Alternate items
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Version 0.29: This article may not be up to date for the latest stable release of Crawl.
Alternate items, also known as item sets, are a mechanic used to implement two similar, but seperate items. Items within a given set are mutually exclusive; only one will spawn in any given game. Backgrounds ignore this mechanic and will come with the same items no matter if they actually spawn in the dungeon proper.
Scrolls
Concealment - hinder enemy attack