https://yamcode.com/10-books-t....o-read-on-item-upgra
World of Warcraft - Item Upgrading Item upgrading allows players to raise the level of their weapons, armor, and trinkets. The majority of upgrades boost numeric stats whereas others can have special effects. Item upgrades are an essential aspect of a player's growth in Path of Exile. They increase the damage of gear/ships and combat effectiveness. Typically items that don't vary in terms of requirements following upgrading (like Eth Titans) will receive a slightly lower value in trade than the non-upgraded versions. Recycled items