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World of Warcraft - Item Upgrading The upgrade of an item lets players boost the gear rating of an item up to 700 points and give it a bonus. Items can be upgraded by keeping them in inventory, and then taking them to the kiln. Certain items can be upgraded to increase their stats (like an ideally rolled breakpoint armour used in melee PvP) while others like weapons don't change much post upgrade, and therefore aren't worth upgrading. Weapons Upgrades to weapons can increase their numerical