Difference between revisions of "Poison"

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''This page is about the effect. For the spell school and skill see [[Poison Magic]].''
  
 
'''Poison''' is one of the most common elemental forces you will encounter as you explore the [[Dungeon]]. Both players and monsters can take advantage of poison through spells or specially [[brand]]ed weapons, though it is most commonly encountered in the form of the stings and bites of poisonous monsters.
 
'''Poison''' is one of the most common elemental forces you will encounter as you explore the [[Dungeon]]. Both players and monsters can take advantage of poison through spells or specially [[brand]]ed weapons, though it is most commonly encountered in the form of the stings and bites of poisonous monsters.
  
 
==Poison Damage==
 
==Poison Damage==
Generally, poison damage occurs over time whenever something suffers from the Poison condition (indicated by the word Pois on your status). The duration of this condition and the amount of damage it deals per turn is somewhat randomized, but depends heavily upon the severity of the poison. This is displayed by the color of the word "Pois" in your status: yellow lettering means mild poison, pink is medium, and red is severe. Be cautious in areas with poisonous monsters, as the poison condition can be stacked; getting hit multiple times from a poisonous enemy can result in severe poisoning if you're careless.
+
Generally, poison damage occurs over time whenever something suffers from the Poison condition (indicated by the word Pois on your status, and by yellow highlighting on your health bar). The duration of this condition and the amount of damage it deals per turn depends heavily upon the severity of the poison. This is displayed by the color of the word "Pois" in your status: yellow lettering means mild poison, pink is medium, and red is severe. In addition, part of your health bar will turn yellow to indicate the total damage that the poison will eventually do. Be cautious in areas with poisonous monsters, as the poison condition can be stacked; getting hit multiple times from a poisonous enemy can result in severe poisoning if you're careless.
  
 
While even low-level characters can usually survive mild poisoning, severe cases can deal tremendous amounts of damage over time. In any case, it is almost always best to rest and avoid combat until the poison has run its course, perhaps on a cleared floor to avoid wandering monsters.
 
While even low-level characters can usually survive mild poisoning, severe cases can deal tremendous amounts of damage over time. In any case, it is almost always best to rest and avoid combat until the poison has run its course, perhaps on a cleared floor to avoid wandering monsters.
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==Poison Sources==
 
==Poison Sources==
It is relatively easy for characters to gain access to sources of poison damage. Characters who specialize in weapons that strike quickly can benefit from [[venom]]-branded weapons, which inflict the poison condition on top of their normal physical damage. Ranged weapon-users can instead use [[poisoned]] missiles, which function identically. Both of these effects are stackable for more lethal results. The [[staff of poison]] and [[staff of Olgreb]] have a poisonous melee attack that is dependent on your skill in [[Poison Magic]] and that can potentially affect poison-resistant creatures.
+
It is relatively easy for characters to gain access to sources of poison damage. Characters who specialize in weapons that strike quickly can benefit from [[venom]]-branded weapons, which inflict the poison condition on top of their normal physical damage. The [[staff of poison]] and [[staff of Olgreb]] have a poisonous melee attack that is dependent on your skill in [[Poison Magic]] and [[Evocations]]. [[Poisoned]] darts can be [[Throw]]n for a ranged poison attack.
  
The Poison Magic school is also available to [[venom mage]]s or any character with [[Spellcasting]] capabilities and an appropriate [[book]]. This school is devoted almost entirely to dealing poison damage, though it also contains some spells for inflicting [[confusion]] and a handy poison remedy for yourself.
+
The Poison Magic school is also available to [[venom mage]]s or any character with [[Spellcasting]] capabilities and an appropriate [[book]]. This school is devoted almost entirely to dealing poison damage, though it also contains some spells for inflicting [[confusion]].
  
 
[[Naga]]s have an innate [[Spit Poison]] ability which inflicts significant physical and poison damage.
 
[[Naga]]s have an innate [[Spit Poison]] ability which inflicts significant physical and poison damage.
  
