Item
Items are ingame objects that can be picked up and placed into an inventory. Examples of items include equipment, currency, flasks, jewels, skill gems, waystones, and fragments.
Items can have a rarity and a quality.
Item rarity tier system Unidentified item tiers: Items can drop unidentified with a "tier" from 2-5 the higher this number the higher the mods will have rolled on the item when you identify it. This can be helpful when filtering for items as it can indicate the potential for better mods.
Corrupted
Corrupted items cannot be altered further through regular crafting methods. The process of making something corrupted is referred to as corruption, which cannot be reversed.
Mirrored
Mirrored items represent copies of the original and cannot be modified by most crafting methods. Mirrored items can be creating by using a 
Mirror of KalandraMirror of KalandraStack Size: 10Creates a Mirrored copy of an itemRight click this item then left click an equipable non-unique item to apply it. Mirrored copies cannot be modified.
on a non-mirrored item.