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What Are Item Upgrades in Genshin Impact? Item upgrades are items that can be put into armor, weapons trinkets, gathering tools and trinkets to provide additional stats or extra effects. These upgrades can be bought from vendors or traded with other players, or obtained as a reward. It's generally a good idea to upgrade equipment, particularly in the case of items that are unique or rare. It is however possible to upgrade items too much particularly if they have the highest base requirements. Rerolling There are a few ways to build up your gear in Genshin Impact.