Difference between revisions of "Acid"

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'''Acid''' is a [[damage type]] that can be reduced by filling as many of your [[armour slot]]s as possible. This protection comes at a price, as every piece of armour worn has a chance of being '''corroded'''.
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'''Acid''' is a [[damage type]] most commonly dealt by [[List of jellies|jellies]] and [[Acid dragon|acidic]] [[Yellow draconian|dragonkind]], which can be resisted with corrosion resistance. Most types of acid damage can apply a temporary corrosion status, which lowers your AC and slaying.
  
 
==Sources of Acid==
 
==Sources of Acid==
Acidic damage can come from several sources.
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Acidic damage can come from several sources, all of which can cause what is known as an "acid splash" (indicated by the message "The acid burns!"). The additional damage from an acid splash is 4d3 from melee-based sources and 4d5 from ranged sources; monsters only receive 2d4 extra damage from melee attacks and are not subject to ranged acid splashes.
  
===Acidic Flesh===
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===Acidic Melee Attacks===
Some monsters have acidic flesh:
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The following monsters have acidic melee attacks, which cause an acid splash and may apply corrosion:
*[[Jelly]]
 
*[[Brown ooze]]
 
*[[Acid blob]]
 
*[[The royal jelly]]
 
*[[Dissolution]]
 
  
Hitting such monsters with a melee weapon (or any wielded piece of armour) has a 30% chance of corroding that weapon. If you are wielding nothing but wearing [[gloves]], your gloves may corrode. If you are completely bare-handed, you will take 1d5 acid damage.  Attacks other than punches (kicks, tail slaps, etc.) will not incur damage or corrosion.
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*{{monsterlink|Jelly}}
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*{{monsterlink|Acid blob}}
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*{{monsterlink|Dissolution}}
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*{{monsterlink|The royal jelly}}
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*{{monsterlink|Caustic shrike}}
  
===Acid Spit===
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===Spit Acid===
The following monsters can spit acid:
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The following monsters can [[Spit Acid]] as a ranged attack, dealing 3d7 acid damage that bypasses AC and may incur both an acid splash and corrosion:
*[[Yellow draconian]]: 3d7
 
*[[Acid blob]] 3d7 (3d9 in [[Zot Defence]])
 
*[[Oklob plant]] 3d7 (3d6)
 
*[[Oklob sapling]] 3d7 (3d3)
 
  
The above damage bypasses AC. The numbers are slightly adjusted when playing the Zot Defence variant. In addition to the above damage, acid spit causes 5 levels of "acid splash" damage (described below) which will harm you and can corrode your armour.
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*{{monsterlink|Acid blob}}
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*{{monsterlink|Acid dragon}}
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*{{monsterlink|Oklob plant}}
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*{{monsterlink|Oklob sapling}}
  
===Acidic Melee Attacks===
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===Acid Splash===
The following monsters have acidic melee attacks:
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Yellow draconians (which occasionally includes [[Tiamat]]) may use the [[Acid Splash]] ability. This is similar to Acid Spit but may splash onto additional creatures adjacent to the target.
*[[Jelly]]
 
*[[Brown ooze]]
 
*[[Acid blob]]
 
*[[Royal jelly]]
 
*[[Dissolution]]
 
  
When struck by these monsters in melee, you will receive 3 levels of acid splash damage in addition to any regular (physical) damage the attack causes.
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*{{monsterlink|Yellow draconian}}
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*{{monsterlink|Tiamat}}
  
===Slime Walls===
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===Acidic Flesh===
Standing next to the [[wall]]s of [[the Slime Pits]] will cause one level of acid splash damage for every level of depth, reaching 6 levels of splash damage on Slime:6. This damage is applied by every wall you are adjacent to: if you are surrounded by walls on Slime:1, you will receive eight separate level 1 splashes. Monsters without acid resistance will receive a flat 2d(level) damage from each wall.
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Some monsters have acidic flesh and will cause acid splashes when attacked with a melee weapon:
  
Worshipers of [[Jiyva]] are unaffected by slime walls.
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*{{monsterlink|Jelly}}
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*{{monsterlink|Acid blob}}
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*{{monsterlink|Dissolution}}
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*{{monsterlink|The royal jelly}}
  
Thankfully, the acid splash from slime walls '''does not corrode items'''. But given how many monsters in the slime pits have corrosive attacks, this is of limited consolation.
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===Corrosive Bolt===
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The spell [[Corrosive Bolt]] deals significant acid damage and may inflict corrosion. Several monsters may cast it, as well as any creature that has picked up a [[wand of acid]].
  
===Acid Splash===
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{{monsters with spell|Corrosive Bolt}}
An acid splash will strike every [[armour slot]] - shield, helmet, body armour, gloves, boots, and cloak - with a chance of corroding each equal to the splash's level * 5%. If you are wearing a [[cloak]], it has a 50% chance of negating a successful corrosion against the helmet, body armour, gloves, and boots slots (each rolled separately). This protection will not harm the cloak, which can only sustain damage when the cloak slot is corroded.
 
