58%
7	13.35	04.26%	7	133.5	30.80%	7	1335	81.65%
8	10.01	03.23%	8	100.1	25.02%	8	1001	76.94%
9	7.51	02.44%	9	75.1	20.02%	9	751	71.46%
10	5.63	01.84%	10	56.3	15.80%	10	563	65.24%
—			—			—
13	2.38	00.79%	13	23.8	07.35%	13	238	44.24%
—			—			—
16	1.00	00.33%	16	10.0	03.23%	16	100	25.00%
—			—			—
20	0.31	00.10%	20	3.10	01.02%	20	31.0	09.37%

Were this chart to fill in the gaps and continue, the trend would reveal that every 8 procs reduces the armor value of the current target by almost exactly 90%. This means for players fighting high level Grineer enemies (for reference, a level 120 Heavy Gunner has roughly 10000 armor), procs are nearly essential to kill them, and to get a sufficient number of procs on the enemy, a weapon with both high Status Chance and high Fire Rate would be best.

Complete Armor Depletion

The complete removal of a target's armor occurs when its armor value falls below 1. This may be desirable to remove the damage type modifiers of the target's armor type, or it may be unwanted in the case of Corrosive damage against Ferrite armor, as this means losing the +75% damage bonus. Either way, it is important to consider when this event is expected to occur.

Based on the previous equation describing the relationship between number of procs, initial armor and remaining armor, one can calculate for any given armor value the number of procs required to deplete it completely:

Procs > 8 log₁₀ (Initial Armor)

Conversely, one can calculate for any given number of procs the greatest armor value which it can deplete completely:

Initial Armor < (4/3)^Procs

The bottom line of this for fighting armored targets with Corrosion effects is that, since the number of shots required to deplete the target's armor grows slower with enemy level than the number of shots required to deplete the target's health, armor depletion will occur more often and already at higher relative amounts of health left as enemy level increases, for any fixed weapon setup which can proc Corrosion.

Bugs

Since Update 20.0 (2017-03-24), procs (FX and icon) permanently linger on enemies. This has no effect aside from affecting Condition Overload.

Media

• This Nova is currently using a Corrosive-modded Brakk; Corrosive procs should reduce armor. Notice Kril's Yellow health bar, showing he has armor.
• After proccing the Corrosive effect on Kril several times, his health bar turned red. This suggests that Corrosive procs can reduce armor to zero permanently.

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See Also

• Purity