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World of Warcraft Upgrades and Item Upgrading Upgrades increase the value of certain numeric statistics on armor, weapons and rings. They also boost extra bonuses such as PvE damage and crit chance. For instance a weapon that has the upgrade template ending in % will suffer 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 rises with item's level. Components Upgrade components can be incorporated into trinkets, armor, and weapons