Diablo 4 Season 8 is in full swing, and it brings some of the toughest endgame challenges the game has seen so far. With the arrival of Uber Belial and Lair Bosses, players are quickly adapting to new mechanics, tougher scaling, and evolving build requirements. Season 8 also introduces changes to boss scaling and introduces Apparition Incursions and Lair events, both of which reward players with powerful boss powers. These new systems directly impact how players approach building characters for the endgame.

Torment 4 difficulty has been increased significantly in Season 8. Compared to Season 7, it is now about 2.5 to 3 times harder, though still more forgiving than the extreme Public Test Realm (PTR) versions. Players who want to defeat Belial and the Lair Bosses will need builds that can deal strong single-target damage, scale with boss modifiers, and offer enough survivability to handle extended fights.

Let's break down the best builds for each class based on their effectiveness against Uber Belial and the other high-end bosses of the season.

1. Blood Wave Necromancer (S Tier)

The Blood Wave Necromancer continues to be a dominant choice in Season 8. Even after the nerfs in the previous season, buffs in the most recent patch have kept this build firmly in the meta. What makes Blood Wave so powerful is its massive burst potential and its ability to consistently overpower enemies without relying too much on external boss powers. This gives it excellent scaling for endgame boss content.

Players can use Blood Wave to clear Torment 4 and challenge Pit tiers effectively. It doesn't require rare gear to perform well and remains one of the most accessible and powerful builds for Necromancers this season. Its strong AoE and single-target damage ensure it's a reliable pick for all major encounters, including Uber Belial.

2. Bone Blood Spear Necromancer (S Tier)

The Bone Spear build has received important fixes and buffs that make it one of the strongest builds in the game right now. In previous seasons, Bone Spear was held back by mechanical issues that disrupted its overpowering potential. With these issues resolved, Bone Blood Spear now delivers devastating damage consistently.

This build excels at ranged combat, which is particularly helpful against Belial and similar bosses. With the right Paragon setup and gear investment, players can tear through Torment 4 and climb high into Pit ladders. Bone Blood Spear is now a true boss killer and stands tall next to Blood Wave as one of the top Necromancer builds of the season.

3. Mighty Throw Barbarian (S Tier)

Mighty Throw Barbarian has turned into a major surprise this season. Due to a change in how damage is calculated—specifically switching from additive to multiplicative scaling—this build now outputs truly massive numbers. Some players are reporting damage in the trillions, with the ability to one-shot bosses like Belial.

While Mighty Throw lacks the farming efficiency of other builds, it's unbeatable when it comes to pure boss damage. For players who want to focus on Belial and Lair Bosses, this is one of the best choices. Many players will run Mighty Throw just for boss encounters and then switch to another build for faster content clearing.

4. Quill Volley Poison Spiritborn (S Tier)

Spiritborn is a new class added in Season 8, and the Quill Volley Poison build has quickly become one of its best. This build leverages poison stacking with the Ashava boss power, which was significantly boosted between PTR and live launch. Combined with the Noxious Resonance key passive, it can deliver instant bursts of poison damage that scale incredibly well.

In testing, the Quill Volley build has landed hits in the hundreds of trillions. While future nerfs may reduce this somewhat, it's likely to remain a top option for players wanting to take on Uber Belial and Lair Bosses. It also provides solid mobility and burst potential, making it a great all-around pick for boss-focused gameplay.

5. Lightning Spear Sorcerer (S Tier)

Lightning Spear Sorcerer continues to be a popular and high-performing build. With the help of the Beastmaster boss power, which boosts summoned units, Lightning Spear scales exceptionally well. It can deal high burst damage, both in AoE and single-target situations.

The build also benefits from an overpower snapshot mechanic, where Lightning Spears can retain the overpower status indefinitely after triggering it once. This allows for huge, consistent damage during boss fights. While it can take some effort to set up correctly, this build is fast, mobile, and deadly once fully optimized.

6. Death Trap Rogue (S Tier)

Death Trap Rogue remains a staple in the S-tier category, even after recent tuning changes. This build excels in boss fights thanks to its ability to group enemies and unleash massive bursts of damage in a short timeframe. The build also maintains excellent mobility, allowing players to reposition easily during longer boss battles.

While it doesn't hit quite as hard as some of the other top builds, its versatility and consistency make it a great option for players looking to do both boss fights and general endgame content. Skilled players can use cooldown optimization to keep Death Trap active almost constantly.

7. Blizzard Sorcerer (A Tier)

Blizzard Sorcerer has benefited from buffs to Ice Spikes and improvements to core scaling. While it excels in AoE scenarios, it is also viable against single-target bosses like Belial. This build is consistent and safe, with reliable damage over time and solid crowd control capabilities.

It may not deliver explosive burst damage like Lightning Spear or Death Trap, but it makes up for it with steady performance and fewer mechanical requirements. Blizzard Sorcerer is a great option for players who prefer methodical, paced fights with lower risk and solid survivability.

8. Double Swing Barbarian (A Tier)

Double Swing has become a more viable option thanks to fury cost reductions and improved damage output. This build offers a more balanced approach, suitable for both farming and boss fights. While it doesn't pack the punch of Mighty Throw, it's easier to manage and more forgiving for longer encounters.

Double Swing also benefits from smoother resource generation, making it less prone to running dry during extended battles. It's a strong choice for players who want one build that can do a bit of everything.

9. Firestorm Evade Spiritborn (A Tier)

This Spiritborn build is fast, flashy, and effective. By combining the newly fixed Firestorm mechanic with the Sunbird Gorget amulet, this build creates a mobile, high-damage playstyle that's great for both farming and boss fights. Firestorm provides solid auto-aimed damage, allowing players to stay mobile while still dishing out punishment.

While it's not quite as potent as Quill Volley when it comes to raw boss-killing power, it offers better mobility and speed. Players who enjoy fast-paced action with less setup will find Firestorm Evade to be a rewarding and effective build for Season 8.

10. Blood Lance Necromancer (A Tier)

Blood Lance has received updates that improve its reliability and damage potential. It now offers better overpower consistency, which makes it more competitive for boss content. It doesn't quite match the performance of Blood Wave or Bone Blood Spear, but it's still a solid build that provides good balance between AoE and single-target damage.

For Necromancer players looking for an alternative to the top two builds, Blood Lance provides a fun and effective option for Belial and Lair Bosses.

Conclusion

Diablo 4 Season 8 pushes players into more challenging content than ever before, with Uber Belial and Lair Bosses acting as gatekeepers to the highest rewards. The best builds in this season are focused on high single-target damage, solid survivability, and efficient use of boss powers.

Necromancer continues to dominate, Spiritborn brings fresh and deadly mechanics to the table, and even older builds like Lightning Spear and Death Trap remain competitive. Whether you're chasing the Season Journey, climbing the Pit ladder, or just looking to crush Belial, picking the right build will be crucial to your success.

What class are you planning to use to take down Uber Belial in Season 8?

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