missile individually, as we do with Nemelex already. Also, increase the value of large rocks; they're mundane, but they do massive damage, so they should be worth more than ordinary darts or stones.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9787 c06c8d41-db1a-0410-9941-cceddc491573
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