https://telegra.ph/What-Is-The....-Reason-Item-Upgrade
https://www.openlearning.com/u..../richterdempsey-sles
Diablo 4 Item Upgrades Item upgrades allow players to increase the level of equippable items such as weapons or armor, as well trinkets up to a certain amount. You can upgrade items at any NPC that accepts the appropriate currency. Upgrade components are integrated into equipment to provide attributes bonuses and other effects. They are generally slot-restricted, however, there are certain universal upgrad