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World of Warcraft Upgrades and Item Upgrading Upgrades can boost the value of certain numeric stats on weapons, armor and rings. Upgrades can also boost bonuses like Crit chance and PvE Damage. For example, a weapon with the upgrade template ending in % will gain 3% attack damage every time it is upgraded (relative to its previous value). 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 trink