git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4424 c06c8d41-db1a-0410-9941-cceddc491573
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// by two for MP.
// roughly in half for MP.
int mp_amount = (pow + roll_dice(2, pow) - 2) / 2;
int mp_amount = (pow + roll_dice(2, pow) - 2) / 2 + 1;