Characters can also be poisoned in a number of unorthodox ways. Characters [[quaff]]ing unidentified [[potions]] may accidentally drink a [[potion of poison]] or [[potion of strong poison]]. [[Needle trap]]s and [[pressure plate]]s may inflict the condition, as will being affected by [[miasma]]. Especially suicidal characters may also acquire it by eating poisonous [[chunk]]s, though there is really no reason to do this.
+
[[Needle trap]]s may inflict the condition, as will being affected by [[miasma]].
 
 
Worshipers of [[the Shining One]] should avoid inflicting poison, as he is offended by such dishonorable tactics.
 
  
 
==Poison Types==
 
==Poison Types==
There are four types of poison: regular, medium, strong, and nasty.
+
Monsters can have two types of poison attacks: normal and strong poison. Both have a 1/3 chance to trigger on each hit.
  
*Regular poison has a 25% chance of giving the defender one level of poison on a successful attack (5% if the attack does less than 2 points of damage).
+
*Normal poison will poison the player for a random amount between 2 and 4 times the monster's [[HD]]
*Medium poison has a 33% chance of poisoning the defender (7% if the attack did less than 2 points of damage) for 1d3 levels of poison.
+
*Strong poison will instead poison for 3.67-6.5 times the monster's HD
*Strong poison has a 33% chance of poisoning the defender (7% if the attack did less than 2 points of damage) for 2d5+1 levels of poison.  If the defender is [[natural]] or a [[plants|plant]] and has 1 or 2 levels of poison resistance, it will take 1d3 levels of poison.
 
*Nasty poison always imparts 2 levels of poison to any creatures that are not immune (3+ levels of resistance).
 
*[[Spiny worm]]s have a special attack which is both [[acid]]ic and poisonous; the poison portion of it always imparts 1d4+1 levels of poison to any creatures that are not immune.
 
  
Monsters receive half the above levels of poison, rounded down (but never less than 1).
+
Poison-branded weapons have a 3 in 4 chance to trigger, and do not depend on HD. Instead, they add poison damage equal to 6-13 plus a random amount from 0 to 1.5x the damage done.
  
 
==Poison Resistance==
 
==Poison Resistance==
In [[0.10]], poison resistance was changed to have multiple levels, although this is not reflected on the player's resistances overview. Any level of resistance confers immunity to [[Poisonous Cloud|Poisonous]] and [[Mephitic Cloud|Mephitic]] Cloud, and gives players a 90% chance of shrugging off each level of poison at the time that it is applied.  Three levels of poison resistance makes one impervious to the "poisoned" [[condition]], although poison damage is only partly reduced ([[#Damage Reduction|see below]]) and many poison attacks have a physical component as well.
+
Players and monsters can have a single level of rPois or, less commonly, complete immunity (which is represented as three levels of resistance in the game's code). Having multiple sources of poison resistance is no more effective than having a single one, though: an [[Octopode]] can't wear three rings to become immune.
 
 
Monsters with three levels of poison resistance are immune to all sources of poison damage and the poison condition.  Monsters with one or two levels of resistance can potentially still become poisoned by strong or nasty poison.
 
  
As an added benefit, poison resistance allows you to treat poisoned chunks as clean, and poisoned+contaminated chunks as contaminated.
+
Resistance confers immunity to [[Mephitic Cloud]] and [[Alistair's Intoxication]], and gives a 2 in 3 chance of shrugging off poison at the time that it is applied. Complete immunity makes one impervious to the "poisoned" [[condition]], although poison damage is only partly reduced ([[#Damage Reduction|see below]]) and many poison attacks have a physical component as well.
  
 
You can acquire poison resistance from a number of sources:
 
You can acquire poison resistance from a number of sources:
 
*[[Good mutations#Poison Resistance|Poison Resistance]] [[mutation]]
 
*[[Good mutations#Poison Resistance|Poison Resistance]] [[mutation]]
 
*The third rank of the [[Good mutations#Slimy Green Scales|Slimy Green Scales]]
 
*The third rank of the [[Good mutations#Slimy Green Scales|Slimy Green Scales]]
*[[Swamp dragon hide]] and [[swamp dragon armour]]
+
*[[Swamp dragon scales]]
*[[Gold dragon hide]] and [[gold dragon armour]]
+
*[[Gold dragon scales]]
 
