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World of Warcraft Upgrades and Item Upgrading Upgrades can increase the value of weapons, armors and rings. Upgrades also boost bonuses like Crit chance and damage from PvE. If the weapon's upgrade template ends in %, it will increase 3percent of its previous damage every time it's upgraded. The cost of upgrading an item is determined by the item's level. The cost increases as the level of the item increases. Components Upgrade components are items that can be inserted into weapons, armor, and trinkets to give a stat bonus or extra impact while they're being used