Either leave it alone or decrease the critical hit time by half so you have to get the 3 hits quicker for the white nail to work. It would make it a more skill based weapon and I think people wouldn't be as pissed if they didn't get the ammo because they couldn't get 3 shots quick enough.
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yeah but the issue with the black hammer is boss fights. for things like the nexus, it would still just chew threw it in no time with very little skill involved. so I don't think that would work