Difference between revisions of "Magic points"

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'''Magic points''' or '''Mana points''' (usually abbreviated to MP) is the amount of magical energy which a given character has. It is used for spellcasting, for invoking divine powers (with the exception of [[Trog]]) and for evoking abilities granted by worn items, mutations, and intrinsic abilities.
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'''Magic points''' or '''Mana points''' (usually abbreviated to MP) is the amount of magical energy which a given character has. It is used for spellcasting, and for invoking divine powers, mutations, and intrinsic abilities. Having your MP fall to zero is not lethal, though you won't have any MP to use on abilities.
  
Having your MP fall to zero is not directly lethal, but can be very hazardous for a spellcaster. MP will regenerate up to your maximum with time, and it is often recommended that spellcasters should rest up to full MP after every fight.
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Every spell uses <code>(Spell Level)</code> MP per cast. Other types of abilities can have their own cost, usually ranging from 1 to 10 MP per use.
  
Some items like [[ring of magical power|rings of magical power]] or [[staff of power|staves of power]] can increase a given character's reserves of magical power.
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Your base maximum MP is a function of your experience level, your species, and the either 1. your [[Spellcasting]] skill, or 2. half of your [[Invocations]] skill (The higher of the two; Spellcasting skill is twice as effective as Invocations for MP). Some items like [[ring of magical power|rings of magical power]] or [[artefacts]] with the {MP+} property can increase a given character's reserves of magical power.
  
Your maximum MP without benefit of items is a function of your experience level, your race, and whichever of your [[Spellcasting]], [[Evocations]], and [[Invocations]] skill is higher. Training Spellcasting provides twice as much MP as Invocations or Evocations. Depending on your character, though, this may not be a concern.
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A typical character starts with 0-7 MP (e.g. 0 for a Minotaur Fighter, 7 for Deep Elf Hedge Wizard) and eventually grows to many times that (30-40 for a level 20 Mummy Necromancer, or 50-60 when using extra items).
  
A typical character starts with 0-7 MP (e.g. 0 for a Minotaur Fighter, 6 for Deep Elf Conjurer, 7 for Deep Elf Wizard) and eventually grows to many times that (30-40 for a level 20 Mummy Necromancer, or 50-60 when using extra items).
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[[Djinn]] do not use MP. Whenever they would spend MP, they spend HP instead; otherwise, they are unaffected by any mechanic that involves MP.
  
 
==Strategy==
 
==Strategy==
MP is a very important stat for spellcasters. Early or mid game rings of magical power are extremely useful, since MP costs are low and your base mana pool is small. However, as your MP hits around the 40+ mark, the efficiency of this stat gets drastically lower. Perhaps the only source of MP that you should use at this point is a staff of magical power, but even that could be replaced by an enhancer staff if you find one appropriate for you.
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MP is a very important stat for spellcasters. Early- or mid-game rings of magical power are extremely useful, since MP costs are low and your base mana pool is small. However, as your MP hits around the 40+ mark, the value of +9 MP decreases.
  
 
Methods of MP restoration:
 
Methods of MP restoration:
 
 
*Resting.
 
*Resting.
*Consumables: The [[potion of magic]] recovers a decent amount of magic with no downsides. [[Potions of ambrosia]] offer significant HP and MP regen for a duration but confuses you for the entirety of it; if you cure the confusion, the ambrosia will end too.
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*Consumables: [[Potions of magic]] recover a decent amount of magic, but are rare. [[Potions of ambrosia]] offer significant HP and MP regeneration for a duration, but confuses you for the entirety of it; if you cure the confusion, the ambrosia will end too.
*Casting [[sublimation of blood]], which restores your MP at the cost of your own health. (Remember to save 2 MP for this!)
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*Casting [[Sublimation of Blood]], which restores your MP at the cost of your own health. (Remember to save 2 MP for this!)
*Wearing an [[Amulet of magic regeneration]].
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*Wearing an [[amulet of magic regeneration]].
 
*God abilities: [[Ru]], [[Sif Muna]], [[Gozag]], and [[Nemelex]] offer ways to actively recover your mana, with varying degrees of reliability.
 
