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Item Upgrading and Rerolling in World of Warcraft Items can be upgraded to increase their performance. Upgrades are essential for gear, especially in the beginning of the game. Start by upgrading BiS (Best-in-Slot) items before working on other pieces of equipment that fit your build. Item upgrading is done by spending Upgrade tokens in the upgrade window of an item. The number of upgrade slots is different by item type. Upgrade components Upgrade components are unique