Fail

When spellcasting the Fail column appears in the menu which occurs when using the Z command.

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.

• The "BASE" value from the table below, depending on the character's class.
• If an "emergency" spell (noted with a + above), the "EMERG" field.
• If wearing any shield, the amount in the "SHIELD" field.
• If wearing metallic body armor, the amount in the "SUIT" field.
• If also wearing a robe, only add half the amount (rounded down).
• If wearing a robe without metallic armour, subtract the amount in the "SUIT" field.
• If wearing a metallic helmet other than the helm of brilliance, add 4.(Metal helmets interfere with the mind.)
• Metallic gloves add 6 (casting channels through the hands).
• Metallic boots add 2 (all metal interferes to some degree).
• Subtract 4 if the spell is special to that class (see table).

CLASS	BASE	EMERG	SHIELD	SUIT	STAT	SPECIAL SPELL
Archeologist	5#	0#	2#	10#	Int	Magic mapping
Barbarian	14#	0#	0#	8#	Int	Haste self
Caveman	12#	0#	1#	8#	Int	Dig
Healer	3#	-3#	2#	10#	Wis	Cure sickness
Knight	8#	-2#	0#	9#	Wis	Turn undead
Monk	8#	-2#	2#	20#	Wis	Restore ability
Priest	3#	-2#	2#	10#	Wis	Remove curse
Ranger	9#	2#	1#	10#	Int	Invisibility
Rogue	8#	0#	1#	9#	Int	Detect treasure
Samurai	10#	0#	0#	8#	Int	Clairvoyance
Tourist	5#	1#	2#	10#	Int	Charm monster
Valkyrie	10#	-2#	0#	9#	Wis	Cone of cold
Wizard	1#	0#	3#	10#	Int	Magic missile

Next, calculate a base chance of success, which is 5.5 times your intelligence or wisdom STAT, depending on your class. This chance is modified by the following factors:

• SKILL level (Unskilled = 0, Basic = 1, Skilled = 2, Expert = 3)
• spell level (LVL)
• experience level (XL)

according to this formula:

difficulty = (LVL * 4) - (SKILL * 6) - (XL/3) - 5

If this is positive, your chance is reduced according to another formula:

chance = base chance - square root of ((900 * difficulty) + 2000)

If it is negative, it will be increased with diminishing returns: the absolute value is multiplied by (15/LVL), capped at 20, and added to the base chance.

The resulting chance is clipped to the range of 0% to 120% success. If you are wearing a shield larger than a small shield, the chance is then reduced to 1/4 its amount (except if it is the special spell for your class -- then it is only halved).

Finally, the chance of success is adjusted by your total penalty using the following formula:

chance = (chance * (20-penalty) / 15) - penalty

The result is clipped to the range of 0% to 100% success.

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This page is based on a spoiler by Dylan O'Donnell. The original license is:

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