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Diablo 4 Item Upgrades The upgrade of an item allows players to increase the level of equippable items like trinkets, armor, weapons and weapons over a certain threshold. You can upgrade items at any NPC that accepts the appropriate currency. Slots are used to upgrade components into equipment to increase attributes and bonuses, as well as other effects. Most of these upgrades are slot-restricted however some are universal. Rerolling A player can roll an upgrade to an item in Diablo 4. This is done by using t