Difference between revisions of "Constriction"

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'''Constriction''' is the act of grabbing a target, preventing it from moving away, and crushing it to death over several turns. This makes it much easier to defeat fast-moving enemies such as [[bat]]s and [[unseen horror]]s, and prevents monsters from fleeing. Only certain [[species]] and monsters are capable of doing this:
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'''Constriction''' is the act of grabbing a target, preventing it from moving away, and crushing it to death over several turns. This lowers the [[ev]]asion of the target, and prevents them from moving or [[blink]]ing away.
*{{monsterlink|Ball python}}
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*{{monsterlink|Anaconda}}
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==List of constrictors==
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===Monsters===
 
*{{Green|N}} [[File:Naga (monster).png]] '''[[Naga (monster)|Naga]]'''
 
*{{Green|N}} [[File:Naga (monster).png]] '''[[Naga (monster)|Naga]]'''
 
*{{monsterlink|Naga mage}}
 
*{{monsterlink|Naga mage}}
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*{{monsterlink|Naga sharpshooter}}
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*{{monsterlink|Naga ritualist}}
 
*{{monsterlink|Naga warrior}}
 
*{{monsterlink|Naga warrior}}
*{{monsterlink|Greater naga}}
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*{{monsterlink|Nagaraja}}
*{{monsterlink|Lamia}}
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*{{monsterlink|Snaplasher vine}}
*{{LightCyan|x}} [[File:Octopode_(monster).png]] '''[[Octopode (monster)|Octopode]]'''
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*{{monsterlink|Ball python}}
*{{monsterlink|Ravenous mimic}}
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*{{monsterlink|Anaconda}}
*{{monsterlink|Tentacled starspawn}}
 
 
*{{monsterlink|Tentacled monstrosity}}
 
*{{monsterlink|Tentacled monstrosity}}
*You, if you're playing an [[octopode]]
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*{{monsterlink|Starspawn tentacle}}
*You, if you're playing a level 13+ [[naga]]
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*{{LightCyan|x}} [[File:Octopode (monster).png]] '''[[Octopode (monster)|Octopode]]'''
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*{{monsterlink|Vashnia}}
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*'''[[Grasping Roots]]'''
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**{{monsterlink|Jorgrun}}
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**{{monsterlink|Shambling mangrove}}
 +
 
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===Playable species===
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*'''[[Octopode]]'''
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*'''[[Naga]]''' - gains the ability at [[experience level]] 13.
 +
 
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===Other Constriction Effects===
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*[[Borgnjor's Vile Clutch]]
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*[[Wand of roots]]
  
 
==Initiating Constriction==
 
==Initiating Constriction==
Constriction occurs whenever a constriction-capable character or monster makes a melee attack (not necessarily [[Unarmed Combat]]). All the following conditions must apply:
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Constriction can occur whenever a constriction-capable character or monster makes a melee attack (not necessarily [[Unarmed Combat]]). All the following conditions apply:<ref>{{source ref|0.30.0|actor.cc|687}}</ref>
 
*The attacker is not constricting another creature, unless the attacker is an octopode that has free tentacles. Octopodes are capable of maintaining up to eight at once (it doesn't matter if you wield weapons or shields).
 
*The attacker is not constricting another creature, unless the attacker is an octopode that has free tentacles. Octopodes are capable of maintaining up to eight at once (it doesn't matter if you wield weapons or shields).
*The defender is not constricted by another creature (only one constricter at a time).
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*The defender is not constricted or engulfed by another creature.
 
*The attacker must be able to see the victim.
 
*The attacker must be able to see the victim.
 
*The attacker is not confused.
 
*The attacker is not confused.
 
*The size of the attacker is greater than or equal to the size of the defender.
 
*The size of the attacker is greater than or equal to the size of the defender.
*The defender is not immune to constriction attacks. The following monsters are immune: [[porcupine]]s, [[list of jellies|jellies]], [[flaming corpse]]s and [[:Category:insubstantial monsters|insubstantial]] monsters.
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*The defender is not immune to constriction attacks (see below).
 
*The defender must be next to the attacker (weapons of reaching don't allow you to constrict non-adjacent targets).
 
*The defender must be next to the attacker (weapons of reaching don't allow you to constrict non-adjacent targets).
  
