The reforging system was planned to work differently, it was originally going to use ores/items dropped from mobs to give certain stats to items, like increased speed,knockback,damage or adding effects to inflict debuffs, like frostburn,flaming,ichor,etc... but as the modding went on it was left as a experimental state which is the reforging there it is in NT5, if possible, I would like to nakano try it going back to the original idea of not increasing just the rarity and with it all the stats, but using the materials to increase each stats until a limited ammount.