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Item Upgrading and Rerolling in World of Warcraft Upgrades can be added to items to boost their stats. Upgrades to gear are important particularly early on. Start by upgrading BiS (Best-in-Slot) items and then work on other items that are compatible with your style. The process of upgrading an item is accomplished by spending Upgrade tokens in the item's upgrade window. The slots for upgrade are different according to the type of item. Upgrade components Upgrade components are specialized items which can be added to armors, weapons trinkets, weapons, or gathering