https://posteezy.com/what-item....-upgrader-history-it
Item Upgrading and Rerolling in World of Warcraft Items can be upgraded to increase their stats. Upgrades are crucial for gear, particularly in the beginning of the game. Upgrade your BiS (Best in Slot) items first, then proceed to other items that are compatible with your game. Item upgrading is done by spending Upgrade Tokens on the item's upgrade window. The amount of slots for upgrading varies according to the type of item. Upgrade components Upgrade components are unique items which can be added to armors,