robust mutation while divine robustness is in effect.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4949 c06c8d41-db1a-0410-9941-cceddc491573
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hitp *= (10 + player_mutation_level(MUT_ROBUST)
+ you.attribute[ATTR_DIVINE_ROBUSTNESS]
- player_mutation_level(MUT_FRAIL));
hitp *= (10 + robust - player_mutation_level(MUT_FRAIL));