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World of Warcraft Upgrades and Item Upgrading Upgrades increase the value of certain numeric stats on armor, weapons and rings. They also boost extra bonuses, such as damage from PvE and crit chance. If the template for upgrading a weapon ends in %, it will gain 3% of its previous damage for each time it is upgraded. Item upgrading costs crests and the current level of the item. The cost increases with the item's level. Components Upgrade components are items that can be put into armor, weapons, and trinkets to give an additional stat boost