Difference between revisions of "Stealth"

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''This page refers to stealth stat, as well as the general mechanic. For the skill, see [[Stealth (skill)]]. For the Stealth armour ego, see the [[ego|list of egos]].''
 
''This page refers to stealth stat, as well as the general mechanic. For the skill, see [[Stealth (skill)]]. For the Stealth armour ego, see the [[ego|list of egos]].''
  
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The '''Stealth''' stat determines how likely you are to be detected. While the [[Stealth (skill)|Stealth skill]] may be the most direct way to influence this stat, many other factors are equally as or more important.
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The '''Stealth''' stat determines how likely you are to be detected. While the [[Stealth (skill)|Stealth skill]] may be the most direct way to influence this stat, many other factors contribute as well:
  
 
==Stealth Score==
 
==Stealth Score==
 
The measure of a character's stealthiness is its stealth score. A character innately has a base stealth score, which is then modified by various external factors.
 
The measure of a character's stealthiness is its stealth score. A character innately has a base stealth score, which is then modified by various external factors.
  
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Your base stealth score equals:
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Your base stealth score equals:<ref>{{source ref|0.30.1|player.cc|3063}}</ref>
  
 
{{crawlquote|(3 × [[Dexterity]]) + (Stealth skill × 15)}}
 
{{crawlquote|(3 × [[Dexterity]]) + (Stealth skill × 15)}}
  
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Once you've calculated your base stealth score, an adjustment is made for a special case:
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==Modifiers==
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*If you are [[confused]]: Divide by 3
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The following modifiers are applied in order:<ref>{{source ref|0.30.1|player.cc|3063}}</ref>
  
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Finally, the following flat modifiers are applied. Some of these factors may look much larger numerically than the components of the Base Stealth Score, but a high [[dexterity]] and high Stealth skill can result in a very large stealth before any modifiers get involved:
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===1. Confusion===
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Confusion's penalty applies before all other modifiers.
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*[[Confused]]: x33%
  
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===Positive Factors===
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===2. Flat Modifiers===
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*[[Boots]]/[[barding]]/[[ring of stealth]]: +50
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'''Positive'''
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*[[Randart]]s that enhance stealth: +50 per +
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*Armour of [[ego|stealth]]: +50 per item
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*[[Boots of the Assassin]]: +80 (unrand)
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*Artefacts with Slth+: +50 per Slth+
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*The [[Shadow card]]: +80
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*[[Mutations]]:
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*[[Nightstalker]] mutation: +50 per rank
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**[[Nightstalker]] mutation: +50 per rank
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*[[Thin Skeletal Structure]] mutation: +25 per rank
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**[[Camouflage]] mutation: +50 per rank
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*[[Camouflage]] mutation ([[octopode]]s start at rank 1): +50 per rank
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**[[Thin Skeletal Structure]] mutation: +50 per rank
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*[[Translucent Skin]] mutation: +15 per rank
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**[[Translucent Skin]] mutation: +50 per rank
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*Playing a [[merfolk]] or [[octopode]] while in [[water]]: +50
 
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*When under the effect of an [[Umbra]]: Multiply by roughly 2 (If from [[Dithmenos]], the exact amount is dependent on piety.)
 
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*[[Bat Form]] [[vampire]]: +50
 
 
*Bloodless [[vampire]]: +100
 
*Bloodless [[vampire]]: +100
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*[[Felid]] paws: +20 if walking.
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**[[Bat Form]] [[vampire]]: +50
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*[[Merfolk]]/[[Octopode]] in [[water]]: +50
  
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===Negative Factors===
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'''Negative'''
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*Wearing armour: -2 × ([[Encumbrance rating]])<sup>2</sup> / 3
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*[[Armour encumbrance|Body armour encumbrance]]: -2 × ([[Encumbrance rating]])<sup>2</sup> / 3
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*Traveling through [[shallow water]] (unless [[fly]]ing): Divide by 2
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*When emitting [[Silence]]: -50
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**[[Merfolk]], [[octopode]]s, [[naga]]s, [[ogre]]s, [[troll]]s, and grey [[draconian]]s receive no water penalty.
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*Artefacts with Slth-: +50 per Slth-
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*[[Hooves]]: -10/-15/-20 for rank 1/2/3, if on the ground.
 
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*When under the effect of [[Silence]]: -50, plus an additional penalty based on the ambient [[noise]] of your current [[branch]] (louder areas penalize you more when silenced than quiet areas)
 
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*[[Felid]] under [[Blade Hands]]: -50.
 
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*When under the effect of [[Corona]] or a [[Halo]]: Divide by roughly 2.5
 
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*Carrying the [[Orb of Zot]]: Divide by 3
 
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*When [[berserk]]: Stealth = 0
 
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*Randarts that reduce stealth: -50 per -
 
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*Worshipping [[Qazlal]]: Stealth is multiplied by (200 - min(piety, 160)) / 170, so at piety 160 or higher your stealth is roughly divided by 4.
 
  
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If your Stealth score is < 0, it is treated as though it were 0.
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===3. Multipliers===
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*In [[shallow water]] (if not [[flying]], [[large]], or [[amphibious]]): x0.5
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*[[Umbra]]: depends on the source. The highest stealth source is used. This only applies when the player is the source of umbra.
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**[[Ring of shadows]]: x1.5
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**[[Dithmenos]]: Varies based on piety. Equal to x<code>2 * (current_radius / max_radius)</code>, or x1 at minimum, x2 at maximum.
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*[[Backlit]] ([[Corona]], [[halo]], etc.): x0.40
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*Carrying the [[Orb of Zot]]: x0.33
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*[[Shadow Form]]: x2
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*[[Qazlal]]: Stealth is multiplied by <code>(200 - piety) / 170</code>, with a minimum of x0.25
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The following statuses set stealth to 0:
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*[[Berserk]]
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*[[Clumsy]] (Dex=0)
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If your Stealth score is below 0, it is treated as though it were 0.
  
