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World of Warcraft Upgrades and Item Upgrading Upgrades boost the value of certain numeric statistics on armor, weapons and rings. They also boost extra bonuses such as PvE damage and crit chance. For example, a weapon with the upgrade template ending in % will take on 3% attack damage every time it upgrades (relative to its previous value). Item upgrading costs crests and the item's current level. The cost increases with the item's level. Components Upgrade components can be added