Difference between revisions of "Miscast effect"

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(First pass at update to 0.25. Facts are straight, but I no word good.)
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A [[miscast effect]] occurs when a player fails to cast a spell successfully. These can range in severity from completely harmless to inflicting heavy damage and [[magic contamination]], depending on the school of magic that is used.
 
A [[miscast effect]] occurs when a player fails to cast a spell successfully. These can range in severity from completely harmless to inflicting heavy damage and [[magic contamination]], depending on the school of magic that is used.
  
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Failure to cast spells causes various generally nasty things to occur, becoming nastier with spell level and spell failure. Miscasts come in a severity scale 0, 1, 2 and 3. 0 is always harmless, although it can occasionally make a moderate amount of noise.  
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A miscast will first cause contamination based on the severity of the failure and the spell level. Then an additional effect will be applied based on the spell school. If a spell has multiple schools, the additional effect will be chosen among them at random.
  
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Displayed in game spell failure rate color indicates the chances of getting severity 2 or greater miscast effects.
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{| class="prettytable"  
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{|class="prettytable"
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! School!! Additional Effect
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! Color !! Probability at most
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|-
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| [[Air Magic]] || [[electricity]] damage
 +
|-
 +
| [[Conjurations]] || irresistible damage
 +
|-
 +
| [[Earth Magic]] || shrapnel damage <br> (reduced by AC three times)
 +
|-
 +
| [[Hexes]] || debuff and slow <damage> turns
 +
|-
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| [[Charms]] || debuff and slow <damage> turns
 +
|-
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| [[Fire Magic]] || [[fire]] damage
 +
|-
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| [[Ice magic]] || [[cold]] damage
 +
|-
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| [[Necromancy]] || [[drain|draining]] damage
 
|-
 
|-
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| {{LightGrey|Grey}} || 0.1%
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| [[Poison Magic]] || [[poison]] damage
 
|-
 
|-
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| {{Yellow|Yellow}} || 0.5%
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| [[Summonings]] || durably summoned <br>[[nameless horror]]<br>[[HD]] = 2 * <damage> / 3
 
|-
 
|-
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| {{LightRed|Light red}} || 2.5%
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| [[Translocations]] || [[Dimension Anchor]] <damage> turns
 
|-
 
|-
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| {{Red|Red}} || Over 2.5%
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| [[Transmutations]] || double current [[contamination]] <br> then add 9 * <damage> contamination
 
|-
 
|-
 
|}
 
|}
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There is a special case if [[Hell's mystical force]] produces a [[Miscast_effect#Hell_effects|miscast effect]] that spawns any monsters: those monsters are not summons and are worth experience.
 
There is a special case if [[Hell's mystical force]] produces a [[Miscast_effect#Hell_effects|miscast effect]] that spawns any monsters: those monsters are not summons and are worth experience.
  
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Unless otherwise stated, all miscast effects for a given school and level are equally probable.
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Displayed in game spell failure rate color indicates the maximum damage of the additional effect relative to your current max [[HP]]. These are calculated as if the damage is irresistible, even for those schools whose miscast effects are resistible or not directly damaging.
  
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==Air Magic==
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{|class="prettytable"
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*1: 4-12 electric damage, or rain cloud, or [[Mephitic Cloud]]
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! Color !! Potential <br>HP Loss !! Warning <br>Description
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*2: 3d8 electric explosion or [[Poisonous Cloud]]
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|-
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*3: 12-40 [[Airstrike]], or [[twister]], or [[ball lightning]]
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| {{LightGrey|Grey}} || 0%  || safe
 +
|-
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| {{White|White}} || 10% || slightly dangerous
 +
|-
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| {{Yellow|Yellow}} || 30% || dangerous
 +
|-
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| {{LightRed|Light red}} || 50% || quite dangerous
 +
|-
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| {{Red|Red}} || 70% || extremely dangerous
 +
|-
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| {{Magenta|Purple}} || 100% || potentially lethal
 +
|-
 +
|}
  
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==Conjurations==
 
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*1: smoke or 6-12 damage
 
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*2: 9-25 damage or 3d12 explosion
 
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*3: 12-40 damage or 3d20 explosion
 
  
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==Divinations==
 
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The Divinations school has long since been removed from the game, but its miscasts remain.  They can be triggered by [[Sif Muna]]'s wrath, the [[Staff of Wucad Mu]], or any source of "random miscasts".
 
