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The Item Upgrader in World of Warcraft The War Within introduced two gear upgrade currencies: Valorstones and Harbinger Crests. They can be traded with the NPCs for upgraders of items Cuzolth and Vaskarn. Each item can be upgraded to the highest level for a specific slot at a time. After that upgrades to the slot will be less expensive. The pity system, introduced in The War Within, also lowers the extreme upgrade variance. Upgrades Upgrades are components that improve performance or add new functionality. They can be purchased or earned in various