Corrosive Damage

Damage is one of the six secondary elemental damage types, composed of and damage. It is immensely useful against Ferrite Armor and Fossilized creatures, but fares poorly against the Proto Shields of some elite enemies.

Status Effects

damage's status effect is Corrosion, which permanently degrades the target's current armor (either Ferrite or Alloy) by 25%. The damage of the corroding shot is applied before 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, especially with weapons that fire multiple pellets (both by default and through Multishot mods). Against Tenno, the armor degrade is temporary and lasts for 8 seconds.

The enemy corroded by the proc will be covered in a green, electricity-like substance. The status effect FX is permanent, allowing the enemies which have been affected by at least one proc to be identified.

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

As with all damage types effective against armor,  damage's type modifier works in two ways: it ignores a percentage of the target's armor, and increases the damage dealt in the same way as a type modifier against hitpoints. Practically speaking, this means that  damage is only reduced by 25% of a target's whole Ferrite Armor and the base damage is increased by +75%.

Corrosive Sources

Weapons

NLCastanas.png

 Sancti Castanas (Purity Effect)

SyndicateNLTigris.png

 Sancti Tigris (Purity Effect)

PriestSpearGun.png

 Scourge

GrineerCrossbowGooGun.png

 Stug

U10InfPrimary.png

 Synapse

DETysis.png

 Tysis

DjinnMachete.png

 Gazal Machete
(Added by  Fatal Attraction bursts)

EmbolistScythe.png

 Caustacyst

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Mods

• Weapons
• Warframe

†

†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

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Abilities

• Inaros
• Saryn

	4 100	Scarab Swarm Summon a Scarab Swarm to attack enemies with guaranteed Corrosion Status. Damage scales with Inaros' Health. Enemies killed while immersed in the swarm summon a Swarm Kavat that fights alongside Inaros and guides the scarabs to other enemies. Introduced in Update 18.5 (2016-03-04)	Strength:N/A
			Duration:6 / 10 / 12 / 15 s (swarm duration)
			Range:20 / 22 / 25 / 30 m (cast range) ? / ? / ? / 12 m (spread range)
			Misc: ? number of swarms ? / ? / ? / 241 ( Corrosive damage/sec) 10% (bonus damage from max health)  Corrosive status per tick 0.5 s damage tick interval ? s swarm spread interval 100% (spread remaining duration) 3 (Swarm Kavat limit) ? s Swarm Kavat lifespan

• Info
• Augment
• Tips & Tricks

Info

• Inaros expends 100 energy to hurl ? swarms of scarabs that travel up to 20 / 22 / 25 / 30 meters away, infesting all enemies in their path. Swarmed enemies will flail in panic and receive ? / ? / ? / 241 plus 10% of Inaros' max health as  Corrosive damage with a guaranteed status effect per 0.5~ seconds for 6 / 10 / 12 / 15 seconds, during which they are completely disabled. While active, Scarab Swarm splits a flying swarm every ? seconds to spread to an unaffected enemy within a ? / ? / ? / 12 meter radius from a swarm host for 100% of its remaining duration.
  • Launching a Scarab Swarm on an enemy that is still under the effects of another Scarab Swarm, will not refresh the debuff.
  • Scarab Swarm's projectile possesses innate punch through but does not bypass obstacles in the environment.
• When an enemy affected by Scarab Swarm dies, they spawn a friendly Swarm Kavat that scratches enemies to spread Scarab Swarm. A maximum of 3 Swarm Kavats can spawn, each lasting 20 seconds.
  • Number of active Swarm Kavats are tracked as a buff icon beside Inaros' hitpoints indicator.
  • Swarm Kavat-inflicted Scarab Swarm does not spread flying swarms.
• Ability Synergy: Swarm Kavat claw swipes contribute as hits toward Inaros' revival via his Passive.

Augment

Main article: Negation Armor

Negation Armor is a Warframe Augment Mod for  Inaros that sacrifices an active  Scarab Shell to prevent Inaros from entering Bleedout, but receives a  Slash status effect once its invulnerability period expires.

Rank	?	Cost
0	?	6
1	?	7
2	?	8
3	?	9

Tips & Tricks

• It is more energy efficient to cast a Scarab Swarm attack on a single enemy in the middle of a large, clustered group, and allowing the swarm spreading effect to infect all nearby enemies. This is particularly effective against Infested that naturally tend to clump together in groups.

