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World of Warcraft Upgrades and Item Upgrading Upgrades increase the value of certain numeric stats on armor, weapons and rings. Upgrades also boost bonuses like crit chance and PvE Damage. For instance a weapon that has the upgrade template ending in % will gain 3% attack damage every time it upgrades (relative to its previous value). The cost for upgrading items increases when they reach the item's current level. The cost increases as the item's level increases. Components Upgrade components can be added to weapons, armor and trinkets to give them a stat boost o