For players who've conquered the main story of Honkai: Star Rail, the real endgame begins—perfecting character builds. When it comes to building Acheron, the five-star Nihility DPS who rewrites the rules of Ultimate mechanics, the process is like trying to solve a quantum physics equation while riding a rollercoaster. Her kit isn't just powerful; it's a labyrinth of synergies and stat priorities that demands careful navigation. This guide will break down everything you need to transform Acheron from a collection of pixels into a thunderstorm of destruction.

⚡ Best Acheron Relics & Planar Ornaments

Choosing the right equipment for Acheron is more critical than finding a single specific grain of sand on a beach—get it wrong, and her damage potential plummets. Relics and Planar Ornaments form the foundation of her build, providing both raw stats and powerful set bonuses.

Relic Set Recommendations:

Type	Name	Why It Works for Acheron
Best in Slot	Pioneer Diver of Dead Waters	Perfect synergy! Increases damage against debuffed enemies AND boosts Crit Rate/DMG based on enemy debuffs. Crucial note: Crimson Knot doesn't count as a debuff for the self-applied bonus.
Strong Alternative	Band of Sizzling Thunder	Reduces diminishing returns since Acheron gets tons of DMG% bonuses elsewhere. The 4-piece ATK% boost complements her kit beautifully.
Situational Pick	Genius of Brilliant Stars	Nearly matches best-in-slot value against Quantum-weak enemies, but makes achieving optimal Crit Ratio trickier.

Planar Ornament Sets:

• Izumo Gensei and Takama Divine Realm 🏆 - The absolute best, tailor-made for Acheron. Provides essential ATK% while boosting Crit Rate.

• Inert Salsotto - Excellent alternative if you haven't unlocked World Nine. Grants 8% Crit Rate + 15% Ultimate DMG boost.

• Sigonia, the Unclaimed Desolation - Nuclear option! Delivers a massive 40% Crit DMG bonus, but only shines in content where you defeat enemies rapidly (like Pure Fiction).

📊 Acheron Relic Stat Priority: The Nitty-Gritty

While set bonuses matter, individual relic stats are where the real magic happens. Think of it like baking a cake—the right ingredients in the right proportions make all the difference.

Piece	Main Stat Priority	Sub Stat Priority
Head	HP	Crit DMG/Rate > ATK% > SPD
Hands	ATK	Crit DMG/Rate > ATK% > SPD
Body	Crit Rate/DMG	Crit DMG/Rate > ATK% > SPD
Feet	ATK% OR SPD*	Crit DMG/Rate > ATK% > SPD
Planar Sphere	Lightning DMG% > ATK%	Crit DMG/Rate > ATK% > SPD
Link Rope	ATK%	Crit DMG/Rate > SPD

*Feet Piece Dilemma: This choice depends on your team composition like a key fitting a specific lock:

• ATK% Boots: Use with E0 Acheron + 2 Nihility teammates (they provide Energy)

• SPD Boots: Essential for E2 Acheron + Harmony support teams (needs faster turns)

🌌 Best Acheron Light Cones

Acheron's Light Cone options are more limited than her relic choices, with the top picks locked behind the gacha system. Here's the breakdown from best to "good enough for now":

1. Along the Passing Shore (Signature) 💫 - The undisputed champion! Provides 36% Crit DMG and up to 48% Ultimate DMG boost—perfect for her Ultimate-focused kit.

2. Good Night and Sleep Well (4★) - Best four-star option, but has a major caveat: it doesn't apply debuffs, which reduces Pioneer relic set effectiveness.

3. Resolution Shines As Pearls of Sweat (4★) - At max Refinement, gives 16% DEF reduction (great debuff for Pioneer set synergy).

4. Incessant Rain (5★) - Excellent with multiple Nihility teammates. Provides 12% Crit Rate and applies its own damage-boosting debuff when enemies have 3+ debuffs.

5. Loop (3★) - Early-game placeholder only. Requires SPD reduction debuffs on enemies to function properly.

🔄 Acheron Trace Priority & Kit Explanation

Acheron's kit operates on principles that would make a Rube Goldberg machine look simple. Here's the simplified version:

Ultimate Stack Mechanics:

• Gain 1 stack when Acheron uses her Skill

• Gain 1 stack whenever ANY enemy receives ANY debuff (from allies OR enemies themselves!)

Ultimate Execution:

• At 9 stacks → Activate Ultimate

• Deals up to 4 damage instances based on Crimson Knot count

• Each instance consumes 3 Knots from main target

• Final hit receives massive damage buff based on total Knots consumed

Trace Upgrade Priority:

1. Ultimate (Max First!) → Her entire damage identity

2. Talent → Increases RES PEN

3. Skill → Last priority

Don't forget: Unlock all her bonus abilities ASAP—they're not optional upgrades!

🤔 Is Acheron Worth Pulling in 2025?

If the cinematic trailers haven't convinced you, consider this: Acheron delivers some of the highest single-attack damage numbers in the game even at E0. She's like a precision-engineered Swiss watch in a world of sundials—complex, but incredibly effective when properly assembled.

Current State (2025):

• Slight team restrictions exist due to limited optimal Nihility debuffers

• BUT this improves with every new character release

The Verdict: ✅ YES, PULL IF...

• You enjoy complex, high-skill-cap gameplay

• You want a future-proof investment (she'll only get better with time)

• You're willing to build specialized teams around her

• You appreciate characters who break conventional game mechanics

Acheron isn't just another DPS—she's a statement piece for your account, a character whose playstyle feels as rewarding as finally understanding a complex mathematical theorem. With the right build and team, she doesn't just defeat enemies; she erases them from existence with the elegance of a master painter completing their masterpiece.