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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{{version032}}
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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===
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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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*{{Brown|u}} [[File:Ugly thing1.png]] '''Brown [[ugly thing]]s and [[very ugly thing]]s'''
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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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===Acidic Melee Attacks===
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*{{monsterlink|Jelly}}
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The following monsters have acidic melee attacks:
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*{{monsterlink|Acid blob}}
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*[[Spiny worm]]
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*{{monsterlink|Dissolution}}
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*[[Jelly]]
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*{{monsterlink|The royal 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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===Spit Acid===
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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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===Slime Walls===
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*{{monsterlink|Acid blob}}
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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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*{{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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Worshipers of [[Jiyva]] are unaffected by 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. Neither Spit Acid nor Acid Splash ability have the "acid splash" of melee attacks.
  
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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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===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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===Acid Splash===
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{{monsters with spell|Corrosive Bolt}}
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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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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 [[condenser vane]].
  
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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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==Corrosion Resistance==
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Corrosion resistance reduces damage taken from acid and reduces the effect of corrosion. Also, it gives immunity to [[Cloud#Acidic_fog|clouds of acidic fog]].
  
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==Acid Resistance==
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The sources of Corrosion resistance are:
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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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*being a yellow [[draconian]]
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*[[cloak of preservation]]
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The sources of acid resistance are:
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*[[ring of resist corrosion]]
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*[[Amulet of resist corrosion]]: rAcid+
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*[[acid dragon scales]]
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*[[Cloak of preservation]]: rAcid+
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*[[artefact]]s with rCorr
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*[[Tiamat]]'s [[dragonskin cloak]] (50% chance per attack of rAcid+)
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*[[potion of resistance]]
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*Having the [[Good_mutations#Yellow_Scales|yellow scales]] mutation: rAcid+ for level 3.
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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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The maximum resistance possible is rAcid+++.
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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]].
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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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On players, it gives a stackable -4 to damage roll and [[AC]] for its duration. Players with corrosion resistance will only take a -2 penalty per application. All corrosion will be repaired after enough time has passed. It can be immediately removed with a [[potion of cancellation]] or other dispelling effects ([[Yara's Violent Unravelling]], [[Quicksilver Bolt]], or your own [[Draconian#Purple|purple draconian]] breath).
  
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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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*Being adjacent to [[Wall#Slime Covered Rock|slime covered rock]]. (Corrosion will cease as soon as you move away from the wall.)
  
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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 get a temporary -8 to their AC. This does ''not'' stack -- additional corrosion merely increases the duration.
  
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[[Category:Damage types]]
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==History==
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*Prior to [[0.32]], corrosion resistance did not reduce the effect of corrosion. Instead, it had a 50% chance to prevent each application of corrosion.
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*Prior to [[0.30]], slime-covered walls in [[the Slime Pits]] would inflict acid damage.
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*Prior to [[0.28]], Spit Acid, Acid Splash, and Corrosive Bolt caused additional "acid splashes" (extra 4d5 v. the player, 2d4 v. monsters). Their base damage was lower to compensate.
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*Prior to [[0.15]], corrosion instead caused permanent damage to weapons and armour, 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]].

Latest revision as of 23:51, 26 September 2024

Version 0.32: This article is up to date for the latest stable release of Dungeon Crawl Stone Soup.

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. Neither Spit Acid nor Acid Splash ability have the "acid splash" 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.

Corrosion Resistance

Corrosion resistance reduces damage taken from acid and reduces the effect of corrosion. 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.

On players, it gives a stackable -4 to damage roll and AC for its duration. Players with corrosion resistance will only take a -2 penalty per application. All corrosion will be repaired after enough time has passed. It can be immediately removed with a potion of cancellation or other dispelling effects (Yara's Violent Unravelling, Quicksilver Bolt, or your own purple draconian breath).

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

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

History

  • Prior to 0.32, corrosion resistance did not reduce the effect of corrosion. Instead, it had a 50% chance to prevent each application of corrosion.
  • Prior to 0.30, slime-covered walls in the Slime Pits would inflict acid damage.
  • Prior to 0.28, Spit Acid, Acid Splash, and Corrosive Bolt caused additional "acid splashes" (extra 4d5 v. the player, 2d4 v. monsters). Their base damage was lower to compensate.
  • Prior to 0.15, corrosion instead caused permanent damage to weapons and armour, 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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