https://www.webwiki.com/cases.gg/item-upgrader
Diablo 4 Item Upgrades Upgrades to items let players increase the level of equippable items like weapons or armor, as well as trinkets up to a certain amount. They can be obtained at any upgrader NPC using the appropriate currency. Upgrade components are slotted into equipment to offer bonus effects and attribute bonuses. Most of these upgrades are slot-restricted however some are universal. Rerolling In Diablo 4, a player can roll a new upgrade to an item. This is done through the Level Up mechanic, which stops the game and shows the list