dam_multiply is some parameter which changes mob's damage of hits and skills. It works like this simple example:
Total damage = (st + dx + [..other parameters..] + max_damage) * dam_multiply
About second question I can't say exactly, but you must change 'rank' column in mob_proto. Values 0, 1, 2 and 3 don't have chance to drop yang bombs.
Sorry for bad english. With best regards.
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