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World of Warcraft Upgrades and Item Upgrading Upgrades boost the value of certain numeric stats on armor, weapons and rings. They also increase bonuses such as crit chance and PvE damage. If the weapon's upgrade template ends in %, it will increase 3% of its previous attack damage every time it's upgraded. The cost of upgrading an item is determined by the item's level. The cost increases with item's level. Components Upgrade components can be added to weapons, armor and trinkets in order to provide them with a boost