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Item Upgrading and Rerolling in World of Warcraft Upgrades can be added to items to increase their performance. Upgrades to gear are essential especially in the beginning of. Start by upgrading BiS (Best-in-Slot) items before working on other items that are compatible with your build. Item upgrading is done by using Upgrade Tokens to fund the upgrade window of an item. The slots available for upgrading vary by item type. Upgrade components Upgrade components are special items which can be added to weapons, armors trinkets, weapons, and gathering tools. Each upgra