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Item Upgrading and Rerolling in World of Warcraft Items can be upgraded to boost their stats. Upgrades to gear are important, especially early on. Upgrade your BiS (Best in Slot) items first, then move on to other pieces of gear that fit your build. Upgrade Tokens can be spent on the upgrade window for the item to upgrade it. The number of upgrade slots is different depending on the type of item. Upgrade components Upgrade component