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Item Upgrading and Rerolling in World of Warcraft Items can be upgraded to increase their effectiveness. Upgrades to gear are essential, especially early on. Begin by upgrading BiS (Best-in-Slot) items and then work on other pieces of equipment that fit your build. Upgrades to items are made by spending Upgrade tokens in the item's upgrade window. The slots for upgrade are different by item type. Upgrade components Upgrade components are unique items that can be added to weapons,