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World of Warcraft Item Upgrades The upgrade of an item can be used to increase the stats of an item. Based on the type of upgrade you choose, it can boost the rarity of an item, or its Mark Level, and also boost other stats. Each item has a track for upgrading it. Each upgrade increases the cost of the next one by a certain amount. Item Level The value of an item's base stats increase when it is upgraded. This is the sum of all of an item's leveled-up perks (attack magic attack and defense). U