	1 25	Spores Inflict a target with a pox of Corrosive spores. Spread spores to nearby enemies by destroying them or killing their host. The longer the Spore spreads, its damage will increase. Introduced in Update 7.0 (2013-03-18)	Strength:6 / 8 / 8 / 10 (initial damage) 1 / 1.25 / 1.5 / 2 (damage growth per enemy) 50% ( Corrosive status chance) 20% (reset decay)
			Duration:10% (damage decay rate)
			Range:30 / 40 / 50 / 60 m (cast range) 10 / 12 / 14 / 16 m (spread radius)
			Misc: ∞ (duration) 7 (damage growth enemy cap) 0.5 s (damage decay interval) 2 / 2 / 3 / 3 (initial spores) 1 (transmitted spore) 3 (max spores per enemy via spread) 12 (max spores per enemy via recast) 4.0x (miasma damage multiplier)

• Info
• Augment
• Tips & Tricks

Info

• Saryn expends 25 energy to infects an enemy target within 30 / 40 / 50 / 60 meters with 2 / 2 / 3 / 3 virulent spores for an infinite duration. Each individual spore inflicts  Corrosive damage per second with a 50%  Corrosive Status Chance, lasting until the spores themselves or the infected enemy is destroyed.
• Saryn's disease spreads its infection rapidly, grows evermore lethal, and decays in the absence of hosts over the course of the epidemic:

• Spread
• Growth
• Decay

• Shooting or hitting a spore directly bursts its membrane to release infectious pus, which regrows the spore on its host and transmits 1 spore to all nearby enemies within 10 / 12 / 14 / 16 meters; infected enemies can carry up to 3 spores via transmission from another enemy.
  • Spores can spread by directly bursting them with weapons, abilities, and Bullet Jump. Enemy attacks can also burst spores on contact.
  • Spread bypasses obstacles in the environment and damage does not diminish with distance.
• All spores on an infected enemy will burst and spread if any of the following conditions are met:
  • Spores' initial target is killed by any source.
  • Players landing the killing blow on any infected enemies.
  • Infected enemies are killed by  Molt's explosion damage.
  • Saryn's weapons hitting anywhere on the infected enemies' body while  Toxic Lash is active.
  • Infected enemies are killed by any source while sickened by  Miasma.
• Spores do not spread if enemies infected via transmission are killed by Spores' damage over time.

When the outbreak first begins, damage per second starts at 6 / 8 / 8 / 10  Corrosive damage; for every second Spores remain active, damage per second increases by 1 / 1.25 / 1.5 / 2  Corrosive damage per infected enemy, up to a damage growth cap of 7 infected enemies. Current damage per second is uniform across all active spores and will apply to newly infected enemies.

• Current damage per second is hard-capped at 100,000 damage.

While Spores is active, a stylized infection meter appears above Saryn's ability icons on the HUD, indicating the current damage per second and tracks the number of infected enemies in the mission affected by spores belonging to the player.

When zero infected enemies remain, Spores' current damage per second is instantly reduced by 20% then decays at 10% of the new total every half second until it reaches the initial damage amount. Damage decay stops when at least one enemy is infected by Spores.

• Nullifying effects (such as entering Sanctuary Onslaught Data-Conduits) increases the decay rate to 30% per half second.
• Reset decay is inversely affected by  Ability Strength, meaning more Strength reduces the amount consumed.
• Damage decay rate is inversely affected by  Ability Duration, meaning more Duration reduces the amount of damage decay per half second.

Current damage per second is visibly subtracted from the meter whilst a red flashing "decaying" warning message replaces the counter for number of infected enemies.

The infection meter disappears when it reaches the initial damage amount.

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• If Spores is still active, recasting Spores on any enemy consumes 20% of current damage per second from the infection meter and casts Spores for 50% reduced energy cost. Recasting on an infected enemy grows a new set of spores on the target, which carries up to 12 spores via recasting Spores on it.
  • Recast decay is inversely affected by  Ability Strength, meaning more Strength reduces the amount consumed.
• All spores destroyed via melee weapon contribute to the melee combo counter.
• Each instance of Spores has its own Ability Strength value from when it was casted, and be independent from other instances.
  • For example, if an instance of Spores is casted when  Energy Conversion is activated, that instance will retain Status chance and Damage Growth with Ability Strength bonus.
  • If another instance of Spores is casted, when there is no bonus, the second instance will have lower Status chance and Damage Growth, even while the first instance from above is still active.
  • All spores share the same accumulated damage per second, though each instance could contribute Damage Growth at different rate.
  • When Spores spread to other enemies, the subsequent instances will retain Status chance and Damage Growth from their original instance. Strong instance spreads strong instances, and vice versa.
  • Spores being carried by enemies will not be replaced by another spore via transmission.
  • If an enemy is carrying spores from multiple instances with different Strength values, damage per second will be contributed by the instance with the highest Damage Growth.
• Ability Synergy:
  •  Toxic Lash can make spores burst with every attack, even without direct hits.
    • Hitting a spore while Toxic Lash is active applies an additional  Toxin proc.
  •  Miasma deals 400% damage to enemies affected by Spores.
• Spores is a one-handed action. As such, it can be used while performing various maneuvers and actions without interruption.
• If the initial target dies before the spores appear, energy used for Spores will be refunded.

