https://yamcode.com/why-adding....-a-item-upgrader-to-
in World of Warcraft The War Within introduced two gear upgrade currencies: Valorstones and Harbinger Crests. These can be exchanged at the NPCs who upgrade items, Cuzolth and Vaskarn. Each item can be upgraded up to its maximum level only once for the slot. Afterward upgrades to that slot will be cheaper. The pity system, which was introduced with The War Within, also reduces the extreme variance of upgrades. Upgrades Upgrades are parts that enhance performance or add new functionality. They can be
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