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World of Warcraft Item Upgrades Upgrades to items can be used to improve the stats of a particular item. Based on the type of upgrade it could boost an item's Mark Level or Rarity and boost additional stats. Each item has a track to upgrade it. Each upgrade increases the cost of the next one by a specific amount. Item Level The value of an item's stats base increase when it is upgraded. This is the sum of the perks that are leveled up (attack magic attack and defense). Upgrades can be expensive dependent on who you employ and what you decide