The Importance of Upgrades in World of Warcraft
Upgrades are new items that boost your stats. You can upgrade armor trinkets, weapons, and trinkets using these.
To determine probabilities, item upgrade upgrades are based on "upgrade pity". This system is meant to lower chances of losing and provide an adequate safety net when upgrading.
Armor
The item upgrader provides players with the ability to upgrade item equipment levels of their weapons, armor and trinkets. The upgrades are applied to the equipment through a visit to an Best item upgrade upgrader NPC with the appropriate currency. Upgrading an item will also upgrade the stats on that item upgrader kit.
This NPC is found in every major city and is located at the corner of the square near an teleport. The NPC can upgrade any armor, weapon, or trinket except for those that require a quest, or crafting.
Note: The item upgrading you use to upgrade your gear is destroyed forever. It is not possible to apply multiple upgrades to the same piece.