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Diablo 4 Item Upgrades The upgrade to an item allows players to raise the item level for equippable items like weapons, armor and trinkets over a certain threshold. You can upgrade items at any NPC that accepts the appropriate currency. Slots are used to components to upgrade equipment to gain attribute bonuses and additional effects. They are generally slot-restricted, but there are some universal upgrades. Rerolling In Diablo 4, a player can roll back an upgrade for an item. This is done via the Level Up mechani