Diablo IV Season 11 introduces many new systems, but few have caused as much confusion as Purified Materials. Players begin finding these rare items during endgame activities, only to realize they can't be crafted, consumed, or traded like normal materials. There's no tooltip explaining their purpose, no quest marker pointing the way, and no NPC offering guidance. That's because Purified Materials are tied to one of Season 11's biggest secrets. If you know how to use them, they unlock a Diablo IV Items hidden event with powerful rewards. This guide explains exactly what Purified Materials are, how to use them, and why they matter.

What Are Purified Materials?

Purified Materials—more commonly referred to as Purified Essences—are rare drops connected to Diablo IV's Lesser Evils. Unlike Corrupted Essences, which are used in visible seasonal mechanics, Purified Materials exist purely for a hidden purpose.

Each Purified Material represents the essence of a defeated demon that has been cleansed rather than corrupted. This theme plays directly into the secret content they unlock. These materials cannot be:

Salvaged

Used in crafting menus

Consumed for buffs

Sold or traded

If an item seems useless but extremely rare, it's almost always tied to an Easter egg—and that's exactly the case here.

Types of Purified Materials in Season 11

There are four Purified Materials, each tied to a specific Lesser Evil:

Purified Essence of Andariel

Purified Essence of Duriel

Purified Essence of Belial

Purified Essence of Azmodan

You must obtain all four to fully complete the hidden sequence. Missing even one will prevent you from accessing the final reward.

How to Get Purified Materials

Purified Materials drop from endgame boss encounters, but the drop rate is extremely low. These are not guaranteed rewards—you may need to defeat the same boss multiple times before seeing a purified version drop.

Here's where each one comes from:

Andariel – High-tier lair or Undercity-style encounters

Duriel – Summoned endgame encounters tied to Helltides

Belial – High-difficulty dungeon or Pit boss fights

Azmodan – World boss rotations or special Hawezar events

Because the drops are rare, the best approach is focused farming. Choose one boss, learn its spawn cycle, and commit to repeated runs. Once a Purified Material drops, it stays in your inventory until used.

What You're NOT Supposed to Do with Them

Many players waste time trying to use Purified Materials the wrong way. To save frustration, here's what not to do:

Don't wait for a quest to appear—it won't

Don't search crafting benches or occultists

Don't expect immediate rewards upon pickup

Don't try to combine them with other materials

Purified Materials only have one purpose, and it exists entirely in the open world.

Using Purified Materials: The Hidden Altars

Purified Materials are meant to be offered at secret altars hidden across Sanctuary. There are four altars total, each tied to one Purified Material and one Lesser Evil.

Important rules:

Each altar accepts only one specific Purified Material

Altars are not marked on the map

You can activate them in any order

Progress is saved, but must be done on the same character

Each material is consumed permanently when used

When you approach the correct altar with the matching Purified Material in your inventory, the altar becomes interactable. Upon activation, you'll see a visual effect confirming success—but no loot yet.

General Altar Locations

While the game doesn't give coordinates, each altar is hidden in a region connected thematically to its demon:

Fractured Peaks – Belial's altar lies in a remote, frozen mountain path

Kehjistan – Duriel's altar is buried near ruined desert structures

Hawezar – Azmodan's altar hides deep in corrupted swamp terrain

Nahantu – Andariel's altar rests near overgrown jungle ruins

These altars are intentionally placed just off main routes to reward exploration. If something looks suspiciously ceremonial or out of place, you're probably close.

What Happens After All Four Are Used

Using all four Purified Materials is when the real payoff begins.

After activating the fourth altar, a mysterious portal spawns at that location. This portal leads to a hidden arena that cannot be accessed any other way.

Entering the portal starts one of Season 11's toughest encounters.

The Secret Boss Event

Inside the portal is a boss rush-style fight featuring the four Lesser Evils you purified earlier. Instead of facing them one at a time like normal encounters, you fight them in paired phases:

Andariel and Belial attack together, combining poison, deception, and burst damage

Duriel and Azmodan follow, overwhelming players with area control and sustained pressure

This event is significantly harder than standard boss fights. Defensive layers, positioning, and damage uptime are critical. While solo clears are possible with optimized builds, groupplay makes the encounter far more manageable.

Rewards for Using Purified Materials

Completing the secret event grants some of the best rewards tied to Season 11:

Guaranteed Ancestral Unique items

Rare endgame crafting materials

High-value loot drops and caches

Exclusive cosmetic rewards

Seasonal progression bonuses

Beyond the loot, completing the event proves mastery of both the season's mechanics and Diablo IV's hidden systems.

Final Tips

Use Purified Materials as soon as you find the matching altar

Don't mix characters—one character must complete all four

Prepare before entering the portal: elixirs, gear upgrades, and skill optimization matter

Expect difficulty—this content is designed for true endgame players

Conclusion

Purified Materials in Diablo IV Season 11 are not crafting items, currencies, or consumables—they are keys. Their sole purpose is to Diablo 4 materials unlock one of the game's best hidden experiences, rewarding curiosity, persistence, and skill. If you're pushing endgame content and want access to exclusive loot and a memorable challenge, knowing what to do with Purified Materials is essential.

Ignore them, and they'll clutter your inventory. Use them correctly, and they'll unlock one of Season 11's greatest secrets.