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| − | When '''[[spellcasting]]''' the '''Fail''' column appears in the menu which occurs when using the '''[Z]''' [[commands|command]].
| + | #redirect [[Spellcasting#Calculating_spell_success_rate]] |
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| − | To calculate [[spell]] '''failure''', you first need to sum together the penalties marked with a number sign (#) below. An increasing total penalty is worse for spellcasting, and is limited to a maximum of 20.
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| − | * The "BASE" value from the table below, depending on the character's class.
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| − | * If an "[[emergency]]" spell (noted with a + above), the "EMERG" field.
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| − | * If wearing any [[shield]], the amount in the "SHIELD" field.
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| − | * If wearing metallic [[armor|body armor]], the amount in the "SUIT" field.
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| − | * If also wearing a [[robe]], only add half the amount (rounded down).
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| − | * If wearing a robe without metallic armour, *subtract* the amount in the "SUIT" field.
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| − | * If wearing a metallic [[helmet]] other than the [[helm of brilliance]], add 4.(Metal helmets interfere with the mind.)
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| − | * Metallic [[gloves]] add 6 (casting channels through the hands).
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| − | * Metallic [[boots]] add 2 (all metal interferes to some degree).
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| − | * Add -4 if the spell is [[special spell|special]] to that class (see table).
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| − | CLASS BASE EMERG SHIELD SUIT STAT SPECIAL SPELL
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| − | Arc 5# 0# 2# 10# Int Magic mapping
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| − | Bar 14# 0# 0# 8# Int Haste self
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| − | Cav 12# 0# 1# 8# Int Dig
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| − | Hea 3# -3# 2# 10# Wis Cure sickness
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| − | Kni 8# -2# 0# 9# Wis Turn undead
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| − | Mon 8# -2# 2# 20# Wis Restore ability
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| − | Pri 3# -2# 2# 10# Wis Remove curse
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| − | Ran 9# 2# 1# 10# Int Invisibility
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| − | Rog 8# 0# 1# 9# Int Detect treasure
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| − | Sam 10# 0# 0# 8# Int Clairvoyance
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| − | Tou 5# 1# 2# 10# Int Charm monster
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| − | Val 10# -2# 0# 9# Wis Cone of cold
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| − | Wiz 1# 0# 3# 10# Int Magic missile
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| − | Next, calculate a base chance of success, which is 5.5 times your
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| − | intelligence or wisdom STAT, depending on your class. This chance is
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| − | modified by the following factors:
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| − | * SKILL level (Unskilled = 0, Basic = 1, Skilled = 2, Expert = 3)
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| − | * spell level (LVL)
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| − | * experience level (XL)
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| − | according to this formula:
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| − | difficulty = (LVL * 4) - (SKILL * 6) - (XL/3) - 5
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| − | If this is positive, your chance is reduced according to another formula:
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| − | chance = base chance - square root of ((900 * difficulty) + 2000)
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| − | If it is negative, it will be increased with diminishing returns: the
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| − | absolute value is multiplied by (15/LVL), capped at 20, and added to
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| − | the base chance.
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| − | The resulting chance is clipped to the range of 0% to 120% success. If
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| − | you are wearing a shield larger than a small shield, the chance is then
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| − | reduced to 1/4 its amount (except if it is the special spell for your
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| − | class -- then it is only halved).
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| − | Finally, the chance of success is adjusted by your total penalty using
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| − | the following formula:
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| − | chance = (chance * (20-penalty) / 15) - penalty
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| − | The result is clipped to the range of 0% to 100% success.
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| − | ----
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| − | {{DOD}}
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| − | [[Category:Spellcasting]]
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