https://gradeline68.werite.net..../why-item-upgrade-is
Path of Exile Item Upgrading Players can upgrade their weapons and equipment with new attachments. They can also increase its stats base or add additional benefits. To upgrade an item, the player has to have it in their inventory as well as access to the kiln. Usually, items with weak bases (like rings) can be upgraded to a stronger base, while items with strong bases like Eth titans don't change in their stats following being upgraded. Upgrade components Upgrade components can be added to weapons, armors, trink