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Blackjack
Blackjack checks headgear now. I'm not sure if the staff has said what exactly is the key factor (material, level, AC, etc.) I think the key factor is material, but it might be AC instead. There is also the "remain conscious" edge, which (slightly) reduces your chances of being knocked out by blackjack (and lots of other things). The stuff pertaining to "Evade" also applies here, just like for any other skill. If you're a warrior, there's also the "Place of the Raging River" legacy, but the help file makes it sound like it's based on intelligence, so it may not be appropriate for "dumb" races. I think one of the Invoker "greater shields" may also render them either immune, or resistant, to blackjack. (Shield of Fire, maybe?)
In this instance wouldn't AC be the most logical assumption? The more protected the head is - lower the armor class - the less likely you are to be able to smack someone unconscious on the back of the head.
Alternately, with drum, the harder the material of the armor the less likely you are to be able to put a dent in it. Just like with weaponbreaker and destroying weapons.
Am I spouting complete nonsense? Does anyone actually know the correct answer?