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Diablo 4 Item Upgrades The upgrade to an item allows players to increase the level of their equippable items such as trinkets, weapons, and armor within 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 attributes and bonuses, as well as other effects. These are mostly slot-restricted, but there are some universal upgrades. Rerolling In Diablo 4, a player can reroll a item upgrade. This is done by using the Level Up feature, which suspends the game an