https://telegra.ph/What-Is-The....-Reason-Why-Item-Upg
World of Warcraft - Item Upgrading The upgrade option lets players increase an item's gear rating up 700 points and also add a final bonus. Items can be upgraded if they're in your inventory and you bring them to the Kiln. Certain items are worth upgrading because of their distinctive stats. (For instance the perfect broken point armor that is rolled can be used in melee PvP). Other items such as weapons don't really change after an upgrade and aren't worth the cost. can be upgraded