Make the chance of getting an intact enslaved soul from Yred dependent

on Invocations skill instead of straight 50%.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10233 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on July 16, 2009
QSSBY2L2FO3QV77ODEFPGZ63NSE7KACQ5SKCH2WGFB7DXKUHT7EQC
Change contents