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The Importance of Upgrades in World of Warcraft Upgrades are a different kind of item that provides a boost to your stats. You can upgrade armor, weapons and trinkets with these. Upgrades to items use a system called "upgrade pity" to calculate probabilities. This system is meant to reduce extremes of luck and provide an adequate safety net when upgrading. Armor The item upgrader lets players upgrade the equipment level of their trinkets, armor, and weapons. The upgrades are applied to the equipment by visiting an upgrader NPC with