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Diablo 4 Item Upgrades The upgrade to an item lets players increase the level of their equippable items such as weapons, armor and trinkets above a certain threshold. You can upgrade items at any NPC that accepts the appropriate currency. Upgrade components are slotted into equipment to give bonus effects and attribute bonuses. These are mostly slot-restricted, however, there are certain universal upgrades. Rerolling A player can reroll an upgrade for an item in Diablo 4. This is done by using the Level Up featur