World of Warcraft Upgrades and item upgrading (m1bar.com)
Upgrades increase the value of certain numeric statistics on armor, weapons and rings. They also increase bonuses such as damage from PvE and crit chance.
For instance, a weapon with the upgrade template ending in % will gain 3% attack damage every time it is upgraded (relative to its previous value).
Item upgrading costs crests and the current level of the item level upgrade. The cost increases as the level of the item rises.
Components
upgrade items components can be added to weapons, armor and trinkets in order to provide them with a boost in stats or to add an additional effect. These can be obtained by crafting, purchasing from vendors or trading with other players, or looting. Certain upgrades also come with special cosmetic effects.
upgrade item components can only be applied to equipment with a slot. The item upgrader mod must be at least upgraded to a blue level before a component can be used.
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