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Pokemon World of Warcraft - What is Item Upgrade? The system allows players to increase the performance of trinkets, armors and weapons. It also offers some unique effects and special effects. The majority of upgrades increase stats linearly, for instance a level 20 Muscle Band will give an additional attack, and +.5% attack speed. The system has a risk of failing, and will take all the upgrades materials. Glyphs Glyphs are a kind of upgrade component that can be placed in gathering tools to provide bonus