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Item Upgrading in World of Warcraft It is possible to boost the efficiency of your equipment by upgrading it. Some upgrades can also improve the look of your gear. Upgrades allow reroll affixes to be added, and add extra stats. If the item was originally equipped with Enhanced Defense, then its Enhanced Defense stat is upgraded to a maximum of +1. In other cases its Enhanced Defense will roll a new value. Leveling The process of leveling is to determine the heights of points with respect to a metric.