Poison Blade Vortex Assassin Build Guide (Necropolis 3.24)

Key Takeaways

• Archetype: A poison-stacking caster that used Blade Vortex on the Shadow's Assassin ascendancy during Path of Exile's Necropolis 3.24 league.
• Core mechanic: Blade Vortex creates ethereal blades that orbit you and hit nearby enemies, layering poison stacks that scaled hard against bosses.
• Damage scaling: Each spinning blade adds 35% increased Hit Rate and 35% more Damage, up to 10 blades, so more hits per second meant more poison applications.
• Ascendancy (3.24): The build leaned on the pre-3.27 Assassin nodes - Toxic Delivery, Noxious Strike, Deadly Infusion, and Unstable Infusion for poison and crit.
• Strengths during the league: Strong single-target ramp, smooth bossing, and a low entry cost made it a friendly league-starter-to-bosser in Necropolis.
• Weaknesses: Ramp-up time (you had to stack blades before bursting) and reliance on staying in melee-ish range for the blades to connect.
• Status today: Necropolis 3.24 is a past league; the Assassin was reworked in 3.27 and Awakened Support Gems were removed in 3.28, so this guide is preserved as historical reference.

The sections below cover how each of these points worked during the 3.24 league.

Build Overview

The Poison Blade Vortex Assassin was a popular poison-caster setup during the Necropolis 3.24 league (April to July 2024). It paired one of Path of Exile's most reliable damage-stacking spells with the Shadow's poison-focused ascendancy to produce a build that ramped from clearing trash packs into deleting bosses. This guide preserves how the build played at the time, using the gem balance and ascendancy nodes that were live during 3.24.

The idea was simple. You cast Blade Vortex to spin up a set of orbiting blades, each blade adding more hits per second. Because the build converted hits into poison stacks, every additional blade meant more poison being applied, and poison is a damage-over-time effect that adds up against tanky targets. The Assassin's poison and critical-strike nodes amplified both the chance to poison and the damage each poison dealt.

During Necropolis, this archetype offered a friendly difficulty curve. It was cheap to start, scaled cleanly with investment, and did not depend on a single chase unique to function. That combination made it a common pick for players who wanted a build that could both farm the league mechanic and push deeper boss content.

How Blade Vortex Works

Blade Vortex is a Spell with the AoE, Duration, and Physical tags. When cast, it summons ethereal blades that orbit in an area around you, dealing damage on a fixed interval to every enemy in their radius. As you add more blades, the damage becomes both greater and more frequent.

A few mechanics defined how the skill was played in 3.24:

• Stacking blades: You could maintain up to 10 active blades at once. Each blade adds 35% increased Hit Rate and 35% more Damage, so a full stack hit far faster and harder than a single blade.
• Independent durations: Each blade carried its own duration of 4.00 seconds (reduced from 5 seconds back in patch 3.14.0). You re-cast to refresh and maintain the stack.
• Hit interval: With one blade the hit interval is 0.6 seconds, and the blades spin faster as you add more, raising the effective hits per second.
• One effect at a time: Only one Blade Vortex effect can be active at once. Casting again while it is active adds a stack rather than starting a fresh effect, and the first cast bakes in the "on cast" modifiers for the whole instance.

One thing that confused many players: the in-game tooltip DPS for Blade Vortex was misleading. The tooltip showed average damage per hit multiplied by cast speed, but real throughput scaled with how many hits per second the spinning blades produced over their duration, not with cast speed. For a poison build this mattered even more, because poison damage is applied on hit and rolls out over time, so the meaningful number was hits-per-second feeding poison stacks rather than the tooltip figure.

Why Poison and Assassin

Poison is a stacking damage-over-time ailment, and Blade Vortex is one of the best poison delivery skills in Path of Exile because it produces a high volume of hits. Every hit can apply a poison, and those poisons stack additively, so a fast-spinning Blade Vortex against a boss layered dozens of simultaneous poisons. The more hits per second, the higher the poison floor.

The Shadow's Assassin ascendancy was the natural home for this during Necropolis. At the time, before the 3.27 rework, the Assassin's notable nodes were built around critical strikes and poison damage. The build chose nodes that boosted poison damage and the chance to inflict it, while crit improved both the base hits and the poison those hits seeded.

✏️ Technique tip: Pre-stack blades before each boss encounter — cast Blade Vortex 5-6 times just before the fight opens. A full 10-blade stack hits nearly twice as frequently as a 5-blade stack. Wasting the first casts during an opening mechanic means half your DPS window bleeds into downtime.

Ascendancy Nodes (Necropolis 3.24)

During Necropolis 3.24 the Assassin used its pre-3.27 node set. The build prioritized the poison and critical-strike notables below.

Other notables from that era of the Assassin tree included Ambush and Assassinate, Mistwalker, and Opportunistic. Players tailored the final two points to their defensive and offensive needs.

It is worth noting for historical clarity that the Assassin was reworked in patch 3.27.0. That rework removed Deadly Infusion, Ambush and Assassinate, and Noxious Strike, and introduced new notables such as Infused Toxins, Assassination Style, Deathmarked, Mystical Infusion, and Shadowed Blood. If you are reading this against a current league, the node names above no longer exist in the game - they are preserved here because they were correct for 3.24.

Skill Gem Links

The main link group centered on Blade Vortex supported by gems that boosted poison, damage over time, and added chaos or physical damage. During Necropolis 3.24, top-end versions of this build commonly slotted Awakened Support Gems for the extra levels and quality.