If all the previous requisites are met, the game rolls the to_hit of the attacker and the evasion/SH of the defender. For the player, to_hit is calculated as follows:
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If all the previous requisites are met, the game rolls the to_hit of the attacker and the evasion/SH of the defender. For the player this is the standard [[auxiliary attack]] to_hit. Its calculated as follows:
  to_hit = 13 + DEX*0.6 + STR*0.15 + Fighting*0.3 + Slaying bonus + Other bonuses
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  to_hit = 13 + DEX*0.75 + Fighting*0.3 + Slaying bonus + Other bonuses<ref>{{source ref|0.30.0|fight.cc|71}}</ref>
 +
 
 
For the monsters, it is basically:
 
For the monsters, it is basically:
  to_hit = 18 + HD*1.5 + Other bonuses (replace 1.5 with 2.5 if the monster is a [[:Category:Fighter|fighter]]: naga warriors)
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  to_hit = 18 + HD*1.5 + Other bonuses (replace 1.5 with 2.5 if the monster is a [[:Category:Fighter|fighter]] i.e. naga warriors)
 
If the attack hits, the constriction starts.
 
If the attack hits, the constriction starts.
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 +
===Constriction Immunity===
 +
 +
The following monsters are immune<ref>{{source ref|0.30.0|monster.cc|3834}}</ref>:
 +
*[[list of jellies|jellies]],
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*[[:Category:Spiny|spiny]] monsters,
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*[[:Category:insubstantial monsters|insubstantial]] monsters.
 +
 +
Player sources<ref>{{source ref|0.30.0|player.cc|6438}}</ref>:
 +
*[[insubstantial]] forms, like the [[Storm Form]] or [[wisp form]],
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*the [[Spiny (mutation)|Spiny]] mutation, which is available only to [[demonspawn]],
 +
*[[slick slippers]] unrand.
  
 
==Maintaining Constriction==
 
==Maintaining Constriction==
While the target is constricted, it will take an increasing amount of damage each turn, will be unable to move in any direction, and will suffer an [[ev]]asion penalty (-3 EV for the player; for monsters EV is divided by 2+body [[size]]). Attempting to move away will constitute an escape attempt, using all of the above variables along with the number of escape attempts thus far (successive attempts have better success rates) to determine whether or not the escape succeeds.
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While the target is constricted, it will take an increasing amount of damage each turn, will be unable to move in any direction, and will suffer an [[ev]]asion penalty (-3 EV for the player; for monsters EV is divided by <code>2 + body [[size]]</code>). Attempting to move away will constitute an escape attempt, using all of the above variables along with the number of escape attempts thus far (successive attempts have better success rates) to determine whether or not the escape succeeds.
  
 
===Damage Calculations===
 
===Damage Calculations===
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   (Base damage) * (1 + log2(1 + Duration/5)) * (0.33 + 0.67 * (XL/27))
 
   (Base damage) * (1 + log2(1 + Duration/5)) * (0.33 + 0.67 * (XL/27))
  
*'''Base damage''': For players 2d([[Strength]]/5), which means that a character with 20 points of strength will do twice as much damage as a character with only 10. For monsters, it is the base damage of that particular attack.
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*'''Base damage''': For players <code>2d([[Strength]]/5)</code>, which means that a character with 20 points of strength will do twice as much damage as a character with only 10. For monsters, it is the base damage of that particular attack.
 
*'''Duration modifier''': The second factor means that the more time you have been constricting a monster the more damage you do. The damage is increased by approximately 20% each turn, so after 5 turns you will do twice as much damage as you did in the first turn. After the fifth turn the rate is a bit lower than 20%.
 
*'''Duration modifier''': The second factor means that the more time you have been constricting a monster the more damage you do. The damage is increased by approximately 20% each turn, so after 5 turns you will do twice as much damage as you did in the first turn. After the fifth turn the rate is a bit lower than 20%.
 
*'''Experience level modifier''': The third factor means that your damage increases linearly with your [[experience level]]. A level 27 character will do thrice as much damage as one at level 1.
 
