Acheron — Honkai Star Rail Character Guide

Overview

Stack-based Nihility DPS who ignores weakness types and shreds All-Type RES during her Ultimate. Gains a massive separate DMG multiplier with Nihility teammates, freeing premium Harmony supports for other teams.

Stack-based Nihility DPS whose Ultimate replaces the standard Energy system with Slashed Dream points (9 to activate). Stacks are generated by Acheron's own Skill (+1) and whenever any ally inflicts a debuff on an enemy (+1). During her Ultimate, she unleashes 3 targeted Rainblades that consume Crimson Knot stacks for bonus AoE DMG, followed by a Stygian Resurge finisher hitting all enemies. The Talent provides 20% All-Type RES reduction and Toughness reduction regardless of Weakness Types during the entire Ultimate sequence.

Key Mechanics

• Requires 2 Nihility teammates (3 total including Acheron) at E0-E1 to activate the full 160% A4 separate DMG multiplier. Dropping to 1 Nihility teammate reduces the multiplier to 115% — a major damage loss. E2 reduces the requirement by 1.
• Slashed Dream generation rate determines Ultimate frequency. Each ally ability that inflicts a debuff grants 1 stack; Acheron's own Skill grants 1 stack. Signature LC adds a debuff per attack, doubling Skill generation to 2 stacks. Jiaoqiu uniquely generates stacks during enemy turns.
• Crimson Knot management is critical for Ultimate damage. Each of the 3 Rainblades should target an enemy with at least 3 Crimson Knot stacks to maximize the AoE DMG component. The Auto AI handles targeting correctly.
• Does not use the Energy system at all — Energy-related buffs and effects (Tingyun Energy restore, Energy Regeneration Rate) provide zero value. Only Slashed Dream generation matters.
• CRIT scaling is the dominant damage stat. Unlike Break or DoT characters, Acheron scales purely with ATK, CRIT Rate, CRIT DMG, and DMG%. The A4 separate multiplier and A6 DMG% stacking provide substantial self-buffing, reducing reliance on Harmony supports.

Best Acheron Teams

Ashveil Dual Carry

E0-accessible dual-carry shell where Ashveil replaces the second dedicated Nihility debuffer as a sub-DPS. Acheron keeps at least 2 Nihility characters total for a baseline A4 multiplier and Slashed Dream engine, while Ashveil adds 40% DEF Reduction, Bait uptime, and heavy follow-up/Ultimate damage.

• S-tier: Acheron, Ashveil, Mortenax Blade, Dan Heng • Permansor Terrae
• A-tier: Acheron, Ashveil, Jiaoqiu, Dan Heng • Permansor Terrae
• A-tier: Acheron, Ashveil, Cipher, Dan Heng • Permansor Terrae

Double Nihility Hypercarry

Standard Acheron composition with two Nihility debuffers. Maximizes the A4 trace bonus (160% separate DMG multiplier applied after all other calculations) while maintaining consistent Slashed Dream generation through ally debuffs. Because the A4 multiplier bypasses diminishing returns entirely, this is Acheron's highest damage ceiling at E0-E1. Works at all eidolon levels.

• S-tier: Acheron, Mortenax Blade, Cipher, Dan Heng • Permansor Terrae
• A-tier: Acheron, Cipher, Silver Wolf, Dan Heng • Permansor Terrae
• B-tier: Acheron, Pela, Silver Wolf, Aventurine
• A-tier: Acheron, Welt, Jiaoqiu, Pela
• A-tier: Acheron, Welt, Pela, Aventurine

Harmony Flex

E2-exclusive composition replacing the second Nihility slot with a Harmony support. E2 reduces A4 requirement from 2 Nihility to 1, preserving the full 160% separate DMG multiplier while enabling action advancers like Sunday or Sparkle to dramatically accelerate Slashed Dream generation through rapid Skill usage. Combined with E2's turn-start stack, Acheron can generate 3+ stacks per cycle and maintain extremely short Ultimate rotations.

