In Diablo IV, you can acquire extremely rare crafting materials called resplendent sparks that can be used to create uber-unique loot. These were launched with Season 4 and are a great new way to get your hands on the game’s most powerful, endgame items without completely relying on luck. However, finding enough of these incredibly rare materials to do so can be a challenge, as it requires completing some of the hardest content in Diablo IV.