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Diablo 4 Item Upgrades Item upgrades allow players to increase the item level of equippable items like weapons, armor, and trinkets up to a certain amount. You can upgrade items at any NPC that accepts the appropriate currency. Slots are used to add components to upgrade equipment to increase attribute bonuses and additional effects. The majority of these upgrades are slot-restricted but some are universal. Rerolling In Diablo 4, a player can roll a new upgrade to an item. This is