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Diablo 4 Item Upgrades The item upgrade allows players to increase the level of equippable items like trinkets, armor, weapons and weapons above a certain threshold. They can be purchased at any upgrader NPC with the appropriate currency. Slots are used to upgrades to equipment to increase attributes bonuses and other effects. The majority of these upgrades are slot-restricted however some are universal. Rerolling A player can reroll an upgrade to an item in Diablo 4. This is done through the Level Up