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Diablo 4 Item Upgrades Upgrades to items let players increase the item level of equippable items such as weapons, armor, and trinkets above a certain threshold. They can be done at any item upgrader NPC using the appropriate currency. Slots are used to upgrade components into equipment in order to gain attributes and bonuses, as well as other effects. Most upgrades are slot-restricted, but a few are universal. Rerolling A player is able to reroll an upgrade to an item in Diablo 4. This is done through the Level Up mechanic, which sto