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Diablo 4 Item Upgrades Item upgrades allow players to increase the level of equippable items like weapons or armor, as well as trinkets to a certain level. They can be purchased at any upgrader NPC with the appropriate currency. Slots are used to upgrades to equipment to gain attributes bonuses and other effects. Most of these upgrades are slot-restricted however some are universal. Rerolling A player can reroll an upgrade for an item in Diablo 4. This is done through the Level Up feature, which s