Diablo 4 Season 9: Complete Lair Boss Tier List and Farming Guide

Lair Bosses in Diablo 4 are the pinnacle of Diablo 4 Items targeted boss farming, especially in Season 9, where Horadric Spellcraft and Mythic gear push character builds into new territory. With the addition of new Uniques, the expansion of the Lair Boss ladder, and balance tweaks introduced in Season of the Malevolent Hatred, endgame players have more reason than ever to carefully plan which bosses they're grinding.

This in-depth tier list doesn't just sort Lair Bosses by loot value - it evaluates each fight's accessibility, combat difficulty, farming efficiency, and exclusive rewards, helping you get the most out of your time in Diablo 4's high-stakes endgame.

Tier Ranking Criteria

Each Lair Boss has been ranked based on the following:

Loot Value: Are the Uniques worth chasing?
Boss Accessibility: Is the boss easy to summon or gated behind rare components?
Combat Challenge: How difficult is the fight mechanically?
Expansion Requirements: Do you need Vessel of Hatred to access it?
Material Efficiency: Can the boss help you farm for other boss summoning items?

S-Tier: Pinnacle Lair Boss of Season 9

Belial - Lord of Lies

Type: Pinnacle Boss
Entry Materials: Betrayer's Husks (from all other bosses)
Expansion Required: Yes (Vessel of Hatred)

Why Belial is #1:

Belial remains the ultimate farming target in Diablo 4 Season 9 for good reason. After players complete the lengthy climb through the other bosses to obtain Betrayer's Husks, they can challenge Belial for a chance at any Unique or Mythic item in the game - not just boss-specific ones.

Unique Strategy:

Belial is one of the most complex fights in the game. The phase transitions, deceit mechanics, and illusion clones force players to stay on their toes. It's critical to bring purge effects, mobility skills, and damage-over-time mitigation. Build for mixed elemental resistances, as Belial shifts between poison, fire, and shadow.

Loot Highlights:

Mythic-quality Diablo 4 Items

Any Unique in the game, including:

Harlequin Crest
Tyrael's Might
Heir of Perdition
Azurewrath

Verdict:

Even with a steep material requirement, Belial is the most rewarding boss to farm. Prepare builds to survive the encounter, and enjoy access to the full game's loot pool.

A-Tier: High-Value and Worthwhile Targets

Varshan - Initiate Boss

Entry Materials: Malignant Hearts
Expansion Required: No

Why Varshan Ranks High:

Varshan is one of the most accessible Lair Bosses - requiring only Malignant Hearts, which are common in Season 9's world events. As a low-tier Lair Boss, he's perfect for early endgame players but still drops top-tier loot.

Strategy Tip:

Avoid shadow-pool stacking and focus on burst DPS phases after his AoE heart explosion. Stack Shadow Resistance and use movement abilities like Dash, Teleport, or Blood Mist to avoid lingering ground damage.

Loot Highlights:

Rotting Lightbringer (Druid)
Balazan's Maxtlatl (Spiritborn)
Loyalty's Mantle (Spiritborn)
Shards of Agony (for Duriel)

Verdict:

Excellent early target for gearing and crafting boss materials. Easy to defeat and drops some of the best new Spiritborn gear.

Urivar - Greater Boss

Entry Materials: Hatred-touched Hearts
Expansion Required: Yes

Why Urivar Is Valuable:

Urivar drops several of Season 9's best new Uniques across multiple classes. With careful positioning and resistances, he's beatable without needing perfect gear. His fight can be chaotic but manageable with fire-resist gear.

Strategy Tip:

Urivar's knights of fire shoot flame trails in a cross-pattern. Stay mobile, avoid kiting in tight circles, and use crowd control to interrupt cast phases. Fire Resistance is non-negotiable here.

Loot Highlights:

Hooves of the Mountain God (Barbarian)
Deathmask of Nirmitruq (Rogue)
Balazan's Maxtlatl
Rotting Lightbringer
Abhorrent Hearts (for Harbinger of Hatred)

Verdict:

One of the most diverse loot tables of the season. A must-farm for class optimization if you own Vessel of Hatred.

Andariel - Greater Boss

Entry Materials: Pincushioned Dolls / Stygian Stones
Expansion Required: No

Why She's A-Tier:

Andariel's loot table includes endgame-defining Uniques like Shroud of False Death, Heir of Perdition, and Harlequin Crest. Though her three-phase fight is difficult, the rewards make the grind worth it.

