I don't think we're discussing the same thing here...
There is an exploit where you can "respawn" a boss right in front of you by abusing the layering system, which, from the instructions I've seen floating around the internet, is more involved than resetting a dungeon. You can literally stay locked inside of a boss room and farm them non-stop, without having to re-clear anything leading up to them—just pick the boss that drops the thing you want, farm them endlessly until they do, and then move onto the next.
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