*God abilities: [[Ru]], [[Sif Muna]], [[Gozag]], and [[Nemelex]] offer ways to actively recover your mana, with varying degrees of reliability.
*God passives: [[Vehumet]] lets you recover MP when killing monsters. [[The Shining One]] offers a similar power that only works against unholy and demonic enemies. Worshipers of [[Jiyva]] can recover MP when slimes consume items.
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*God passives: [[Vehumet]] lets you recover MP when killing monsters. [[The Shining One]] offers a similar power that only works against unholy and demonic enemies. Worshipers of [[Jiyva]] recover MP unusually quickly.
*Evocable items. [[Staves of energy]] can be evoked for a chance to regenerate a little MP. [[Crystal balls of energy]] and the [[Staff of Wucad Mu]] can let you recover significant amounts of MP per turn, but with a chance of backfiring.
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*[[Channeling]] items: An [[orb]] of [[energy]] or the [[Staff of Wucad Mu]] may refund MP you spend, but with a chance of backfiring.
 
*Biting an enemy as a [[Vine Stalker]].
 
*Biting an enemy as a [[Vine Stalker]].
*Being a [[demonspawn]] can grant you access to the spirit shield mutation series, which will grant you improved MP regeneration, especially when you are low on MP (at the cost of your health regeneration), or can grant you the powered by pain mutation which could restore some MP when you take damage. Or you could get both.
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*Being a [[demonspawn]] can grant you access to the [[Mana Shield]] mutations, which will grant you improved MP regeneration, especially when you are low on MP. The [[Powered by Pain]] mutations might replenish MP whenever you take damage. Or you could get both.
  
 
==Formula==
 
==Formula==
* Highest Skill = max(Spellcasting, Invocations/2, Evocations/2)
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* Highest Skill = max(Spellcasting, Invocations/2)
 
* MP = Scale*(min(XL, 23) + Highest Skill + min(8, Highest Skill, XL)/2) + Species Modifier
 
* MP = Scale*(min(XL, 23) + Highest Skill + min(8, Highest Skill, XL)/2) + Species Modifier
 
* Sources of MP scaling:
 
* Sources of MP scaling:
 
**[[Good_mutations#High MP|High MP mutation]]: +10% per level
 
**[[Good_mutations#High MP|High MP mutation]]: +10% per level
 
**[[Bad_mutations#Low_MP|Low MP mutation]]: -10% per level
 
**[[Bad_mutations#Low_MP|Low MP mutation]]: -10% per level
**[[Elyvilon]]'s [[Divine vigour]]: +50%
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**[[Elyvilon]]'s [[Divine vigour]]: up to +50%
 
* Sources of flat MP bonuses (applied after scaling):
 
* Sources of flat MP bonuses (applied after scaling):
**[[ring of magical power|Rings of magical power]]: +9 MP
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**[[ring of magical power|rings of magical power]]: +9 MP each
**[[Maxwell's etheric cage]]: +4 MP
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**[[artefact]]s with the {+MP} property: usually +9 each -- may vary for some [[unrand]]s
**[[staff of power|Staves of power]]: +15 MP
 
 
*Wielding a weapon of [[antimagic]] divides MP by 3. This is applied after all other modifiers.
 
*Wielding a weapon of [[antimagic]] divides MP by 3. This is applied after all other modifiers.
  
 
==MP modifiers==
 
==MP modifiers==
 
 
From [[Dungeon Crawl]] [[Stone Soup]] in-game documentation:
 
From [[Dungeon Crawl]] [[Stone Soup]] in-game documentation:
 
{{#invoke:Apt|skill_table|Magic Points}}
 
{{#invoke:Apt|skill_table|Magic Points}}
Line 46: Line 43:
  
 
==History==
 
==History==
[[0.17]] simplified MP calculations. The base formula was:
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*Prior to [[0.26]], [[Evocations]] increased max MP.
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*[[0.17]] simplified MP calculations. The base formula was:
 
  XL + Permanent MP + (XL*Species modifier + 1)/3 + (XL*Species modifier + 1)/3 + max(Spellcasting*XL*3/14 + Spellcasting, Invocations*XL/6.5 + Invocations/3, Evocations*XL/6)
 
  XL + Permanent MP + (XL*Species modifier + 1)/3 + (XL*Species modifier + 1)/3 + max(Spellcasting*XL*3/14 + Spellcasting, Invocations*XL/6.5 + Invocations/3, Evocations*XL/6)
  
 
Then a stepdown function was applied and MP was capped at 50. Species aptitudes used to be multiplicative, but are now additive.
 
Then a stepdown function was applied and MP was capped at 50. Species aptitudes used to be multiplicative, but are now additive.
  
