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World of Warcraft - Item Upgrading The upgrade of an item allows players to boost the gear rating of an item by up to 700 points and give it a bonus. Items can be upgraded by having them in inventory and heading to the kiln. Certain items are worth upgrading because of their distinctive stats. (For example an excellently rolled breakpoint armor used in melee PvP). Other items such as weapons don't really change after an upgrade and aren't worth the effor