Each weapon "instance" has a default tier. So we might have say 20+ knives, with a fairly even distribution of knives per tier. So let's just say that there are 2 knives at tier 0, 2 knives at tier 1, etc. Then once we start adding the randomized property terms (prefixes and suffixes like Diablo), those terms will modify the weapon's tier up or down, depending on whether the random property is improving the weapon or making it worse. In the sub-menu ZillieZephyr (Matt) is working on, it will show the aggregate final tier of the weapon (all random properties included) so you have a general baseline for weapon quality / rarity / power and comparison to other weapons. We'll also show a lot of other stats so you can know how the weapon will behave. It will be a while before this menu is finished though - probably March-ish.