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Item Upgrading and Rerolling in World of Warcraft Items can be upgraded to improve their stats. Upgrades are essential for gear, particularly in the early game. Start by upgrading BiS (Best-in-Slot) items, then work on other pieces of equipment that fit your game plan. Upgrade Tokens can be used in the upgrade window of an item to upgrade it. The slots for upgrade are different by item type. Upgrade components Upgrade components are specialized items that can be added to armors, weapons