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==
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Acidic damage can come from several sources.
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===Acidic Melee Attacks===
 +
The following monsters have acidic melee attacks, which may apply corrosion:
  
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===Acidic Flesh===
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*{{monsterlink|Jelly}}
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Some monsters have acidic flesh:
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*{{monsterlink|Acid blob}}
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*[[Jelly]]
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*{{monsterlink|Dissolution}}
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*[[Brown ooze]]
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*{{monsterlink|The royal jelly}}
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*[[Acid blob]]
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*{{monsterlink|Caustic shrike}}
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*[[The royal jelly]]
 
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*[[Dissolution]]
 
  
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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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Acidic melee attacks may cause an "acid splash" (the message "the acid burns!". Players receive 4d3 extra damage, and monsters only receive 2d4 extra damage.
  
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===Acid Spit===
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===Acidic Flesh===
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The following monsters can spit acid:
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Some monsters have acidic flesh and will cause acid splashes when attacked with a melee weapon, like the extra "splash" from the melee attack (4d3 vs players):
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*[[Yellow draconian]]: 3d7
 
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*[[Acid blob]] 3d7 (3d9 in [[Zot Defence]])
 
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*[[Oklob plant]] 3d7 (3d6)
 
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*[[Oklob sapling]] 3d7 (3d3)
 
  
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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|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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===Acidic Melee Attacks===
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===Spit Acid===
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The following monsters have acidic melee attacks:
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The following monsters can [[Spit Acid]] as a ranged attack, dealing 3d14 acid damage that bypasses AC and may incur corrosion:
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*[[Jelly]]
 
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*[[Brown ooze]]
 
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*[[Acid blob]]
 
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*[[Royal jelly]]
 
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*[[Dissolution]]
 
  
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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|Acid blob}}
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*{{monsterlink|Acid dragon}}
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*{{monsterlink|Oklob plant}}
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*{{monsterlink|Oklob sapling}}
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*{{monsterlink|Yellow draconian}}
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*{{monsterlink|Tiamat}}
  
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===Slime Walls===
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Player yellow [[draconian]]s may use the [[Acid Splash]] ability, which is like Spit Acid but can hit surrounding enemies. It does not have the "acid splash" effect of melee attacks.
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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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Worshipers of [[Jiyva]] are unaffected by slime walls.  
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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]].
  
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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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{{monsters with spell|Corrosive Bolt}}
  
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===Acid Splash===
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===Acidic Fog===
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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.
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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 [[condenser vane]].
  
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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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===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.
  
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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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Worshipers of [[Jiyva]] are unaffected by slime walls.
  
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==Acid Resistance==
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==Corrosion Resistance==
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Acid resistance protects you from any damage that gets past your armour. It is distinct from corrosion resistance, which protects your weapon and armour.
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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]].
  
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The sources of acid resistance are:
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The sources of Corrosion resistance are:
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*being a yellow [[draconian]]: rAcid+
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*being a yellow [[draconian]]
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*[[Amulet of resist corrosion]]: rAcid+
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*[[cloak of preservation]]
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*[[Preservation]]: rAcid+
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*[[ring of resist corrosion]]
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*[[Tiamat]]'s [[dragonskin cloak]] (50% chance per attack of rAcid+)
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*[[acid dragon scales]]
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*Having the [[Good_mutations#Yellow_Scales|yellow scales]] mutation: rAcid+ for level 3.
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*[[potion of resistance]]
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*[[Tiamat]]'s [[dragonskin cloak]] (50% chance per attack)
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The maximum resistance possible is rAcid+++.
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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===
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{| 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.
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! Resistance Level !! Damage Taken (Player) !! Damage Taken (Monster)
 
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|-
 
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| 1 || 50% || 0%
 
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|-
 
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| 2 || 34% || 0%
 
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|-
 
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| 3 || 27% || 0%
 
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|}
 
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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.
 
