Wizardry

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Wizardry refers to items and effects that directly reduce your chance of failure when casting spells. These are provided by:

Rings of wizardry (+3)
Staves of wizardry (+4)
Quaffing a potion of brilliance provides a temporary wizardry bonus (+6)

In addition, certain sources provide a wizardry-like reduction of failure rate (by 1/3) that stacks with wizardry:

Vehumet provides a bonus to destructive spells for sufficiently pious worshipers not under penance
Potions of brilliance

All of these sources stack but very weakly; the first 3 points of wizardry are about as good as the next 9. In no case can failure rate be reduced by better than half using wizardry. Notice that a potion of brilliance will reach the one-half cap by itself.

See also