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https://telegra.ph/A-How-To-Gu....ide-For-Item-Upgrade
The Item Upgrader in World of Warcraft The War Within introduced Valorstones, and Harbinger Crests as two currencies for upgrading equipment. These currencies can be traded at the NPCs of rs Cuzolth and Vaskarn. Each item can be upgraded to its highest level for a given slot once. Then, upgrades to that slot will be less costly. Additionally the pity system that was introduced with The War Within lowers extreme variation