If you're trying to buy game items on u4gm, u4gm diablo 4 gear is where I usually start checking, but honestly the bigger flex is unlocking the hidden Purified Essence boss instead of just spamming the same dungeon loop. This encounter isn't something you randomly bump into. It's gated behind a map-wide scavenger chain, and it forces you to move through multiple regions, plan your route, and make sure your build can survive more than a quick burst window.

How the Purified Essence drops work

The whole thing hinges on four specific Purified Essences, and you can't substitute anything. You need all four, period. 1. Purified Tongue of Azmodan comes from taking down Azmodan during a world boss event in Hawezar, and the fight gets messy fast if your group isn't paying attention. 2. Purified Claw drops from Andariel in the Under City, where cramped space makes bad positioning feel extra punishing. 3. Purified Eye of Belial comes from Belial inside the Pit, and it's more of a stamina check than a flashy burst fight. 4. Purified Horn is tied to the Hell Flood event, where Duriel can replace the usual Blood Maiden encounter, so you'll want to be ready to pivot when that swap happens.

Finding the altars across Sanctuary

Getting the set is only half the job. After you've got all four essences in your inventory, you have to take them to four ancient altars spread across the world. They're located in Hawezar, Nahantu, Fractured Peaks, and Kehjistan. The order doesn't matter, and you don't have to do it in one uninterrupted session, which is nice. But nothing triggers until every altar is activated, so don't expect a partial turn-in to do anything besides waste your travel time.

Surviving the secret boss and cashing in

This is where a lot of builds get exposed. The secret boss isn't impressed by glass-cannon numbers, and you'll feel it the second mechanics start stacking. If your resistances aren't in a good place, if your armor is lagging, or if you're relying on one shaky defensive cooldown, you're probably going to get deleted.

If you do hold up, the reward chest is legit: crafting materials like Majestic Spark for Mythic crafting, Tributes for the Under City, a shot at Legendary Uniques, plus some cosmetics to show you actually did the work. If you're also looking to pick up specific rune upgrades along the way, you can grab deals here: buy diablo 4 runes cheap and keep your loadout moving forward.