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Item Upgrading and Rerolling in World of Warcraft Upgrades can be made to items to improve their performance. Upgrades to gear are important, especially early on. Upgrade your BiS (Best in Slot) items first, then proceed to other pieces of gear that fit your build. Upgrade tokens can be used on the item's upgrade window to upgrade it. The number of upgrade slots varies by item type. Upgrade components Upgrade components are unique items that can be slotted into armor, weapons trinkets, gathering tool