The Uber Boss Kill Event has officially arrived in Path of Exile:Keepers of the League, and it's one of the most demanding challenges GGG has offered this season. Locked to HCSSF, players must navigate the event with no trading, no grouping, and only one life. Choosing the right build is the difference between victory and a deleted character.

Below are five of the strongest and safest HCSSF builds for tackling Uber bosses in the Keepers League.

1. Earthshatter Berserker

Earthshatter Berserker remains a powerhouse thanks to its explosive Warcry synergy, high clear potential, and Rage-based burst. Neither Earthshatter nor the Berserker ascendancy suffered meaningful nerfs in the Keepers patch, making this one of the most reliable boss-killing melee setups.

Why This Build Shines

Massive burst damage fueled by Rage and Warcry loops

Smooth mobility via Leap Slam

Extremely effective on self-crafted rare gear

Core Gem Setup

Earthshatter, Fortify, Overexertion,Pulverise,Melee Physical Damage, Brutality

Leap Slam,Rage,Faster Attacks,Momentum

Play aggressively:generate Rage by leaping into enemies, then shatter the ground for huge AoE while automated Warcries keep your buffs up 24/7.

2. Reap / Exsanguinate Elementalist

For players who prefer spellcasters, this hybrid physical DoT caster offers exceptional bossing potential. Reap and Exsanguinate scale tremendously with gem levels, DoT multipliers, and golem bonuses-making Elementalist one of the best choices for sustained ranged damage.Don't let currency shortages hold you back-get your POE currency on MMOexp now and thrive!

Why It's Strong

Long-range DoT ideal for Uber boss mechanics

High sustain thanks to golems and regen

Benefits heavily from Keepers League physical DoT changes

Core Gem Setup

Reap,Cruelty,Efficacy,Brutality,Swift Affliction,Corrupting Fever

Exsanguinate,Unbound Ailments,Controlled Destruction,Chain

Golems,Flame, Chaos, Stone, Lightning

Auras,Malevolence, Pride, Vulnerability

Fully viable in SSF, but in trade leagues you can quickly upgrade with +level physical spell weapons and accessories if you purchase extra POE Currency.

3. Righteous Fire Chieftain

If durability is your top priority in Hardcore, Righteous Fire Chieftain is one of the safest choices in the game. With unmatched regeneration and fire mitigation, this build can tank extended boss mechanics while its burning aura melts enemies.

Why It's Safe

Extremely high max fire resistance (80%+)

Strong passive life regeneration and armor

Perfect for long, attrition-heavy Uber fights

Core Gem Setup

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

Turn on RF and let enemies burn as you move. During boss fights, stack Fire Trap to apply heavy DoT on top of your aura damage.

4. Kinetic Blast Hierophant

Though less common in HCSSF, Kinetic Blast Hierophant delivers outstanding screen-wide coverage and impressive single-target potential. As a ranged caster-style projectile build, it keeps you far from danger while unleashing devastating AoE explosions.

Why It Works

Safe, distance-focused gameplay

Synergizes well with spell and projectile scaling

Fantastic crowd control and map clear

Core Gem Setup

Kinetic Blast of Clustering,Returning Projectiles,Physical to Lightning,Lightning Penetration

Shield Charge,Faster Attacks,Rage,Momentum

Wall of Force,Faster Casting,Second Wind

Use Tornado (via Spellslinger if desired) for added burst. Kinetic Blast's overlapping explosions make it superb at deleting packs and chipping down bosses.

5. Ground Slam Slayer

Ground Slam Slayer takes the classic melee experience and enhances it with incredible life leech, high AoE, and the Slayer signature Culling Strike. Its mix of offense and sustain makes it dependable even in high-pressure Uber encounters.

Wide AoE that excels in both clear and boss phases

Guaranteed Culling Strike at 20% HP

Excellent sustain through strong life leech options

Core Gem Setup

Ground Slam,Fist of War,Fortify,Cruelty,Melee Physical Damage,Brutality

Leap Slam,Faster Attacks,Maim,Momentum

Leap in to apply Maim, then slam shockwaves through the arena. Culling Strike ensures bosses drop quickly once they're low.

The HCSSF Uber Boss Kill Event in Path of Exile:Keepers of the League is a brutal gauntlet that tests every aspect of your gameplay-build crafting, patience, mechanical skill, and composure under pressure.Don't wait for victory-buy your POE currency for sale and start ruling the kingdom!

Whether you choose the explosive power of Earthshatter, the soothing tankiness of Righteous Fire, or the precision of a ranged Kinetic Blast Hierophant, these five builds offer some of the best paths to triumph in a mode where death truly matters.