*'''Experience level modifier''': The third factor means that your damage increases linearly with your [[experience level]]. A level 27 character will do thrice as much damage as one at level 1.
*'''AC reduction''': Unlike most melee attacks, constriction is not reduced by a random number between 0 and [[AC]]; the damage reduction is a random number between 0 and 1+AC/2. This means that constriction bypasses half of the AC.
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*'''AC reduction''': Unlike most melee attacks, constriction is not reduced by a random number between 0 and [[AC]]; the damage reduction is a random number between 0 and <code>1 + AC/2</code>. This means that constriction bypasses half of the AC.
*'''Time scale''': The previous formula calculates how much damage you do every 10 [[aut]]s. That amount needs to be scaled depending on how many auts you have spent in this turn. For example: if you are attacking with a [[quick blade]] at minimum delay (3 auts), the previous amount will be multiplied by 3/10 (after AC reduction).
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*'''Time scale''': The previous formula calculates how much damage you do every 10 [[aut]]s. That amount needs to be scaled depending on how many auts you have spent in this turn. For example: if you are attacking with a [[quick blade]] at minimum delay (3 auts), the previous amount will be multiplied by <code>3/10</code> (after AC reduction).
  
 
==Escaping Constriction==
 
==Escaping Constriction==
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*Killing the constrictor
 
*Killing the constrictor
 
*If the constrictor moves from its current tile, constriction ends (even if the destination is still adjacent to the constricted target)
 
*If the constrictor moves from its current tile, constriction ends (even if the destination is still adjacent to the constricted target)
*Fear (through either a [[scroll of fear]] or [[Cause Fear]]) does the same thing
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**The [[dispersal (brand)|dispersal]] and [[distortion]] brands can force the constrictor to blink away (or be banished to [[the Abyss]])
*[[Confusion]], [[Paralyze|paralysis]], [[Petrify|petrification]], [[enslavement]], [[polymorph]]ing, or [[Sleep|unconsciousness]] of the constrictor immediately breaks constriction
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**Casting [[Teleport Other]], [[Dispersal]] or [[Disjunction]] has a similar effect
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**Forcing the constrictor back with [[Iskenderun's Mystic Blast]] may also work but may not be as effective against larger monsters
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**Casting [[Polar Vortex]] will force the enemy away from you much more aggressively
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*Disabling the constrictor with [[confusion]], [[Paralyze|paralysis]], [[Petrify|petrification]], [[fear]], or [[Sleep|unconsciousness]] immediately breaks constriction
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**[[wand of charming|Charming]] or [[polymorph]]ing the constrictor also breaks constriction (and likely prevents them from making future attempts)
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**[[Elyvilon]]'s healing abilities may allow you to pacify the constrictor
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*Becoming immune to constriction will immediately end the status.
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** [[Storm Form]] is immune to constriction.
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** Casting [[Dragon Form]] or entering [[Tree Form]] will greatly increase your size; only tentacled monstrosities are large enough to constrict those forms.
 
*Any source of [[blink]]ing can get you free. It counts as two escape attempts.
 
*Any source of [[blink]]ing can get you free. It counts as two escape attempts.
*[[Teleportation]] will get you free after a delay.
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**[[Barachim]] can hop away, while [[Dithmenos]] gives Shadow Step. Both also count as two escape attempts, like with blink.
*The [[dispersal (brand)|dispersal]] and [[distortion]] brands can instead force the constrictor to blink away (or be banished to [[the Abyss]])
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*[[Teleportation]] will always let you escape constriction
*Casting [[Teleport Other]] or [[Dispersal]] has a similar effect
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*[[Formicid]]'s shaft ability will always escape constriction
*Casting [[Tornado]] will force the enemy away from you much more aggressively
 
*Casting [[Dragon Form]] will greatly increase your size, making constriction much more difficult
 
 
*[[Zin]]'s Sanctuary ability breaks constriction
 
*[[Zin]]'s Sanctuary ability breaks constriction
*[[Elyvilon]]'s healing abilities may allow you to pacify the constrictor
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*[[Ru]]'s Draw Out Power and Power Leap will always escape construction
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==History==
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*Since [[0.18]], to_hit only depends on [[Dexterity]].
  
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==References==
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<references/>
 
[[Category:Status effects]]
 
[[Category:Status effects]]

Revision as of 02:40, 25 May 2023

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

Constriction is the act of grabbing a target, preventing it from moving away, and crushing it to death over several turns. This lowers the evasion of the target, and prevents them from moving or blinking away.

