been watching this waiting, a thought on refighting special enemys... i have seen some games have a bounus room that is usualy post game that has a bunch of npcs that represent an enemy with a prompt that asks if you want to fight [enemy name], could that be useful? if your worried about useless key items clogging the players inventory, why not turn them in for prize redemption like pachinko... or make a duplicate verson of the monster that is called that drops no exp or items.