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Pokemon World of Warcraft - What is Item Upgrade? Item upgrade is a system that lets players increase the power of weapons, armor and trinkets. It also provides unique effects and procs. Most stats are increased linearly. For instance the Muscle Band at level 20 would give you +1 attack as well as +.5% attack speed. The system also has the potential to fail, which consumes all upgrading materials. Glyphs Glyphs are a great way to upgrade the gathering tools and provide bonuses or improvemen