I would actually disagree on the Kirkhammer, given the context on why it's designed the way it is. The Church made weapons like the Kirkhammer specifically in response to colossal enemies like the cleric beasts, against which conventional weapons look like more of a painful annoyance than a lethal threat. Sure using a big mallet like the Kirkhammer would be terribly ineffective against smaller targets compared to a normal warhammer, but normal sized warhammers are designed to kill human sized opponents. Sure it can more effectively damage whatever it hits, but that's not going to mean a whole lot when that damage is inflicted to a small part of a creature that's two stories tall. For example if you hit the knee of a cleric beast with a warhammer: Sure it'll hurt, you probably shattered a decent portion of its bone, but it's probably still standing. You just chipped off half of the kneecap and made it mad, maybe caused it to stumble a bit. Meanwhile with the Kirkhammer you're basically swinging a boulder around. It's a lot heavier, and because of that when it hits it's not going to stop as easily as the warhammer would have. I can't imagine any outcome other than the probably lighter knee giving way to such a massive weight being slammed into it, practically snapping the joint in half and forcing the beast to kneel.