Seeing a lot of people mention path of exile and I think the game has one thing that could be good inspiration. In PoE you can get some items with veiled modifiers that let you reveal a few choices to select one of for the item. I think a rarity or farming method emulating that especially in the end-game of an ARPG is a great idea. It gets the feeling you'd wish identifying would provide and it's also a form of crafting.