*Armour of [[ego|poison resistance]]
 
*Armour of [[ego|poison resistance]]
*[[Staff of poison]] or [[staff of Olgreb]]
+
*[[Staff of poison]]
 
*[[Ring of poison resistance]]
 
*[[Ring of poison resistance]]
 
*[[Tiamat]]'s [[dragonskin cloak]] (50% chance per attack)
 
*[[Tiamat]]'s [[dragonskin cloak]] (50% chance per attack)
 
*[[Randart]]s
 
*[[Randart]]s
 
*[[Potion of resistance]]
 
*[[Potion of resistance]]
 +
*[[Tree form]] from a [[potion of lignification]]
 
*[[Ice Form]] or [[Dragon Form]]
 
*[[Ice Form]] or [[Dragon Form]]
*Being a [[naga]], green [[draconian]], or thirsty [[vampire]] (these [[species]] all have poison resistance)
+
*Being a [[naga]] or green [[draconian]]
*Being undead ([[mummy]], [[ghoul]], bloodless [[vampire]], or through [[Necromutation]]) or artificial ([[gargoyle]] or through [[Statue Form]]) renders you completely immune to poison.
+
 
*[[Zin]]'s Vitalisation ability prevents the [[status effect]], but you can't eat poisoned chunks and you still take full damage from sources of direct poison damage like [[Poison Arrow]] or [[Poisonous Cloud]]. However, it does grant resistance to [[Venom Bolt]] and [[Sting]].
+
Additionally, there are a few ways to become totally immune:
*[[Deep dwarf]] damage shaving affects damage from poison, and may effectively negate all but the most severe poison conditions
+
*Being an undead race ([[mummy]], [[ghoul]], or bloodless [[vampire]])
*[[Healing]] yourself through other means will NOT cure the condition, but may give you the HP you need to wait it out.
+
*Being a [[gargoyle]]
 +
*Casting [[Necromutation]] or [[Statue Form]] renders you temporarily immune to poison. Poison won't count down during these transformations, however, so if you cast them while poisoned you'll be just as poisoned when they end.
 +
*Wielding the [[Staff of Olgreb]]. Unlike the transmutations above, the poison status will count down (harmlessly) while you wield it.
 +
 
 +
Some things other than resistance can help against poison as well:
 +
*[[Zin]]'s Vitalisation ability prevents the [[status effect]], but you still take full damage from sources of direct poison damage like [[Poison Arrow]] or [[Poisonous Cloud]]. However, it does grant resistance to [[Venom Bolt]] and [[Sting]].
 +
*[[Deep dwarf]] damage shaving affects damage from poison, and will completely negate up to 25 points of poison damage.
 +
*[[Healing]] yourself through other means will ''not'' cure the condition, but may give you the HP you need to wait it out.
  
 
===Poison Vulnerability===
 
===Poison Vulnerability===
Some monsters (particularly insects and spiders – and you, in [[Spider Form]]) are vulnerable to poison, taking twice as much damage from poison attacks, and doubling the number of poison levels received.
+
Some monsters (particularly insects and spiders – and you, in [[Spider Form]]) are vulnerable to poison, taking twice as much damage from poison attacks, and doubling the amount of poisoning received.
  
 
===Damage Reduction===
 
===Damage Reduction===
 +
 +
*[[Sting]] and [[Venom Bolt]]
 
{| class="wikitable"
 
{| class="wikitable"
 
! Resistance Level !! Damage Taken (Player) !! Damage Taken (Monster)
 
! Resistance Level !! Damage Taken (Player) !! Damage Taken (Monster)
|-
+
|-
| 1 || 50%* || 50%
+
| -1 || 100% || 150%
|-
+
|- 
| 2 || 33%* || 20%
+
| 0 || 100% || 100%
|-
+
|- 
| 3 || 20% || 0%
+
| 1 || 100% or 50%<ref>100% if it inflicts a dose of poison despite poison resistance. 50% otherwise.</ref> || 50%
 +
|-
 +
| 2 || - || 20%
 +
|-
 +
| 3 || 50% || 0%
 
|}
 
|}
  
<nowiki>*</nowiki>: [[Sting]] and [[Venom Bolt]] ignores the two first levels of poison resistance one of every ten times (when it poisons you).
+
*[[Poison Arrow]]
 
