Path of Exile Slayer Block Build Guide: 100% Delirium "Unkillable" Cyclone
This Slayer Cyclone + Void Shockwave block build sits right on that edge.
It's a high-investment, high-reward setup focused on near-permanent damage mitigation through max block, lucky block mechanics, and layered sustain-while still outputting enough damage to clear heavily juiced content like 100% Delirium maps.
But as the gameplay shows, even "unkillable" builds in Path of Exile still have weak points when the difficulty scaling pushes too far.
Core Build Identity: Slayer Cyclone + Void Shockwave
At the heart of the build is a classic melee archetype: Cyclone paired with Void Shockwave. This combination is popular because it offers:
Constant movement-based damage
High clear speed in dense packs
Reliable scaling with physical damage and area effects
Strong synergy with Slayer ascendancy sustain mechanics
Cyclone acts as the delivery system, while Void Shockwave provides explosive area clear that scales extremely well in dense Delirium or Breach encounters.
The result is a build that doesn't "attack" in bursts-it simply spins through content and detonates entire screens of enemies.
Defense Layer 1: Max Block at 78% (Near Cap Setup)
One of the core defensive pillars is an extremely high block chance-hovering around 78%, which is effectively the maximum practical threshold in most setups.
In Path of Exile, block-based builds rely heavily on consistency rather than raw mitigation. Every blocked hit is damage completely negated, making block one of the strongest defensive layers in the game when properly scaled.
However, this build goes a step further by introducing a critical mechanic: lucky block.
Forbidden Jewels: The "Lucky Block" Engine
The most powerful defensive interaction in this setup comes from:
Forbidden Flame
Forbidden Flesh
These unique jewels grant access to powerful ascendancy effects, including a key interaction:
Block chance becomes "lucky" after a successful block.
This mechanic effectively rolls block twice and takes the better result, dramatically increasing real-world survivability.
In practice, this means:
You block more often than your character sheet suggests
Chain hits become significantly less dangerous
Burst damage becomes far less consistent against you
When paired with high block chance, it creates the illusion of invincibility-especially in dense mapping scenarios like Breach + Delirium stacks.
Offensive Scaling: Cyclone + Void Shockwave Damage Loop
While defense is the focus, the build still reaches respectable damage levels-around 2 to 10 million DPS depending on buffs and map conditions.
Damage scaling comes from:
Physical damage investment
Cyclone hit frequency
Shockwave AoE scaling
Slayer ascendancy bonuses
Even though it's not a "glass cannon," it performs well enough to clear heavily juiced content without slowing down.
And because Cyclone is constant, damage uptime is effectively 100%.
Endgame Mapping Strategy: Breach + Delirium + Eater Influence
A large part of the build's identity comes from farming heavily juiced maps, including:
Breach mechanics
Beyond monster packs
Delirium scaling (including 100% delirious maps)
Eater of Worlds influence mechanics
These systems stack enemy density to extreme levels, creating situations where hundreds of monsters can spawn simultaneously.
The build thrives here because:
Block reduces incoming damage spikes
Cyclone prevents positioning issues
Shockwave clears entire packs passively
Slayer sustain keeps recovery consistent
Even when the screen becomes unreadable due to density, the build continues functioning.
Currency Farming Philosophy: "Tank Everything, Spin Forever"
The goal of this setup isn't just survival-it's efficiency farming.
In optimized maps, the player uses:
Orbs of Alchemy for baseline conversion
Delirium Orbs for scaling rewards
Scarabs and influence stacking
Currency rarity and quantity modifiers
When fully juiced, these maps can produce massive returns-but only if the build can survive long enough to clear them.
This is where the Slayer Cyclone setup shines: it removes the need for repositioning and minimizes downtime between kills.The Weakness: Critical Damage Spikes in 100% Delirium Maps
Despite the "unkillable" label, the build reveals a key weakness during extreme content:
Critical strike burst damage
In 100% Delirium maps, enemy scaling becomes unpredictable.
Even with max block, certain mechanics can bypass or overwhelm defenses:
Crit multipliers from rare monsters
Overlapping projectile bursts
Delirium scaling damage spikes
Penetration effects against block layers
This leads to situations where:
Health drops unexpectedly despite high mitigation
Block feels inconsistent under extreme pressure
Defensive layers are overwhelmed by stacked modifiers
The player even identifies this mid-run: everything works-except crit protection.
Defensive Adjustment: Fixing the Critical Weakness
To stabilize the build further, the missing layer is clear:
Reduced Extra Damage from Critical Strikes
In high-end mapping within Path of Exile, crit mitigation is often the difference between "strong build" and "truly immortal build."
Once this layer is added, the build becomes significantly more stable in:
100% Delirium maps
Double Beyond encounters
Boss-juiced fractured maps
It fills the final gap in an otherwise extremely layered defense system.
Gear Investment Reality: The 400 Divine Ceiling
One important aspect of this build is cost.
The Forbidden Flame + Forbidden Flesh setup alone accounts for roughly:
~400 Divine Orbs total investment (combined jewel cost range)
This places the build firmly in the high-end category of Path of Exile progression, where optimization requires massive currency farming or trade efficiency.
At this level of investment, players are no longer just building characters-they are engineering systems designed to break map content.
Mapping Results: Why the Build Feels "Unkillable"
When everything functions correctly, the build produces a very specific gameplay loop:
1.Enter dense map (Breach + Delirium + Beyond)
2.Cyclone through entire monster waves
3.Block negates most incoming hits
4.Lucky block reduces variance spikes
5.Shockwave clears residual enemies
6.Slayer sustain keeps HP stable
The result is a build that can:
Ignore most map density
Sustain through constant damage
Continue spinning without repositioning
Clear currency-heavy content efficiently
This is the definition of a "comfort farming" endgame build.
Final Verdict: Powerful, But Not Truly Invincible
The Slayer Cyclone + Void Shockwave block build in Path of Exile is one of the strongest examples of layered defense meeting high-density farming efficiency.
It excels at:
Breach farming
More POE exalted orbs
Delirium mapping
Currency juicing strategies
High-density clear scenarios
But it still has limitations when pushed into extreme 100% Delirium + crit-heavy environments without full mitigation layering.
The takeaway is simple: the build is not unkillable by default-but it becomes extremely close when fully optimized.
And in Path of Exile, that distinction is everything.
Because at the highest level, survival isn't about being immune to damage-it's about making damage statistically irrelevant long enough to turn the entire map into currency.