Add short duration freezing cloud for high-damage cold beams (bolt of cold at reasonable power).

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6644 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on July 23, 2008
WNUKUYBBSIL7AUP4XJAGUFMKBBMZ7QY5DS67OVI7JSPAUOAZJV3AC
In channels
main
Change contents