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All monsters with any degree of acid resistance are completely immune to acid damage.
 
  
 
==Corrosion==
 
==Corrosion==
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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 damage roll and [[AC]] for as long as it lasts. Players with corrosion resistance will resist 50% of corrosion attempts. All corrosion will be repaired after enough time has passed.  
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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.
 
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{| class="prettytable" style="border:none; margin:0; padding:0;"
 
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! Enchantment (+ or -) || Resist %
 
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|-
 
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| 0 || 6%
 
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|-
 
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| 1 || 18%
 
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|-
 
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| 2 || 34%
 
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|-
 
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| 3 || 58%
 
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|-
 
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| 4 || 98%
 
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|-
 
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| 5 or more || 100%
 
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|}
 
  
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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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It can be immediately removed with a [[potion of cancellation]]; aiming [[Yara's Violent Unravelling]], a [[wand of quicksilver]], or your own [[Draconian#Purple|purple draconian]] breath at yourself are more painful, yet perhaps more accessible, ways of removing corrosion.
  
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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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In addition to acid damage, players may also suffer corrosion from these sources:
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*Being hit by enemies with [[:Category:Corrode flavour|corrosive attacks]] (like the {{monsterlink|Rust devil}}).
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*The [[Entropic Weave]] spell of {{LightCyan|B}} [[File:Entropy weaver.png]] '''[[Entropy weaver]]s''' or {{LightGreen|6}} [[File:Demonspawn corrupter.png]] '''[[Demonspawn corrupter]]s'''
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*Taking damage while wearing an [[randart|artefact]] with the '''*Corrode''' property (3% chance per '''*Corrode''').
  
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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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Monsters that have been corroded simply get a temporary -8 to their AC. This does not stack -- additional corrosion merely increases the duration.
  
 
==History==
 
==History==
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In [[0.15]], corrosion will be drastically overhauled. Instead of a successful corrosion attack causing your equipment to be permanently damaged, it will instead give you the temporary corrosion [[status effect]]. This gives you a temporary -3 [[slaying]] modifier and -5 to [[AC]] for as long as it lasts, and can be stacked to multiply the effect. This makes corrosion less aggravating in the long-term, but much more life-threatening during an actual fight. Corrosion will be repaired after enough turns have passed.
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*Prior to [[0.28]], separately damaging acid splashes happened with Spit Acid and Acid Splash abilities; their damage was increased from 3d7 to compensate.
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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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Also, [[potions of resistance]] will grant rAcid and 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]].
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[[Category:Crystal Ball Articles]]
 
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[[Category:Damage types]]
 

Revision as of 23:05, 1 January 2023

Version 0.29: 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 Melee Attacks

The following monsters have acidic melee attacks, which may apply corrosion:

Acidic melee attacks may cause an "acid splash" (the message "the acid burns!". Players receive 4d3 extra damage, and monsters only receive 2d4 extra damage.

Acidic Flesh

Some monsters have acidic flesh and will cause acid splashes when attacked with a melee weapon, like the extra "splash" from the melee attack (4d3 vs players):

Spit Acid

The following monsters can Spit Acid as a ranged attack, dealing 3d14 acid damage that bypasses AC and may incur corrosion:

Player yellow draconians may use the Acid Splash ability, which is like Spit Acid but can hit surrounding enemies. It does not have the "acid splash" effect of melee attacks.

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 condenser vane.

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 damage roll and AC for as long as it lasts. Players with corrosion resistance will resist 50% of corrosion attempts. All corrosion will be repaired after enough time has passed.

It can be immediately removed with a potion of cancellation; aiming Yara's Violent Unravelling, a wand of quicksilver, or your own purple draconian breath at yourself are more painful, yet perhaps more accessible, ways of removing corrosion.

In addition to 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 0.28, separately damaging acid splashes happened with Spit Acid and Acid Splash abilities; their damage was increased from 3d7 to compensate.
  • 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.
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