So, I've been doing Barrows lately, and I've come to a conclusion. I'm pretty sure most experienced Barrowers have already known this, but I wanted to confirm this hunch, and I'm too lazy at the moment to be bothered reading a Barrows guide to check it out. So, my hunch is this: Each monster you kill has a drop, just like every other monster in the game. But, instead of dropping it on the ground, it drops it into the chest. No? That would explain why the higher your kill count, the more runes you'll get. And it also explains why a higher kill count does not increase your chances of getting a Barrows item, because you've only killed each brother once; therefore limiting the chance of getting a Barrows item to just those six brothers. And, as a sidenote, it explains double-drops of Barrows stuff. So, is this correct? I think so, but let me know. Off to do more Barrowing!