Diablo 4 introduces an intricate system for summoning powerful bosses that offer unique challenges and rewards. These bosses provide an engaging endgame experience, requiring players to collect specific materials to initiate battles. Here’s a detailed guide on the locations, summoning requirements, and strategies for each boss in Diablo 4.

Key Bosses and Their Summoning Requirements
The summoning process in Diablo 4 revolves around collecting rare materials like the Diablo 4 boss summon items. These materials can be acquired from various sources, including Whisper Caches, World Bosses, and local events. Let’s break down the specifics for each boss.
Varon
Varon can be located in the Malignant Burrow near the Tree of Whispers, north of Howar and southeast of Kashan. To summon Varon, you’ll need:
- 1 Gurgling Head
- 1 Blackened Femur
- 1 Trembling Hand
- 1 Malignant Heart
These items drop randomly from Whisper Caches, Elites, Treasure Goblins, and events. Alternatively, they can be refined at The Alchemist. Summoning Varon’s tormented version requires triple the materials and two Stig Stones, which are found in World Tier 4. Defeating Varon grants a chance to acquire Mucus Slick Eggs, essential for summoning Duriel.
Gregaar
Gregaar resides in the Hall of Penitent, south of Ked Bardu. His altar demands:
- 5 Living Steel
Living Steel is primarily found in Helltide chests labeled “Tortured Gift of Living Steel.” It can also drop from Whisper Caches, Treasure Goblins, and Elites. For a tormented version, you’ll need 15 Living Steel and two Stig Stones. Gregaar drops Shard of Agony, a vital component for summoning Duriel.
Duriel
Duriel can be found in the Gaping Crevice, east of Gayol. His summoning requirements include:
- 2 Mucus Slick Eggs
- 2 Shards of Agony
These materials can be obtained from defeating Varon and Gregaar. Similar to other bosses, the tormented version requires triple the materials and two Stig Stones. Duriel’s unique drops make him a valuable target in the endgame.
Advanced Bosses: Zir, Beast in the Ice, and Andariel
As players progress, they encounter even more challenging bosses requiring meticulous preparation and rare materials.
Zir
Zir is located in the Darkened Way, east of Kashad. To summon him, you’ll need 9 Exquisite Blood, which can be acquired from World Bosses, Legion Events, and Helltide activities. For the tormented version, you must collect 27 Exquisite Blood and two Stig Stones. Zir drops Sand Scorch Shackles, necessary for summoning Andariel.
Beast in the Ice
Unlike other bosses, Beast in the Ice requires crafting a Nightmare Dungeon. Players must gather:
- 9 Distilled Fear
- 250 Sigil Powder
Distilled Fear is earned from completing tier 30+ Nightmare Dungeons, while Sigil Powder is crafted at Nius. To summon the tormented version, 27 Distilled Fear and two Stig Stones are needed. Defeating Beast in the Ice rewards players with unique items like the Pin Cushion Doll.
Andariel
The final boss, Andariel, resides in the Hanged Man’s Hall, east of Tarak. Her altar requires:
- 2 Sand Scorch Shackles
- 2 Pin Cushion Dolls
These materials can be obtained from Zir and Beast in the Ice. Tormented Andariel demands triple the materials and two Stig Stones. Her unique drops are highly sought after by players aiming to optimize their builds.
Summoning and defeating these bosses is one of the most rewarding activities in Diablo 4. By carefully gathering the required materials and planning your battles, you can conquer these challenges and reap the unique rewards they offer.