Necromancy books, plus the book of Demonology.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3518 c06c8d41-db1a-0410-9941-cceddc491573
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K2CS6TCX2NDVL2ASEHGP4J4K4IJ6FP3ANNKTSIWVG43HPYSBX6ZQC
case OBJ_BOOKS: retval = (item.sub_type == BOOK_NECROMANCY || item.sub_type == BOOK_DEATH || item.sub_type == BOOK_UNLIFE || item.sub_type == BOOK_NECRONOMICON || item.sub_type == BOOK_DEMONOLOGY); break;
case OBJ_BOOKS:
retval = (item.sub_type == BOOK_NECROMANCY
|| item.sub_type == BOOK_DEATH
|| item.sub_type == BOOK_UNLIFE
|| item.sub_type == BOOK_NECRONOMICON
|| item.sub_type == BOOK_DEMONOLOGY);
break;