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Genshin Impact - The Basics of Item Upgrading in Genshin Impact The primary method to boost the stats of weapons and 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 by using the use of a specific resource. These resources can be gathered from small loot boxes or found in the world. Rerolling There are a number of ways to reroll in Genshin Impact, though many players are of the opinion that the time required to do it makes it unfeasible.