List of constrictors

Monsters

Playable species

Other Constriction Effects

Initiating Constriction

Constriction can occur whenever a constriction-capable character or monster makes a melee attack (not necessarily Unarmed Combat). All the following conditions apply:[1]

  • The attacker is not constricting another creature, unless the attacker is an octopode that has free tentacles. Octopodes are capable of maintaining up to eight at once (it doesn't matter if you wield weapons or shields).
  • The defender is not constricted or engulfed by another creature.
  • The attacker must be able to see the victim.
  • The attacker is not confused.
  • The size of the attacker is greater than or equal to the size of the defender.
  • The defender is not immune to constriction attacks (see below).
  • The defender must be next to the attacker (weapons of reaching don't allow you to constrict non-adjacent targets).

If all the previous requisites are met, the game rolls the to_hit of the attacker and the evasion/SH of the defender. For the player this is the standard auxiliary attack to_hit. Its calculated as follows:

to_hit = 13 + DEX*0.75 + Fighting*0.3 + Slaying bonus + Other bonuses[2]

For the monsters, it is basically:

to_hit = 18 + HD*1.5 + Other bonuses (replace 1.5 with 2.5 if the monster is a fighter i.e. naga warriors)

If the attack hits, the constriction starts.

Constriction Immunity

The following monsters are immune[3]:

Player sources[4]:

Maintaining Constriction

While the target is constricted, it will take an increasing amount of damage each turn, will be unable to move in any direction, and will suffer an evasion penalty (-3 EV for the player; for monsters EV is divided by 2 + body size). Attempting to move away will constitute an escape attempt, using all of the above variables along with the number of escape attempts thus far (successive attempts have better success rates) to determine whether or not the escape succeeds.

Damage Calculations

The amount of damage inflicted every 10 auts is:

 (Base damage) * (1 + log2(1 + Duration/5)) * (0.33 + 0.67 * (XL/27))
  • Base damage: For players 2d(Strength/5), which means that a character with 20 points of strength will do twice as much damage as a character with only 10. For monsters, it is the base damage of that particular attack.
  • Duration modifier: The second factor means that the more time you have been constricting a monster the more damage you do. The damage is increased by approximately 20% each turn, so after 5 turns you will do twice as much damage as you did in the first turn. After the fifth turn the rate is a bit lower than 20%.
  • Experience level modifier: The third factor means that your damage increases linearly with your experience level. A level 27 character will do thrice as much damage as one at level 1.
  • AC reduction: Unlike most melee attacks, constriction is not reduced by a random number between 0 and AC; the damage reduction is a random number between 0 and 1 + AC/2. This means that constriction bypasses half of the AC.
  • Time scale: The previous formula calculates how much damage you do every 10 auts. That amount needs to be scaled depending on how many auts you have spent in this turn. For example: if you are attacking with a quick blade at minimum delay (3 auts), the previous amount will be multiplied by 3/10 (after AC reduction).

Escaping Constriction

Along with simply succeeding at an escape attempt, there are a number of other methods for breaking free:

  • Killing the constrictor
  • If the constrictor moves from its current tile, constriction ends (even if the destination is still adjacent to the constricted target)
  • Disabling the constrictor with confusion, paralysis, petrification, fear, or unconsciousness immediately breaks constriction
    • Charming or polymorphing the constrictor also breaks constriction (and likely prevents them from making future attempts)
    • Elyvilon's healing abilities may allow you to pacify the constrictor
  • Becoming immune to constriction will immediately end the status.
    • Storm Form is immune to constriction.
    • Casting Dragon Form or entering Tree Form will greatly increase your size; only tentacled monstrosities are large enough to constrict those forms.
  • Any source of blinking can get you free. It counts as two escape attempts.
    • Barachim can hop away, while Dithmenos gives Shadow Step. Both also count as two escape attempts, like with blink.
  • Teleportation will always let you escape constriction
  • Formicid's shaft ability will always escape constriction
  • Zin's Sanctuary ability breaks constriction
  • Ru's Draw Out Power and Power Leap will always escape construction

History

References

  1. actor.cc:687 (0.30.0)
  2. fight.cc:71 (0.30.0)
  3. monster.cc:3834 (0.30.0)
  4. player.cc:6438 (0.30.0)