The primary way to do this is with multiple rare materials, one of which is Forgotten Souls. Difficult to acquire but necessary for fully upgrading your gear D2R Items, they form a key component of a completed end-game build. This guide will explain exactly what Forgotten Souls are used for, where you can find them, and the best farming strategies for quickly increasing your haul.

Forgotten Souls are one of the most important end-game currencies in Diablo 4. They are used for upgrading Sacred and Ancestral items to their maximum upgrade levels. This is extremely important for your progression as upgrading an item gives a flat increase to all its stats, which is especially powerful on Weapons thanks to their Weapon DPS stat.

Alongside item upgrades, Forgotten Souls can also be used to Enchant an item. Performed at an Occultist NPC, this means rerolling one of the stats on the item into a randomised new one. When you are trying to find a perfectly statted item, being able to swap out a useless stat for your best-in-slot is very strong and can turn a decent item into an amazing one.

While this system predominantly costs large amounts of Gold, it will also take one Forgotten Soul every time you wish to reroll, a cost that can easily rack up due to the random nature of Enchanting.

Although Forgotten Souls are critical for end-game progression, they can only be gathered from one source; Helltide zones. Helltides are not always active cheap D2R ladder items, making the acquisition of Forgotten Souls a bit tricky. Add to that the low drop chance and you're looking at one of the premium currencies in Diablo 4.