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Trunk-only: This article pertains to a feature of Crawl which is being tested. It will likely change before the next release, and may even be removed entirely.
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If an M_CAUTIOUS monster doesn't opt to cast a spell that turn (or use a wand, reaching attacking, etc.) but had a valid spell it could have cast, and is not already in melee range of something, it has a 2/3 chance to wait in place instead of moving forward. It's similar to having a cantrip that the monster won't ever use in place of attacking.