The Importance of Upgrades in World of Warcraft
Upgrades are a different kind of item upgrade that can provide an increase in your stats. You can upgrade your armor, weapons and trinkets with these.
Item upgrades use a system called "upgrade pity" to determine probabilities. This method is intended to reduce extremes of luck and provide an adequate safety net when upgrading.
Armor
The item upgrader gives players the possibility to upgrade the level of equipment of their armor, weapons and trinkets. The upgrades are applied to the equipment through a visit to an item upgrader (this guy) NPC with the appropriate currency. The upgrade of an item upgrade will improve the stats of that item.
This NPC can be found in each major city, and is located in the corner of the square near the Teleport. The NPC can be utilized to upgrade any item upgrader mod of armor or weapon with the exception of items that require a quest to acquire or craft.
Note: The thing you use to upgrade your gear will be destroyed forever.