each turn.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8817 c06c8d41-db1a-0410-9941-cceddc491573
JSODDAQIE6WN3C4KMW2OUCVRRPHHPIZR5KO7V27CKELMCT23XEKQC
* miscasts: Every turn each monster (besides test spawners) will have a
random miscast happen to it.