TIL there's a method to the madness of dungeon chest loot. It's based on distance from the entrance. The first chest will always have a muramasa, unless it generates above 0 feet. The next one has a cobalt shield, then an aqua scepter, then a blue moon, then a magic missile, then the valor. After that it'll be a wooden chest with a gold key, and then finally a handgun. After that it goes through the list again.