The item upgrader mod Upgrader in World of Warcraft
The War Within introduced two gear Upgrade Item currencies: Valorstones and Harbinger Crests. These currencies can be exchanged at the NPCs who upgrade items, Cuzolth and Vaskarn.
Each item upgrader mod can be upgraded up to the maximum level once for a slot. Then upgrades to that slot will be less costly. Additionally, the pity system introduced with The War Within lowers extreme upgrade item luck variance.
Upgrades
Upgrades are components that improve performance or add new functions. They can be purchased or earned through many ways, including through in-game events and from cash shop items.
As opposed to enchantments that can be added to any item upgrader kit, upgrades are tied to specific items and are only applied to those items. Therefore, upgrades cannot be applied to a weapon unless it already has been equipped by the player. However, certain items can be upgraded multiple times, providing a much more benefit to the owner of the item.