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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 exchanged at the NPCs who upgrade items, Cuzolth and Vaskarn. Each item can be upgraded to its maximum level only once for the slot. Afterward upgrades to the slot will be less costly. In addition the pity system that was introduced with The War Within lowers extreme variation in the chance to upgrade. Upgrades In gaming, upgrades are replacements for components that enhance performance or add new fea