+
{| class="wikitable"
Note: [[Poison Arrow]] deals some irresistible damage (30%).
+
! Resistance Level !! Damage Taken (Player) !! Damage Taken (Monster)
 +
|- 
 +
| -1 || 135% || 135%
 +
|- 
 +
| 0 || 100% || 100%
 +
|- 
 +
| 1 || 65% || 65%
 +
|- 
 +
| 2 || - || 44%
 +
|-     
 +
| 3 || 44% || 30%
 +
|}
  
 
==Curing Poison==
 
==Curing Poison==
 
Characters that lack poison resistance can still avoid the worst of its effects by curing the condition before it runs its course. The following options are available:
 
Characters that lack poison resistance can still avoid the worst of its effects by curing the condition before it runs its course. The following options are available:
 
*[[Quaff]]ing a [[potion of curing]].
 
*[[Quaff]]ing a [[potion of curing]].
*[[Cure Poison]]
 
 
*[[Elyvilon]]'s Purification ability
 
*[[Elyvilon]]'s Purification ability
  
 
==Poisoned Condition==
 
==Poisoned Condition==
Poison attacks frequently result in a monster or player having the "poisoned" [[condition]]. While poisoned, a creature will take an amount of damage proportional to the degree to which it is poisoned. Each dose of poison "stacks" with previous ones, up to a maximum of 40 levels of poison for players. Different damage formulas are used for players and monsters:
+
Poison attacks frequently result in a monster or player having the "poisoned" [[condition]]. While poisoned, a creature will take an amount of damage proportional to the degree to which it is poisoned. Each dose of poison "stacks" with previous ones, increasing the eventual damage. Different damage formulas are used for players and monsters:
  
 
===Player Formula===
 
===Player Formula===
*Each turn, you have a poison_level in 5 chance of taking damage from poison; at 5+ levels of poison, this is automatic.  The damage is as follows:
+
*For players, poisoning has a predetermined total damage, and will deal a portion of that damage each turn. The more poisoned you are, the more damage per turn this will do and the longer it will last. The total amount of damage it will eventually do is displayed as a yellow-highlighted section of the health bar.
**If you have more than 10 levels of poisoning, if 1d(poison_level) is greater than 8, you will take 1d10+4 damage.
 
**If you have 5-10 levels of poisoning, there is a 50% chance you will take 2-3 points of damage.
 
**Otherwise, you will take 1 point of damage.
 
*You also have a 1 in 8 chance of losing one level of poison each turn (1 in 3 if you have been reduced to 1 hp).
 
*If your [[Cheibriados]] piety is at * or above (slowed/strengthened metabolism), there is a 50% chance you will take no damage &ndash; but this will bypass the check to lose a level of poison as well. This effectively halves the damage per turn of poison but doubles its duration (which also gives you more time to regenerate health).
 
  
===Monster Formula===
+
*If your [[Cheibriados]] piety is at * or above (slowed/strengthened metabolism), poisoning will only do 2/3rds as much damage per [[aut]] but will last 1.5 times as long. This effectively spreads the damage out over a longer time, which gives you more time to regenerate health.
poisonval = number of stacked poison statuses on the monster
+
 
 +
===Monster Formula<ref>{{source ref|0.25.0|mon-ench.cc|1461}}</ref>===
 +
''poisonval'' is the number of stacked poison statuses on the monster.
 
*If poisonval >= 4, base damage is 1. Otherwise, base damage is 0.
 
