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World of Warcraft Item Upgrades The upgrade of an item can be used to boost the stats of a particular item. Based on the type of upgrade it can raise an item's Mark level or Rarity and boost additional stats. Each item comes with a track for upgrading it. Each upgrade increases the cost of the following one by a certain amount. Item Level The value of an item's basic stats increases when it is upgraded. The value is the sum of all of the perks that are leveled up (attack magic attack and defense).