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World of Warcraft Upgrades and Item Upgrading Upgrades increase the value of certain numeric stats on weapons, armor and rings. They also increase bonuses, such as damage from PvE and crit chance. For that has the upgrade template ending in % will gain 3% attack damage every time it is upgraded (relative to its previous value). The cost of upgrading an item is determined by the item's level. The cost increases as the item's level rises. Components Upgrade components can be added to trinkets, weapons and ar