@Aichan the whole concept is pretty ... weird. Since food is all gotten from dungeons, there aren't any farmers, butchers, regular hunters, etc. And as far as our world is concerned, it was agriculture/livestock that allowed humanity to develop to the point of creating proper societies, since it allowed us to produce that much more food. So in this manga, something like 70-80% of the population would have to be adventurers hunting for food. But then the whole droprate thing makes it weird.
How do they even supply armies with food?
The whole concept seems rather flawed.
On a chapter-related topic; I'm wondering if having multiples of those rings would allow the effects to stack, giving a person S rank in all droprates.