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Version 0.31: This article is up to date for the latest stable release of Dungeon Crawl Stone Soup.

Wizardry refers to items and effects that directly reduce your chance of failure when casting spells. These are provided by rings and the demonspawn mutation Big Brain.

If you have at least one source of wizardry, your raw spell failure is multiplied by 6 / (7 + sources). This is applied after calculating spell failure from skills and other modifiers, though failure is modified by a further modifier. There is no limit to the number of wizardry you can have.

If you worship Vehumet, the raw spell failure of destructive spells is further multiplied by 2/3. This is roughly equivalent to 2 sources of wizardry if don't have any. Note that this bonus is not considered as 2 sources of wizardry; it is a multiplier applied after wizardry is calculated.

Wizardry Raw Fail Multi. Wizardry Raw Fail Multi.
Wizardry x1 75%
Wizardry x2 66.67% Vehumet 66.67%
Wizardry x3 60% Vehumet + Wiz x1 50%
Wizardry x4 54.55% Vehumet + Wiz x2 44.4%
Wizardry x5 50% Vehumet + Wiz x3 40%

Generally, the actual decrease to failure rate will be larger than the raw decrease.[1] For example, wizardry x1 will bring actual failure rates from 80% -> 45% (×56%), 50% -> 22% (×44%), or 15% -> 6% (×37.5%).

See Also


  • Prior to 0.31, there was a raw failure multiplier cap of 50%. This meant you could only have 5 sources of wizardry apply at once, or Vehumet and 1 source of wizardry.
  • Big Brain was introduced in 0.27.
  • Prior to 0.26, staves of wizardry existed, which gave a rank of wizardry.
  • Prior to 0.25, potion of brilliance provided a temporary wizardry bonus.
  • Prior to 0.14, a staff of wizardry granted a better wizardry bonus than a ring of wizardry.


  1. This is true, at the very least, when your (post-wizardry failure rate) < 50%. The smaller the failure, the smaller the % multiplier (keep in mind that it is a multiplier).