Spellcasting failure probabilities

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Your ability with a spell is represented textually by Crawl, but the relative rankings at the bottom end are not very intuitive. Here are the rankings in order:

RankingSpell failure
Useless>100
Terrible91-100
Cruddy81-90
Bad71-80
Very Poor61-70
Poor51-60
Fair41-50
Good31-40
Very Good21-30
Great11-20
Excellent1-10
Perfect<0

The 'spell failure' number is compared to 3d100/3 in order to determine whether the spell attempt fails or not. Thus a 'Poor/Fair' spell will succeed roughly 50% of the time, an 'Excellent' spell will succeed 99.9% of the time and a 'Terrible' spell will almost always fail.

   
   
 

Copyright (C) Mark Mackey 2001