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Pokemon World of Warcraft - What is Item Upgrade? Item upgrade is a system that allows players to increase the stats of weapons, armor and trinkets. It also provides unique effects and special effects. Most upgrades increase stats linearly, for instance a level 20 Muscle Band would give +1 attack and +.5 percent attack speed. The system also has a chance to fail, which will consume all upgrading materials. Glyphs Glyphs are a great way to upgrade tools for gathering and provide bonuses or improvements. They can be bought in the market or found in dungeons