http://b3.zcubes.com/v.aspx?mid=13296483
Path of Exile Item Upgrading Upgrades to items allow players to upgrade their weapons and gear by adding new affixes that boost its stats base or adding additional perks. To upgrade items, players must have the item in their inventory and have access to the kiln. Typically objects with weak bases (like rings) can be upgraded to a stronger base, whereas items with strong bases like Eth titans don't change in their stats following being upgraded. Upgrade components Upgrade components can be used to upgrade trinkets, armor, weapons and gathering to