Genshin Impact - The Basics of Item Upgrading in Genshin Impact Item upgrading is the primary method to boost the stats of weapons and armor and character/ship stats. When an item is upgraded its iLevel and rarity increase, as well as any additional modifiers it might have. Certain items can only be upgraded using an exclusive resource. These resources can be found in the surrounding area or by looting minor loot chests. Rerolling There are a number of ways to reroll Genshin Impact, though many players are of the opinion