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Genshin Impact - The Basics of Item Upgrading in Genshin Impact Item upgrading is the primary method of increasing the stats of weapon/armor and the stats of a character or ship. When an item is upgraded, its rarity, iLevel and any other modifiers are increased. Certain items can only be upgraded using a specific resource. These resources can be found in the environment or through looting small chests of loot. Rerolling There are several methods to reroll in Genshin Impact, though many pla