  
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*1: confusion or no effect
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==Hell effects==
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*2: confusion plus either 1-3 INT loss or 3-12 MP loss
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[[Hell]]'s mystical force selects a miscast or other effect with the probabilities given below. Hell effects only apply the additional effect of the specific spell school, not the initial contamination.
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*3: confusion plus either 3-5 INT loss or 5-24 MP loss
 
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==Earth Magic==
 
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*1: harmless
 
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*2: 10-22 damage (checked by AC)
 
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*3: 80% chance: 3d15 explosion, or 20% chance: [[Petrification]]
 
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==Hexes==
 
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*1: [[corona]] or [[scroll of random uselessness|random uselessness]]
 
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*2: 42% chance: [[Vertigo]], or 42% chance: [[Slow]]ing, or 14% chance: [[Silence]]
 
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*3: Fall [[Sleep|asleep]] for 3-9 turns<ref name="nosleep">Only caused by normal miscasts, not by hell effects. Only when player is not sleep immune ([[undead]], [[nonliving]] or [[berserk]]).</ref>, or [[Scroll of vulnerability|Magic vulnerability]] effect on self, or Confusion, or 0-18 [[Magical contamination|glow]]
 
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==Charms==
 
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*1: [[corona]] or [[scroll of random uselessness|random uselessness]]
 
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*2: [[Weakness]] (3/7 chance), slowing (3/7), or berserk (1/7)
 
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*3: [[Paralysis]] for 2-7 turns<ref name="nopara">Only caused by normal miscasts, not by hell effects.</ref>, [[confusion]], 0-18 [[Magical contamination|glow]], or [[potion of cancellation|cancellation]] effect and plus 4-6 MP loss (can actually remove some magical contamination)
 
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==Fire Magic==
 
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*1: summons 1-2 [[fire vortex|fire vortices]], or 2-14 fire damage '''only if''' the player has fire vulnerability ('''rF-''')
 
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*2: 5-33 fire damage, or 3d14 [[Fireball]]
 
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*3: 9-41 fire damage plus temporarily reduced [[fire resistance]] ('''rF-'''), or 3d20 Fireball, or [[Sticky Flame]]
 
  
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==Ice Magic==
 
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*1: nothing, or 4-8 damage '''only if''' the player has cold vulnerability ('''rC-''').
 
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*2: 5-16 ice damage plus temporary -Potion, or 3d11 ice explosion
 
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*3: 9-31 ice damage plus [[Frozen]] status effect, or [[Freezing Cloud]]
 
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==Necromancy==
 
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[[Torment]], [[rotting]], and [[draining]] damage have no effect on undead. For spells, no effect at all if Kiku** and Piety/150 chance.  These effects are also frequently seen as [[death curse]]s from non-plain [[List of mummies|mummies]].  For death curses, if Kiku**, then Kiku has a 1/2 chance of blocking it entirely, otherwise reduces the severity by one level.
 
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*1: Slowing, rotting, or 5-19 [[torment]] damage
 
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*2: Draining, 3 [[shadow|shadows]], or 15-37 [[torment]] damage
 
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*3: Draining, [[reaper]], [[soul eater]], random stat loss 1-7, rotting, or player-targeted [[torment]]
 
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==Poison Magic==
 
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Poison resistance blocks the damage and stat loss, and renders the clouds harmless.
 
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*1: 7-15 [[poison]] damage or [[Mephitic Cloud]] on your location only
 
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*2: 14-30 poison damage, large Mephitic Cloud, or temporary poison vulnerability
 
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*3: 20-54 poison damage, [[Poisonous Cloud]], or random stat loss 1-5
 
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==Summonings==
 
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*1: 5-13 damage (50% chance), or [[spatial vortex]] (17% chance), or [[lesser demon]] (33% chance)
 
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*2: 1-3 spatial vortices (1/6 chance), [[common demon]] (1/3), or 2-3 [[small abomination]]s (1/2)
 
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*3: 1-3 [[worldbinder]]s, or 1-2 [[common demon]]s, [[greater demon]], [[banishment]]<ref name="banishment">Attempts to banish.  This fails if it's a Hell effect miscast, or if you're in the Abyss with a depth/5 chance.  If it fails, attempt to place a Malign Gateway.  If that fails, reroll the effect.</ref>, or [[Malign Gateway]]<ref name="gateway">If this fails to place, reroll.</ref>
 
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Spatial vortices and [[greater demon]]s summoned in this manner are [[durably summoned]], so they do not time out and cannot be abjured.
 
