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World of Warcraft Item Upgrades The upgrade of an item can be used to increase the stats of an item. Depending on the type of upgrade you choose, it can increase 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 item by a certain amount. Item Level The value of an item's basic stats increases as it is upgraded. This value is the sum of an item's le