Augment

Main article: Revealing Spores

Revealing Spores is an Exilus Warframe Augment Mod for  Saryn's  Spores that causes enemies affected the ability to show up on the mini map.

Revealing Spores

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Main article: Venom Dose

Venom Dose is a Warframe Augment Mod for  Saryn that allows  Spores to be held on cast, creating a wave of energy traveling outward from the user that temporarily grants the caster and nearby allies additional  Corrosive damage to all attacks.

Venom Dose

Tips & Tricks

• Cast on an enemy in the middle of a crowd and promptly kill it or use one of the many methods to spread the spores.
• Each spore inflicts damage per second and  Corrosive status effect on proc, which is tripled on an enemy carrying three spores from a max rank Spores cast or accumulated from transmission from other infected enemies.
• Infect at least 7 enemies to maximize damage growth, allowing Spores to reach higher damage per second counts over time.
• Mod for Ability Strength to increase initial damage, damage growth per enemy, status chance, while reducing the reset decay on recast or on zero infected present.
  • Status chance can reach 100% with 200% Ability Strength.
• Recast Spores several times to inflict an enemy with up to 12 spores to strip its Armor quickly, deal more damage per second instances, and provide more spores to spread.
  • However, note that each recast will consume a percentage of damage per second stored in your infection meter.
• Using melee to hit enemies makes it easier to burst spores, compared to firearms, especially with Range mods, e.g.  Reach ( Primed).
• Use  Toxic Lash to spread spores on an infected enemy on every hit using your gun or melee.
• Cast  Miasma to inflict quadruple damage to all enemies infected by Spores within range.
• Can be used to destroy Corpus cameras and (active) turrets. A spore will appear but a camera dies on the first tick.
• When combined with AoE weapons (such as  Ignis and  Embolist, which both deal DoT, increased by Saryn's passive), the spores will pop very easily, quickly spreading  Corrosive procs.
  • Thrown secondaries loaded with  Concealed Explosives are also effective and economical at quickly popping Spores, especially when combined with  Fulmination ( Primed).
• The ability synergizes well with Nova's  Molecular Prime, both spreading and weakening enemies until one dies and causes a series of chain explosions and effectively quartering enemy survivability.
• Spores is excellent for bosses with shields to prevent them from recovering.
  • This is quite effective against Ambulas since it targets the torso and, like all MOAs, he takes three times damage on that body part.
• Sentinels can also pop Spores.
  • Equipping a sentinel with the  Sweeper weapon increases this chance.
• Spores that are popped on a target's weak point, like the head, will do extra damage based on the respective damage multiplier.
  • For example, if you pop a Spore on an enemy's head, it will deal 50 damage (25 x 2 damage multiplier).
  • Spores' DoT ticks are unaffected by weak spots.
  • AoE damage from popping spores is unaffected by weak spots. Nearby enemies will still only take 25  Corrosive damage from popped spores on weak spots.
• A Range-based Spores build is good for earning Focus points in stage-less endless missions such as Survival, Disruption and Void Flood, as long as Saryn can keep it from decaying.
• Active spores can help fill the self-revive gauge from the  Unairu school's Last Gasp.

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 (Umbra) with Steel Fiber
472.50	61.17%	Excalibur or  Wukong with Steel Fiber
450.00	60.00%	Atlas
420.00	58.33%	Inaros with Steel Fiber
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,  Nidus, or  Ash (Prime) with Steel Fiber
300.00	50.00%	Frost (Prime)
275.00	47.82%	Khora, Rhino Prime
262.50	46.67%	Ember Prime or  Gara with Steel Fiber
250.00	45.45%	Excalibur Prime (Umbra)
225.00	42.86%	Excalibur, Oberon Prime, or  Wukong
210.00	41.18%	Ember,  Equinox, or  Volt Prime with Steel Fiber
200.00	40.00%	Inaros
190.00	38.78%	Rhino
175.00	36.84%	Nezha
155.00	34.07%	Saryn
150.00	33.00%	Oberon, Ash Prime, or  Nidus
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 or  Gara
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 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