Auras and utility gems filled the remaining sockets - typically Malevolence for damage over time, a movement skill, and curses such as Despair to lower enemy chaos resistance. A note on the gems above: during 3.24 the highest-budget builds used Awakened versions of these supports where available. That was historically accurate for the league, but Awakened Support Gems were removed in patch 3.28 and are now legacy-only, so this is preserved as a record of how the build was geared at the time rather than current advice.

📌 Common mistake: Do not evaluate Blade Vortex support gems using the tooltip DPS number. The tooltip multiplies average hit damage by cast speed, but poison throughput scales with hits-per-second from the spinning blades. Vile Toxins and Unbound Ailments produce far more actual damage than their tooltip entry implies — trust a DoT damage calculator, not the gem tooltip.

Gearing Priorities

The build did not require a single chase unique to function, which is part of why it was approachable. The gearing goals were focused and could be acquired incrementally:

• Chaos damage over time and poison multipliers: The single most impactful stat group, found on amulets, gloves, and the passive tree.
• Critical strike chance and multiplier: Better crits meant better hits and stronger poisons via the Assassin nodes.
• Life and chaos resistance: Survivability anchors, since the build sat in fairly close range while blades connected.
• Cast speed: Helped ramp the blade stack faster and refresh durations more comfortably.
• Skill duration: Made the spinning blades linger longer between recasts.

A Path of Building import for this build was available via pobb.in but the link has expired as Necropolis is a past league. If you want to rebuild it for reference, recreate the gem links and ascendancy choices listed above in a current Path of Building install and select Patch 3.24 to match the league's balance.

Playstyle and Mapping

In practice the build asked you to cast Blade Vortex a few times to spin up your stack, then run through packs while the orbiting blades shredded everything nearby. Because blades hit on an interval and applied poison on each hit, clear speed felt smooth once you were at a full stack. For bosses, you stacked blades, stayed close enough for the blades to connect, and let poison ramp while you dodged.

The main thing to manage was ramp. Unlike a one-shot spell, Blade Vortex needed a moment to reach full power, so the pattern was to pre-stack before a dangerous fight and to keep refreshing the stack so it never dropped off. Curses and an ailment-boosting aura rounded out the rotation.

Strengths and Weaknesses

Despite its weaknesses, the build remained one of the more accessible boss-killers available during Necropolis.

Summary

The Poison Blade Vortex Assassin was a dependable, budget-friendly poison caster during Path of Exile's Necropolis 3.24 league. It combined Blade Vortex's high hit volume with the Shadow Assassin's poison and crit nodes to produce a build that cleared packs smoothly and ramped into serious single-target damage against bosses. Its main quirks were ramp-up time and the need to fight in close range, but its low entry cost made it a strong league-starter-to-bosser at the time.

Because Necropolis 3.24 is a past league, the Assassin rework in 3.27 and the removal of Awakened Support Gems in 3.28 mean parts of this setup no longer exist in the live game. Treat this as a historical reference for how the build played during its league rather than a current build to copy verbatim. Players looking to skip the grind on currency, builds, or progression can explore WowCarry's PoE 2 boosting services for the current meta.

Last reviewed 2026-06-11 against Patch 3.24 Necropolis - Maintained by WowCarry's PoE team.

Frequently Asked Questions

Is the Poison Blade Vortex Assassin still viable in current Path of Exile?

This specific build was tuned for Necropolis 3.24. Blade Vortex is still in the game, but the Assassin ascendancy was reworked in patch 3.27 and Awakened Support Gems were removed in 3.28, so the exact node and gem setup here no longer matches the live game. Poison Blade Vortex remains a recognized archetype, but you would need an updated guide for the current league's nodes and gems.

How does Blade Vortex apply poison?

Blade Vortex hits nearby enemies on a fixed interval as its blades spin. Each hit can apply a poison, and poisons stack, so a fast-spinning full stack of blades layers many poisons at once. With more blades the hit rate rises, which means more poison applications per second and higher overall damage over time.

How many Blade Vortex blades can you have at once?

You can maintain up to 10 active blades. Each blade adds 35% increased Hit Rate and 35% more Damage, so reaching a full stack of 10 is a big step up from a single blade in both how fast and how hard the skill hits.

Why was the Blade Vortex tooltip DPS misleading?

The in-game tooltip multiplied average damage per hit by cast speed, but Blade Vortex's real throughput came from how many hits per second the spinning blades produced over their duration, not from cast speed. For a poison build, the number that mattered most was hits-per-second feeding poison stacks, which the tooltip did not represent.

What gear did the Blade Vortex Assassin need?

The build prioritized chaos damage over time and poison multipliers, critical strike chance and multiplier, life, chaos resistance, cast speed, and skill duration. It did not require a single mandatory chase unique, which kept the entry cost low and let you upgrade incrementally.

Which ascendancy nodes did it use in Necropolis 3.24?

During 3.24 it used the pre-3.27 Assassin notables, leaning on Toxic Delivery, Noxious Strike, Deadly Infusion, and Unstable Infusion for poison and critical-strike scaling. Those nodes were removed or replaced in the 3.27 Assassin rework, so they only apply to the 3.24 league.

Was Blade Vortex changed during Necropolis 3.24?

No Blade Vortex-specific changes were recorded for the 3.24 league. The last significant change to the skill was in patch 3.14.0, which reduced its base duration from 5 to 4 seconds, shrank its radius, and lowered its added-damage effectiveness. The skill was present and fully playable throughout Necropolis.

Where can I find the original Path of Building import?

A Path of Building import was shared via pobb.in during the league, but that link has expired because shared pobb.in builds do not persist and Necropolis is now a past league. To recreate it, rebuild the gem links and ascendancy choices from this guide in Path of Building and set it to Patch 3.24.