It's a gamblers mod. I'm pretty sure it works more like every attack you roll a figurative 5 sided dice, you could get lucky and consistently sunder every attack( or a figurative 10 sided dice for the furious) or you could crap out and never hit it. It's not necessarily every 5 hits you will get the sunder. Either way Vamp is sure fire extra pain.
I will say, using a furious mod, I tend to get the bonus a lot, even with the wide margin of failure. Stuff charges a lot faster then it should. It's what made me reconsider a sundering weapon and I'm liking the results.
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