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World of Warcraft Upgrades and Item Upgrading Upgrades boost the value of certain numeric statistics on armor, weapons and rings. Upgrades can also boost bonuses like Crit chance and PvE Damage. For instance, a weapon with the upgrade template that ends in % will gain 3damage to attack each time it is upgraded (relative to its previous value). The cost for upgrading items increases when they reach the item's current level. The cost rises with item's level. Components Upgrade components are items that can be put into armor, weapons and trinkets to give a stat bonu