Strategy Tip:

Andariel attacks with poison clouds, summoned spirits, and firewalls. Max poison, fire, and shadow resistances. Utilize DoT builds, as she moves frequently, interrupting burst windows.

Loot Highlights:

Shroud of False Death
Heir of Perdition
Harlequin Crest
Stygian Stones (used for more Lair boss summons)

Verdict:

Harder than Varshan, but vastly superior in loot. It is valuable to buy D4 materials if you're targeting legacy Mythics and rare defensive Uniques.

B-Tier: Niche or Difficult, But Still Viable

Duriel - Greater Boss

Entry Materials: Shards of Agony
Expansion Required: No

Why Duriel Falls to B-Tier:

Duriel's fight is mechanically brutal. He stuns, poisons, and floods the arena with bile pools. While his loot table is similar to Andariel's, the difficulty-to-reward ratio is far worse.

Strategy Tip:

Bring poison cleanses, unstoppable skills, and damage mitigation. Use ranged builds if possible to stay out of the splash zones. Keep moving, or you'll get pinned and poisoned.

Loot Highlights:

Harlequin Crest
Tyrael's Might
Same Uniques as Andariel
Azurewrath (low drop chance)

Verdict:

Viable, but more frustrating than Andariel. Only target if you're farming Shards of Agony elsewhere.

Harbinger of Hatred - Greater Boss

Entry Materials: Abhorrent Hearts
Expansion Required: Yes

Why It's B-Tier:

Essentially a variant of Duriel or Andariel. Shares the loot pool but lacks unique identity. Limited appeal outside of already farming Urivar.

Strategy Tip:

Like Andariel, the Harbinger spams AoE shadow spells and adds. Bring adds-clearing skills, high AoE damage, and teleport/mobility to reset boss line of sight.

Loot Highlights:

Same pool as Andariel/Duriel
Heir of Perdition
Shroud of False Death

Verdict:

Only worth farming if you're in a loop farming Urivar → Harbinger for crafting mats and Uniques. Low priority otherwise.

The Beast in the Ice - Initiate Boss

Entry Materials: Glacial Shards
Expansion Required: No

Why It's B-Tier:

The Beast drops some new Season 9 gear, but the fight is long and freeze-heavy, which breaks build uptime. Still, he's a solid source for Pincushioned Dolls to unlock Andariel.

Strategy Tip:

Bring freeze immunity, use Unstoppable effects like Rallying Cry, Blood Mist, or Smoke Grenade. Avoid standing still - most attacks are delay-triggered AoEs.

Loot Highlights:

Hooves of the Mountain God
Deathmask of Nirmitruq
Pincushioned Dolls

Verdict:

A reliable farming boss for crafting materials, even if loot is average. Good for setup runs.

C-Tier: Situational or Outclassed

Lord Zir - Initiate Boss

Entry Materials: Stygian Stones
Expansion Required: No

Why Zir Falls Flat:

No access to new Season 9 Uniques. His fight is straightforward but time-consuming. He only shines as a Pincushioned Doll farm (for Andariel), and even then, Beast in the Ice is more efficient.

Loot Highlights:

Penitent Greaves
Iceheart Brais
No new Uniques

Verdict:

Skip unless needed for Stygian Stones or low-importance gear.

Grigoire - Initiate Boss

Entry Materials: Living Steel
Expansion Required: No

Why Grigoire Is Weak:

Although he's the easiest Lair Boss, his loot pool is severely outdated. He drops Shards of Agony (Duriel materials), but Varshan is the better option.

Strategy Tip:

Grigoire's lightning adds explode on death. Focus on quick AoE, and use shock resistance if available. Don't let his simplicity lull you into lazy play.

Loot Highlights:

Loyalty's Mantle (rare)
Storm's Companion (low drop rate)
Shards of Agony

Verdict:

Only worth farming for early Duriel mats, and even then, Varshan is a better choice.

Final Thoughts

Diablo 4 Season 9's endgame revolves heavily around efficient boss rotation, material funneling, and targeted Unique farming. Based on loot accessibility and mechanical challenge, the best strategy is:

Recommended Boss Farming Route:

1. Farm Varshan and Beast in the Ice for entry-level Uniques and mats.
2. Move to Urivar and Andariel to get access to better Uniques.
3. Use mats from these bosses to summon Belial - the endgame jackpot.

Remember: not all bosses are worth your time every season. Focus your runs on loot-rich, less frustrating fights, and you'll spend less time grinding and more time gearing up buy duriel mats your ultimate build.