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Item Upgrading and Rerolling in World of Warcraft Items can be upgraded to boost their performance. Upgrades to gear are essential, especially early on. Upgrade your BiS (Best in Slot) items first, then proceed to other pieces of gear that will fit your build. Upgrade Tokens can be used in the upgrade window of an item to upgrade it. The number of upgrade slots varies according to the type of item. Upgrade components Upgrade components are special items that can be added to weapons, armors, trinkets, and gathering