Before [[0.14]], the formula was:
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*Before [[0.14]], the formula was:
 
  Unscaled MP = XL + Permanent MP + (XL*Species modifier + 1)/3 +
 
  Unscaled MP = XL + Permanent MP + (XL*Species modifier + 1)/3 +
 
  max(Spellcasting*XL/4, Invocations*XL/6, Evocations*XL/6)
 
  max(Spellcasting*XL/4, Invocations*XL/6, Evocations*XL/6)

Latest revision as of 13:45, 16 June 2023

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

Magic points or Mana points (usually abbreviated to MP) is the amount of magical energy which a given character has. It is used for spellcasting, and for invoking divine powers, mutations, and intrinsic abilities. Having your MP fall to zero is not lethal, though you won't have any MP to use on abilities.

Every spell uses (Spell Level) MP per cast. Other types of abilities can have their own cost, usually ranging from 1 to 10 MP per use.

Your base maximum MP is a function of your experience level, your species, and the either 1. your Spellcasting skill, or 2. half of your Invocations skill (The higher of the two; Spellcasting skill is twice as effective as Invocations for MP). Some items like rings of magical power or artefacts with the {MP+} property can increase a given character's reserves of magical power.

A typical character starts with 0-7 MP (e.g. 0 for a Minotaur Fighter, 7 for Deep Elf Hedge Wizard) and eventually grows to many times that (30-40 for a level 20 Mummy Necromancer, or 50-60 when using extra items).

Djinn do not use MP. Whenever they would spend MP, they spend HP instead; otherwise, they are unaffected by any mechanic that involves MP.

Strategy

MP is a very important stat for spellcasters. Early- or mid-game rings of magical power are extremely useful, since MP costs are low and your base mana pool is small. However, as your MP hits around the 40+ mark, the value of +9 MP decreases.

Methods of MP restoration:

  • Resting.
  • Consumables: Potions of magic recover a decent amount of magic, but are rare. Potions of ambrosia offer significant HP and MP regeneration for a duration, but confuses you for the entirety of it; if you cure the confusion, the ambrosia will end too.
  • Casting Sublimation of Blood, which restores your MP at the cost of your own health. (Remember to save 2 MP for this!)
  • Wearing an amulet of magic regeneration.
  • God abilities: Ru, Sif Muna, Gozag, and Nemelex offer ways to actively recover your mana, with varying degrees of reliability.
  • God passives: Vehumet lets you recover MP when killing monsters. The Shining One offers a similar power that only works against unholy and demonic enemies. Worshipers of Jiyva recover MP unusually quickly.
  • Channeling items: An orb of energy or the Staff of Wucad Mu may refund MP you spend, but with a chance of backfiring.
  • Biting an enemy as a Vine Stalker.
  • Being a demonspawn can grant you access to the Mana Shield mutations, which will grant you improved MP regeneration, especially when you are low on MP. The Powered by Pain mutations might replenish MP whenever you take damage. Or you could get both.

Formula

  • Highest Skill = max(Spellcasting, Invocations/2)
  • MP = Scale*(min(XL, 23) + Highest Skill + min(8, Highest Skill, XL)/2) + Species Modifier
  • Sources of MP scaling:
  • Sources of flat MP bonuses (applied after scaling):
  • Wielding a weapon of antimagic divides MP by 3. This is applied after all other modifiers.

MP modifiers

From Dungeon Crawl Stone Soup in-game documentation:

At Ba DE Dg Ds Dj Dr Fe Fo Gr Gh Gn HO Hu Ko Mf Mi Mu Na Op On Sp Te Tr Vp VS
0 0 2 2 0 N/A 0 1 0 0 -1 0 0 0 0 0 -1 0 0 0 0 1 1 -1 0 1

Demigods additionally start with the High MP mutation.

History

  • Prior to 0.26, Evocations increased max MP.
  • 0.17 simplified MP calculations. The base formula was:
XL + Permanent MP + (XL*Species modifier + 1)/3 + (XL*Species modifier + 1)/3 + max(Spellcasting*XL*3/14 + Spellcasting, Invocations*XL/6.5 + Invocations/3, Evocations*XL/6)

Then a stepdown function was applied and MP was capped at 50. Species aptitudes used to be multiplicative, but are now additive.

  • Before 0.14, the formula was:
Unscaled MP = XL + Permanent MP + (XL*Species modifier + 1)/3 +
max(Spellcasting*XL/4, Invocations*XL/6, Evocations*XL/6)

where Permanent MP was a constant determined by the player's background and species.