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==Translocations==
 
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*1: 4-12 damage (1/2 chance), 4-10 damage and [[Blink]] (1/3), or [[spatial vortex]] (1/6)
 
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*2: 9-31 damage (3/7 chance), 5-13 damage + confusion + 66% chance blink, 33% chance teleport (2/7), 1-3 spatial vortices (1/7), or banishment<ref name="banishment"/> (1/7).
 
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*3: 15-43 damage plus [[Dimension Anchor]], 9-25 damage plus confusion plus teleport, banishment<ref name="banishment"/>, or 0-18 [[Magical contamination|glow]].
 
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==Transmutations==
 
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*1: 1-11 damage (1/2 chance) , summon 2-4 [[giant cockroach]]es (1/10), or random uselessness (2/5)
 
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*2: short [[polymorph]] (1/5 chance) , 3-25 damage (2/5), [[weak]]ness (1/5), or 0-18 [[magical contamination|glow]] (1/5)
 
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*3: longer polymorph (1/2 chance), 3-20 damage plus 0-34 [[magical contamination|glow]] (1/6), 5-27 damage plus remove mutation (1/6), 5-27 damage plus 1-2 bad mutations (1/6)
 
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==Hell effects==
 
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[[Hell]]'s mystical force selects a miscast or other effect with the probabilities given below.  As noted further down, it will always try to place a Malign Gateway instead of banishing, as banishment is rarely more than annoyance for a character that can handle Hell.
 
 
*[[Miscast_effect#Necromancy|Necromancy]] miscast: 16.66%
 
*[[Miscast_effect#Necromancy|Necromancy]] miscast: 16.66%
 
*[[Miscast_effect#Summonings|Summonings]] miscast: 8.33%
 
*[[Miscast_effect#Summonings|Summonings]] miscast: 8.33%

Revision as of 07:23, 31 August 2020

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

A miscast effect occurs when a player fails to cast a spell successfully. These can range in severity from completely harmless to inflicting heavy damage and magic contamination, depending on the school of magic that is used.

A miscast will first cause contamination based on the severity of the failure and the spell level. Then an additional effect will be applied based on the spell school. If a spell has multiple schools, the additional effect will be chosen among them at random.

School Additional Effect
Air Magic electricity damage
Conjurations irresistible damage
Earth Magic shrapnel damage
(reduced by AC three times)
Hexes debuff and slow <damage> turns
Charms debuff and slow <damage> turns
Fire Magic fire damage
Ice magic cold damage
Necromancy draining damage
Poison Magic poison damage
Summonings durably summoned
nameless horror
HD = 2 * <damage> / 3
Translocations Dimension Anchor <damage> turns
Transmutations double current contamination
then add 9 * <damage> contamination

There is a special case if Hell's mystical force produces a miscast effect that spawns any monsters: those monsters are not summons and are worth experience.

Displayed in game spell failure rate color indicates the maximum damage of the additional effect relative to your current max HP. These are calculated as if the damage is irresistible, even for those schools whose miscast effects are resistible or not directly damaging.

Color Potential
HP Loss 		Warning
Description
Grey 0% safe
White 10% slightly dangerous
Yellow 30% dangerous
Light red 50% quite dangerous
Red 70% extremely dangerous
Purple 100% potentially lethal


Hell effects

Hell's mystical force selects a miscast or other effect with the probabilities given below. Hell effects only apply the additional effect of the specific spell school, not the initial contamination.

Notes


See Also

Magic contamination

History

  • In 0.25, the miscast effect system will be significantly simplified, and many mechanics that generated miscast effects (such as divine wrath) will instead use their own unique code.
  • In 0.16, many magic miscast effects received a significant overhaul.
  • Prior to 0.14, Hell's mystical force could paralyze the player.
  • Prior to 0.13, Zot traps inflicted a random severity 3 miscast, instead of having a hardcoded list of effects.
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