The Uber Boss Kill Event has officially landed in Path of Exile:Keepers of the League, and it's one of the most punishing challenges Grinding Gear Games has ever released. Locked to HCSSF-Hardcore, Solo Self-Found-players must rely entirely on their own crafting, game knowledge, and survival instincts. With permanent death, no trading, and no party support, choosing the right build is critical.

Below are the five most reliable and powerful builds to take on the Uber Boss gauntlet in the Keepers League.

1.Earthshatter Berserker

The Earthshatter Berserker continues to dominate solo bossing thanks to its explosive Warcry interactions and Rage-fueled burst damage. With no major nerfs to Earthshatter or core Berserker ascendancy nodes, the build remains a staple for HCSSF content.

Why This Build Shines

Enormous burst damage through Warcry loops

Smooth mobility via Leap Slam

Easy to gear-strong even with basic self-crafted rares

Suggested Gem Setup

Earthshatter:Fortify-Overexertion-Pulverise-Melee Physical Damage-Brutality

Leap Slam:Rage-Faster Attacks-Momentum

Utility:Blood and Sand, Blood Rage

Leap into enemies to stack Rage, then detonate with Earthshatter spikes for huge AoE. Automated Warcries ensure near-perfect uptime on all offensive buffs.

2. Reap / Exsanguinate Elementalist

For players who like spellcasters, this hybrid physical DoT Elementalist is a standout option. Both Reap and Exsanguinate scale exceptionally well with investment into gem levels, ailment multipliers, and Elementalist golem buffs.Unleash the power of purchasing POE currency through MMOexp and unlock endless possibilities!

Why This Build Works

Strong long-distance damage-over-time

Smooth sustain through regeneration and golem bonuses

Excellent synergy with new Keepers physical DoT modifiers

Recommended Gem Links

Reap:Cruelty-Efficacy-Brutality-Swift Affliction-Corrupting Fever

Exsanguinate:Unbound Ailments-Controlled Destruction-Chain

Golems:Flame, Chaos, Stone, Lightning

Auras:Malevolence, Pride, Vulnerability

The build functions well on SSF gear, but in trade leagues you can quickly boost output with +level physical spell wands or amulets.

3. Righteous Fire Chieftain

If your top priority in HCSSF is not dying, Righteous Fire Chieftain remains one of the tankiest builds in the entire game. Its regeneration, armor stacking, and fire resistance make it ideal for brutal Uber encounters.

Why This Build Excels

Extremely durable (80%+ max fire res achievable)

Massive life regen and armor layering

Consistent damage over long boss fights

Recommended Gem Links

Righteous Fire:Elemental Focus-Efficacy-Swift Affliction-Burning Damage-Lifetap

Fire Trap:Trap and Mine Damage-Swift Affliction-Burning Damage-Concentrated Effect

Utility:Purity of Fire, Determination, Summon Flame Golem

Activate RF, sweep through packs, and deploy Fire Trap during boss phases for extra burning damage. As long as your regen outpaces RF self-damage, you become incredibly difficult to kill.

4. Kinetic Blast Hierophant

This build offers a safe, high-tempo ranged playstyle using spell-scaled Kinetic Blast. While less conventional than typical meta choices, its screen-wide explosions and strong single-target potential make it surprisingly powerful in HCSSF.

Why Choose This Build

Excellent safety due to long-range playstyle

Scales easily with spell damage and projectile supports

Very strong crowd control with explosive chaining

Gem Link Suggestions

Kinetic Blast of Clustering:Returning Projectiles-Physical to Lightning-Lightning Penetration

Shield Charge:Faster Attacks-Rage-Momentum

Wall of Force:Faster Casting-Second Wind

For even greater damage, combine Kinetic Blast with Tornado via Spellslinger to create devastating hybrid interactions.

5. Ground Slam Slayer

For players who love classic melee combat, Ground Slam Slayer provides a great blend of AoE, sustain, and bossing consistency. The ascendancy built-in Culling Strike and excellent life leech push the build ahead in dangerous encounters.

Why It Performs Well

Huge AoE waves that also excel in single-target

Natural Culling Strike makes finishing bosses safer and faster

Top-tier leech and defensive scaling for Hardcore environments

Recommended Gem Links

Ground Slam:Fist of War-Fortify-Cruelty-Melee Physical Damage-Brutality

Leap Slam:Faster Attacks-Maim-Momentum

Engage with Leap Slam to apply Maim, then unleash Ground Slam for high-impact shockwaves. Slayer sustain allows you to stay aggressive even in extended boss phases.

The Keepers HCSSF Uber Boss Kill Event is designed to push players to their limits. Whether you enjoy the explosive brutality of Earthshatter, the stability of Righteous Fire, or the finesse of a ranged spell strategy, these five builds all offer a viable route to surviving-and winning-in one of the toughest modes Path of Exile has to offer.Enhance your journey in Path of Exile 2 with instant MMOexp buy Path of exile currency!