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Genshin Impact - The Basics of Item Upgrading in Genshin Impact Item upgrading is the primary method of boosting weapon/armor stats and the character/ship stats. When an item is upgraded, its rarity and iLevel rise and so do any extra modifiers it may possess. Some items can only be upgraded by using a specific resource. These resources can be found in the surrounding area or through looting minor chests of loot. Rerolling offers a variety of rerolling options, but many players find the time commitment