Spread the light, my child.

Clear

Henzell says...

{acid} among other effects may inflict the debuff "Corr". When something attempts to corrode you, it has a Corr_level/(Corr_level+7) chance to fail. Each level of Corr reduces your AC by 4 and gives -4 slaying. Goes away after enough time has passed. Corr(-4) means -4 slaying/-4 AC. Monsters get a non-stacking -8 ac, and have a 2/3 chance to be corroded when splashed.

Information based on master branch and the great LearnDB.
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