  
If you are not wearing armour in a given slot (excepting the shield slot), you will take 1d(splash level) damage (a cloak's 50% negation chance can also protect you from this). The [[Good_mutations#Fur|fur mutation]] ([[troll]]s and [[felid]]s) will reduce this damage by 20% per level of mutation.
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===Acidic Fog===
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Acidic fog is a type of [[cloud]] that deals acid damage to and corrodes anything unfortunate enough to be standing in it. It can only be produced by a high-powered [[wand of clouds]].
  
2d(splash level) damage is then added to the above, meaning a splash can cause anywhere from 2d to 7d damage. Finally, the total damage is reduced by your acid resistance, as shown below.
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===Slime Walls===
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Standing next to the [[wall]]s of [[the Slime Pits]] will subject players and non-jelly or -eyeball monsters to one acid splash per wall tile. Unlike most other types of acid damage, this will never inflict the corrosion status.
  
==Acid Resistance==
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Worshipers of [[Jiyva]] are unaffected by slime walls.  
Acid resistance protects you from any damage that gets past your armour. It is distinct from corrosion resistance, which protects your weapon and armour.
 
  
The sources of acid resistance are:
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==Corrosion Resistance==
*being a yellow [[draconian]]: rAcid+
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Corrosion resistance reduces damage taken from acid and reduces the chance of being further corroded. Also, it gives immunity to [[Cloud#Acidic_fog|clouds of acidic fog]].
*[[Amulet of resist corrosion]]: rAcid+
 
*[[Cloak of preservation]]: rAcid+
 
*[[Tiamat]]'s [[dragonskin cloak]] (50% chance per attack of rAcid+)
 
*Having the [[Good_mutations#Yellow_Scales|yellow scales]] mutation: rAcid+ for level 3.
 
  
The maximum resistance possible is rAcid+++.
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The sources of Corrosion resistance are:
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*being a yellow [[draconian]]
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*[[cloak of preservation]]
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*[[ring of resist corrosion]]
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*[[acid dragon scales]]
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*[[potion of resistance]]
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*[[Tiamat]]'s [[dragonskin cloak]] (50% chance per attack)
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*Having the [[Good_mutations#Yellow_Scales|yellow scales]] mutation at level 3
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*Having at least *** [[piety]] while following [[Jiyva]]
  
 
===Damage Reduction===
 
===Damage Reduction===
{| class="wikitable"
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Players with corrosion resistance take 50% damage from acid. All monsters with any degree of acid resistance are completely immune to acid damage.
! Resistance Level !! Damage Taken (Player) !! Damage Taken (Monster)
 
|-
 
| 1 || 50% || 0%
 
|-
 
| 2 || 34% || 0%
 
|-
 
| 3 || 27% || 0%
 
|}
 
 
 
Any fractional amount remaining is rounded down (if you get hit with 3 points of acid damage and you have rAcid+, you will only take 1 point of damage; if you have rAcid+++, you will take no damage). Acid resistance is effective against acid spit and splashes but does not reduce the damage received when punching an acidic monster.
 
 
 
All monsters with any degree of acid resistance are completely immune to acid damage.
 
  
 
==Corrosion==
 
==Corrosion==
Corrosion can cause items (weapons and armour) to lose a single point of enchantment. Corrosion comes from two sources: striking a monster that has acidic flesh (which only affects your wielded item or gloves), and acid splashes (which affect all worn pieces of armour, but not your weapon). Thankfully, the acidic walls of [[the Slime Pits]] no longer cause corrosion.
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Corrosion is a temporary [[status effect]] which gives a stackable -4 to [[slaying]] and [[AC]] for as long as it lasts. All corrosion will be repaired after enough time has passed. It can also be removed with a [[potion of cancellation]] or by aiming [[Yara's Violent Unravelling]] or your own [[Draconian#Purple|purple draconian]] breath at yourself.
 
 
If an item is corroded, it still has a chance to resist the corrosion based on its enchantment value. The greater the absolute value of an item's enchantment level, the better its odds of resisting. For weapons, corrosion will only affect the weapon's damage enchantment; accuracy bonuses cannot be reduced, but will not defend the weapon.
 
 
 
{| class="prettytable" style="border:none; margin:0; padding:0;"
 
! Enchantment (+ or -) || Resist %
 
|-
 
| 0 || 6%
 
|-
 
| 1 || 18%
 
|-
 
| 2 || 34%
 
|-
 
| 3 || 58%
 
|-
 
| 4 || 98%
 
|-
 
| 5 or more || 100%
 
|}
 
  
On top of that, the resist corrosion intrinsic (found on the [[amulet of resist corrosion]] and the [[cloak of preservation]]) gives you an additional 90% chance to resist corrosion. Dwarven items and [[crystal plate mail]] receive their own 80% resist chance as well.
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In addition to taking acid damage, players may also suffer corrosion from these sources:
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*The [[Entropic Weave]] spell of {{LightCyan|a}} [[File:Entropy weaver.png]] '''[[Entropy weaver]]s'''
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*Taking damage when wearing an [[randart|artefact]] with the '''*Corrode''' property (3% chance per '''*Corrode''').
  