*If poisonval >= 4, base damage is 1. Otherwise, base damage is 0.
*There is a 50% chance of an additional 1d(poisonval+1) damage.
+
*There is a 50% chance of an additional <code>1d(poisonval + 1)</code> damage.
*If the monster is vulnerable to poison, there is an additional 2d(poisonval) - 1 damage.
+
*If the monster is vulnerable to poison, there is an additional <code>2d(poisonval) - 1</code> damage.
Source: [http://git.develz.org/?p=crawl.git;a=blob;f=crawl-ref/source/mon-ench.cc#l1365 mon-ench.cc]
 
  
 
{| class="wikitable" style="text-align: center;"
 
{| class="wikitable" style="text-align: center;"
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==History==
 
==History==
Prior to [[0.13]], [[Statue Form]] only granted one level of poison resistance.
+
*Prior to [[0.18]], monsters with poison resistance were immune to the poison status effect, except from the staff of poison and poison arrow.
 +
*Prior to [[0.17]], as an added benefit, poison resistance allowed you to eat poisoned chunks, which have been removed and replaced by inedible chunks.
 +
*Prior to [[0.14]], poison's damage over time was randomized instead of being a fixed value.
 +
*Prior to [[0.13]], [[Statue Form]] only granted one level of poison resistance.
 +
 
 +
==Notes and References==
 +
<references/>
  
 
==See Also==
 
==See Also==
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[[Category:Status effects]]
 
[[Category:Status effects]]
 
[[Category:Threats]]
 
[[Category:Threats]]
[[Category:Crystal Ball Articles]] <!-- formicids and zin's vitalisation -->
 

Revision as of 19:25, 30 July 2020

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

This page is about the effect. For the spell school and skill see Poison Magic.

Poison is one of the most common elemental forces you will encounter as you explore the Dungeon. Both players and monsters can take advantage of poison through spells or specially branded weapons, though it is most commonly encountered in the form of the stings and bites of poisonous monsters.

Poison Damage

Generally, poison damage occurs over time whenever something suffers from the Poison condition (indicated by the word Pois on your status, and by yellow highlighting on your health bar). The duration of this condition and the amount of damage it deals per turn depends heavily upon the severity of the poison. This is displayed by the color of the word "Pois" in your status: yellow lettering means mild poison, pink is medium, and red is severe. In addition, part of your health bar will turn yellow to indicate the total damage that the poison will eventually do. Be cautious in areas with poisonous monsters, as the poison condition can be stacked; getting hit multiple times from a poisonous enemy can result in severe poisoning if you're careless.

While even low-level characters can usually survive mild poisoning, severe cases can deal tremendous amounts of damage over time. In any case, it is almost always best to rest and avoid combat until the poison has run its course, perhaps on a cleared floor to avoid wandering monsters.

Alternatively, some spells and abilities deal poison damage directly, causing an immediate drop in HP. These attacks usually also inflict the poison condition, making them exceedingly dangerous for characters without appropriate defenses.

Try to avoid being both sick and poisoned, as your natural regeneration contributes much to your chances of surviving poison. This is also why poison is more dangerous to low-level characters than high-level ones -- at low levels, your regeneration rate may not be fast enough to keep up with poison.

Poison Sources

It is relatively easy for characters to gain access to sources of poison damage. Characters who specialize in weapons that strike quickly can benefit from venom-branded weapons, which inflict the poison condition on top of their normal physical damage. The staff of poison and staff of Olgreb have a poisonous melee attack that is dependent on your skill in Poison Magic and Evocations. Poisoned darts can be Thrown for a ranged poison attack.

The Poison Magic school is also available to venom mages or any character with Spellcasting capabilities and an appropriate book. This school is devoted almost entirely to dealing poison damage, though it also contains some spells for inflicting confusion.

Nagas have an innate Spit Poison ability which inflicts significant physical and poison damage.

Needle traps may inflict the condition, as will being affected by miasma.

Poison Types

Monsters can have two types of poison attacks: normal and strong poison. Both have a 1/3 chance to trigger on each hit.

  • Normal poison will poison the player for a random amount between 2 and 4 times the monster's HD
  • Strong poison will instead poison for 3.67-6.5 times the monster's HD

Poison-branded weapons have a 3 in 4 chance to trigger, and do not depend on HD. Instead, they add poison damage equal to 6-13 plus a random amount from 0 to 1.5x the damage done.

Poison Resistance

Players and monsters can have a single level of rPois or, less commonly, complete immunity (which is represented as three levels of resistance in the game's code). Having multiple sources of poison resistance is no more effective than having a single one, though: an Octopode can't wear three rings to become immune.

