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World of Warcraft Upgrades and Item Upgrading Upgrades can boost the value of certain numeric stats on weapons, armor and rings. Upgrades can also boost bonuses like Crit chance and PvE Damage. For instance an item with the upgrade template that ends in % will gain 3% attack damage every time it upgrades (relative to its previous value). Item upgrading costs crests and the item's current level. The cost rises with item's level. Components Upgrade components can be incorporated