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Item Upgrading and Rerolling in World of Warcraft Items can be upgraded to improve their performance. Upgrades to gear are essential especially in the beginning of. Upgrade your BiS (Best in Slot) items first, and then proceed to other pieces of gear that fit your build. Item upgrading is done by spending Upgrade Tokens on an item's upgrade window. The available upgrade slots vary depending on the item type. Upgrade components Upgrade components are special items that can be put into armor, weapons, trinkets