 
===In-Game Display===
 
===In-Game Display===
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Although you cannot display your exact Stealth Score, you can get an idea of it by pressing the '''%''' or '''@''' buttons. You'll see a description of your stealthiness which correlates to the following Stealth Scores:
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Although you cannot display your exact Stealth Score, you can get an idea of it in the '''%''' screen. Every '+' is 50 stealth, every '*' is 100 stealth, '#' is 150 stealth, and '!' is 200 stealth.
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*0- 9: "Extremely unstealthy"
 
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*10-29: "Very unstealthy"
 
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*30-59: "Unstealthy"
 
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*60-89: "Fairly stealthy"
 
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*90-119: "Stealthy"
 
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*120-159: "Quite stealthy"
 
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*160-219: "Very stealthy"
 
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*220-299: "Extremely stealthy"
 
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*300-399: "Extraordinarily stealthy"
 
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*400-519: "Incredibly stealthy"
 
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*520+: "Uncannily stealthy"
 
  
 
==Detection==
 
==Detection==
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Every monster has their own Monster Awareness score. Each monster has a base awareness of 10, modified as follows:
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Every monster has their own Monster Awareness score. Each monster has a base awareness of 10, modified as follows:<ref>{{source ref|0.30.1|shout.cc|287}}</ref>
  
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===Positive Factors===
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'''Positive Factors'''
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*[[Monster intelligence]]: +0 for plants/jellies/zombies, +4 for insects, +8 for animals, +12 for humanoids, +16 for highly intelligent monsters
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*[[Monster intelligence]]: +0 for mindless, +8 for animal intelligence, +12 for human intelligence
 
*[[Hit dice]]: +1 per HD
 
*[[Hit dice]]: +1 per HD
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*[[Sense invisible]]: +5
 
 
*If the monster is wandering instead of sleeping: +15
 
*If the monster is wandering instead of sleeping: +15
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*Demons, the undead, holy beings, golems, and plants: +10
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*Any monster that is not [[natural]] holiness: +10
  
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===Negative Factors===
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'''Negative Factors'''
 
*Monsters under the effects of [[Ensorcelled Hibernation]]: -10
 
*Monsters under the effects of [[Ensorcelled Hibernation]]: -10
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*If the player is [[invisible]] and the monster can't see invisible (or if the monster can sense invisible and the distance between the monster and the player is greater than 4): -75
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*If the player is [[invisible]] and the monster can't see invisible: -75
  
 
If Monster Awareness is < 0, it is treated as though it were 0.
 
If Monster Awareness is < 0, it is treated as though it were 0.
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==History==
 
==History==
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* In [[0.27]], [[hooves]] as well as [[felid]] paws and [[Blade Hands|Blade Paws]] no longer impact stealth while walking (i.e. while ''not'' [[water|swimming]] or [[flying]]).
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*Prior to [[0.27]], [[hooves]] had a minor stealth penalty (when not swimming or flying), and [[Translucent Skin]] offered less stealth. ALso, [[Felid]]s gained 20 stealth when not swimming/flying, but lost 50 stealth if in [[Blade Hands]] when not swimming/flying.
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==References==
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<references/>

Revision as of 17:40, 16 December 2023

Version 0.30: This article may not be up to date for the latest stable release of Crawl.

This page refers to stealth stat, as well as the general mechanic. For the skill, see Stealth (skill). For the Stealth armour ego, see the list of egos.

The Stealth stat determines how likely you are to be detected. While the Stealth skill may be the most direct way to influence this stat, many other factors contribute as well:

Stealth Score

The measure of a character's stealthiness is its stealth score. A character innately has a base stealth score, which is then modified by various external factors.

Your base stealth score equals:[1]

(3 × Dexterity) + (Stealth skill × 15)

Modifiers

The following modifiers are applied in order:[2]

1. Confusion

Confusion's penalty applies before all other modifiers.

2. Flat Modifiers

Positive

Negative

3. Multipliers

The following statuses set stealth to 0:

If your Stealth score is below 0, it is treated as though it were 0.

In-Game Display

Although you cannot display your exact Stealth Score, you can get an idea of it in the % screen. Every '+' is 50 stealth, every '*' is 100 stealth, '#' is 150 stealth, and '!' is 200 stealth.

Detection

Every monster has their own Monster Awareness score. Each monster has a base awareness of 10, modified as follows:[3]

Positive Factors

  • Monster intelligence: +0 for mindless, +8 for animal intelligence, +12 for human intelligence
  • Hit dice: +1 per HD
  • If the monster is wandering instead of sleeping: +15
  • Any monster that is not natural holiness: +10

Negative Factors

If Monster Awareness is < 0, it is treated as though it were 0.

Each time you move or perform an action, all monsters in your line of sight have a (Awareness + 1) / (Your Stealth) chance of spotting you. How fast or slow this action is does not matter; a Naga and Spriggan with the same Stealth score have the same chance per move to be detected. Once they've spotted you, they'll only lose track of you once you've left their line of sight for a while; this occurs much sooner for mindless enemies than for intelligent ones.

History

  • Prior to 0.27, hooves had a minor stealth penalty (when not swimming or flying), and Translucent Skin offered less stealth. ALso, Felids gained 20 stealth when not swimming/flying, but lost 50 stealth if in Blade Hands when not swimming/flying.

References

  1. ↑ player.cc:3063 (0.30.1)
  2. ↑ player.cc:3063 (0.30.1)
  3. ↑ shout.cc:287 (0.30.1)
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