An item's enchantment cannot be reduced to lower than -5 from corrosion, but it is rare for an item to be reduced below -4, since at that level, it has a 98% chance to resist further corrosion.
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Monsters that have been corroded simply get a temporary -8 to their AC. This does not stack -- additional corrosion merely increases the duration.
  
Finally, [[artefact]]s are completely immune to corrosion. When navigating [[the Slime Pits]], a common strategy is to wear a set of whatever artefacts you've found in place of corrodible items. Alternatively, a set of "junk" items can be worn and later discarded; this is preferable to taking extra acid damage by wearing nothing. Similarly, a junk weapon can be employed when engaging early acidic monsters in melee; by the mid-game or later you should have a corrosion-immune weapon.
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==History==
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*Prior to [[0.15]], corrosion instead caused permanent damage to weapons and armor, reducing their enchantment values, possibly into the negatives. Also, [[potions of resistance]] did not grant rAcid or rCorr.
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*There were previously three tiers of acid resistance, each one further reducing acid damage; now there is only one level which is merged with corrosion resistance.
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*In previous versions, acid splashes did more damage if you were wearing less armour (2 dice plus an additional die for each empty armour slot); cloaks provided a 50% chance per empty slot of negating this extra damage, and the damage was reduced by having the [[Shaggy Fur|fur mutation]].
  
 
[[Category:Damage types]]
 
[[Category:Damage types]]

Revision as of 20:28, 14 September 2020

Version 0.25: This article may not be up to date for the latest stable release of Crawl.

Acid is a damage type most commonly dealt by jellies and acidic dragonkind, which can be resisted with corrosion resistance. Most types of acid damage can apply a temporary corrosion status, which lowers your AC and slaying.

Sources of Acid

Acidic damage can come from several sources, all of which can cause what is known as an "acid splash" (indicated by the message "The acid burns!"). The additional damage from an acid splash is 4d3 from melee-based sources and 4d5 from ranged sources; monsters only receive 2d4 extra damage from melee attacks and are not subject to ranged acid splashes.

Acidic Melee Attacks

The following monsters have acidic melee attacks, which cause an acid splash and may apply corrosion:

Spit Acid

The following monsters can Spit Acid as a ranged attack, dealing 3d7 acid damage that bypasses AC and may incur both an acid splash and corrosion:

Acid Splash

Yellow draconians (which occasionally includes Tiamat) may use the Acid Splash ability. This is similar to Acid Spit but may splash onto additional creatures adjacent to the target.

Acidic Flesh

Some monsters have acidic flesh and will cause acid splashes when attacked with a melee weapon:

Corrosive Bolt

The spell Corrosive Bolt deals significant acid damage and may inflict corrosion. Several monsters may cast it, as well as any creature that has picked up a wand of acid.

The following enemies cast Corrosive Bolt:

The following enemies may be able to cast Corrosive Bolt, depending on their spell set:

Acidic Fog

Acidic fog is a type of cloud that deals acid damage to and corrodes anything unfortunate enough to be standing in it. It can only be produced by a high-powered wand of clouds.

Slime Walls

Standing next to the walls of the Slime Pits will subject players and non-jelly or -eyeball monsters to one acid splash per wall tile. Unlike most other types of acid damage, this will never inflict the corrosion status.

Worshipers of Jiyva are unaffected by slime walls.

Corrosion Resistance

Corrosion resistance reduces damage taken from acid and reduces the chance of being further corroded. Also, it gives immunity to clouds of acidic fog.

The sources of Corrosion resistance are:

Damage Reduction

Players with corrosion resistance take 50% damage from acid. All monsters with any degree of acid resistance are completely immune to acid damage.

Corrosion

Corrosion is a temporary status effect which gives a stackable -4 to slaying and AC for as long as it lasts. All corrosion will be repaired after enough time has passed. It can also be removed with a potion of cancellation or by aiming Yara's Violent Unravelling or your own purple draconian breath at yourself.

In addition to taking acid damage, players may also suffer corrosion from these sources:

Monsters that have been corroded simply get a temporary -8 to their AC. This does not stack -- additional corrosion merely increases the duration.

History

  • Prior to 0.15, corrosion instead caused permanent damage to weapons and armor, reducing their enchantment values, possibly into the negatives. Also, potions of resistance did not grant rAcid or rCorr.
  • There were previously three tiers of acid resistance, each one further reducing acid damage; now there is only one level which is merged with corrosion resistance.
  • In previous versions, acid splashes did more damage if you were wearing less armour (2 dice plus an additional die for each empty armour slot); cloaks provided a 50% chance per empty slot of negating this extra damage, and the damage was reduced by having the fur mutation.