Resistance confers immunity to Mephitic Cloud and Alistair's Intoxication, and gives a 2 in 3 chance of shrugging off poison at the time that it is applied. Complete immunity makes one impervious to the "poisoned" condition, although poison damage is only partly reduced (see below) and many poison attacks have a physical component as well.

You can acquire poison resistance from a number of sources:

Additionally, there are a few ways to become totally immune:

  • Being an undead race (mummy, ghoul, or bloodless vampire)
  • Being a gargoyle
  • Casting Necromutation or Statue Form renders you temporarily immune to poison. Poison won't count down during these transformations, however, so if you cast them while poisoned you'll be just as poisoned when they end.
  • Wielding the Staff of Olgreb. Unlike the transmutations above, the poison status will count down (harmlessly) while you wield it.

Some things other than resistance can help against poison as well:

  • Zin's Vitalisation ability prevents the status effect, but you still take full damage from sources of direct poison damage like Poison Arrow or Poisonous Cloud. However, it does grant resistance to Venom Bolt and Sting.
  • Deep dwarf damage shaving affects damage from poison, and will completely negate up to 25 points of poison damage.
  • Healing yourself through other means will not cure the condition, but may give you the HP you need to wait it out.

Poison Vulnerability

Some monsters (particularly insects and spiders – and you, in Spider Form) are vulnerable to poison, taking twice as much damage from poison attacks, and doubling the amount of poisoning received.

Damage Reduction

Resistance Level Damage Taken (Player) Damage Taken (Monster)
-1 100% 150%
0 100% 100%
1 100% or 50%[1] 50%
2 - 20%
3 50% 0%
Resistance Level Damage Taken (Player) Damage Taken (Monster)
-1 135% 135%
0 100% 100%
1 65% 65%
2 - 44%
3 44% 30%

Curing Poison

Characters that lack poison resistance can still avoid the worst of its effects by curing the condition before it runs its course. The following options are available:

Poisoned Condition

Poison attacks frequently result in a monster or player having the "poisoned" condition. While poisoned, a creature will take an amount of damage proportional to the degree to which it is poisoned. Each dose of poison "stacks" with previous ones, increasing the eventual damage. Different damage formulas are used for players and monsters:

Player Formula

  • For players, poisoning has a predetermined total damage, and will deal a portion of that damage each turn. The more poisoned you are, the more damage per turn this will do and the longer it will last. The total amount of damage it will eventually do is displayed as a yellow-highlighted section of the health bar.
  • If your Cheibriados piety is at * or above (slowed/strengthened metabolism), poisoning will only do 2/3rds as much damage per aut but will last 1.5 times as long. This effectively spreads the damage out over a longer time, which gives you more time to regenerate health.

Monster Formula[2]

poisonval is the number of stacked poison statuses on the monster.

  • If poisonval >= 4, base damage is 1. Otherwise, base damage is 0.
  • There is a 50% chance of an additional 1d(poisonval + 1) damage.
  • If the monster is vulnerable to poison, there is an additional 2d(poisonval) - 1 damage.
Poison damage taken each turn (monster only)
# stacked poison Average (normal) Average (vulnerable) Min (normal) Min (vulnerable) Max (normal) Max (vulnerable)
1 0.75 1.75 0 1 2 3
2 1 3 0 1 3 6
3 1.25 4.25 0 1 4 9
4 2.5 6.5 1 2 6 13
5 2.75 7.75 1 2 7 16
6 3 9 1 2 8 19
N N/4 + 1.5 N * 5/4 + 1.5 1 2 N + 2 N * 3 + 1

History

  • Prior to 0.18, monsters with poison resistance were immune to the poison status effect, except from the staff of poison and poison arrow.
  • Prior to 0.17, as an added benefit, poison resistance allowed you to eat poisoned chunks, which have been removed and replaced by inedible chunks.
  • Prior to 0.14, poison's damage over time was randomized instead of being a fixed value.
  • Prior to 0.13, Statue Form only granted one level of poison resistance.

Notes and References

  1. 100% if it inflicts a dose of poison despite poison resistance. 50% otherwise.
  2. mon-ench.cc:1461 (0.25.0)

See Also

List of poison resistant monsters

List of poison vulnerable monsters