• S-tier: Acheron, Cipher, Tribbie, Dan Heng • Permansor Terrae
• A-tier: Acheron, Cipher, Sunday, Dan Heng • Permansor Terrae

Best Acheron Teammates

DPS Partners: Ashveil (S+)

Amplifiers: Mortenax Blade (S+), Jiaoqiu (S), Cipher (S), Pela (A), Silver Wolf (A), Welt (A), Tingyun • Fugue (B)

Sustains: Dan Heng • Permansor Terrae (S+), Aventurine (A), Fu Xuan (A), Hyacine (A), Gallagher (B)

Acheron Investment Priority

1. E1 — +18% CRIT Rate vs debuffed enemies — permanent uptime in optimal teams. Frees relic investment from CRIT Rate and lets you stack CRIT DMG instead. Strong recommended first target before signature.
2. LC S1 — Signature applies debuff on every attack, doubling Slashed Dream generation per Skill (2 stacks instead of 1) and providing a substantial Ultimate DMG boost. The fastest way to smooth out Acheron's rotation after E1.
3. E2 — Best spender stopping point. Reduces Nihility requirement from 2 to 1 for max A4 buff (160% separate DMG multiplier), opening the Harmony flex slot for Sunday/Sparkle/Tribbie. Also generates 1 Slashed Dream per turn start, accelerating Ultimate frequency by ~25%.

Acheron Relics and Stat Targets

Recommended: Pioneer Diver of Dead Waters with Izumo Gensei and Takama Divine Realm

Stat targets: CRIT Rate 70%+, CRIT DMG 160%+, SPD 101 or 135+, ATK 3000-3500

Main stats: Body: CRIT Rate > CRIT DMG · Feet: SPD > ATK% · Sphere: Lightning DMG > ATK% · Rope: ATK%

Best Acheron Light Cones

• Along the Passing Shore (Best in Slot): Signature LC with a substantial lead over all alternatives. The Mirage Fizzle debuff it applies on every attack doubles Slashed Dream generation per Skill (2 stacks instead of 1), dramatically smoothing rotation speed. Additionally provides significant Ultimate DMG bonus. The debuff also satisfies Nihility synergy checks independently.
• Incessant Rain: Applies 12% DMG Vulnerability debuff when attacking, but with heavy restrictions: only triggers after the attack ends, one target per attack, cannot reapply if debuff already exists, and can miss vs bosses without 67% EHR. The EHR stat line is entirely wasted on Acheron. The Aether Code debuff does generate Slashed Dream stacks when applied, but the constraints limit reliability.
• Good Night and Sleep Well: Best 4-star option. Provides up to 72% DMG boost at 3 debuff stacks, which is trivial to maintain with a proper debuff-heavy team. Requires high superimposition (S5 strongly recommended) to reach potential. Cannot apply debuffs itself — purely dependent on teammates for stacks. Limited banner rate-up only, making it harder to obtain than standard-pool alternatives.
• Boundless Choreo: Strong CRIT-focused alternative providing a permanent CRIT Rate boost plus bonus CRIT DMG vs Slowed or DEF-reduced enemies. Excellent for relic building flexibility — helps reach CRIT thresholds with less substat RNG. Requires a teammate applying Slow or DEF Reduction (Pela, Silver Wolf, Welt) to enable the conditional bonus reliably.

Acheron FAQ

Who works best with Acheron in HSR?

Acheron's best team options include Ashveil, Mortenax Blade, Dan Heng • Permansor Terrae. StarGuide rates teammates by role and composition fit so the recommendation reflects how the character is actually played.

What relics should Acheron use?

Acheron's recommended relic setup is Pioneer Diver of Dead Waters with Izumo Gensei and Takama Divine Realm, with stat targets around CRIT Rate 70%+, CRIT DMG 160%+, SPD 101 or 135+.

What is the best light cone for Acheron?

Along the Passing Shore is the top listed light cone for Acheron. Signature LC with a substantial lead over all alternatives. The Mirage Fizzle debuff it applies on every attack doubles Slashed Dream generation per Skill (2 stacks instead of 1), dramatically smoothing rotation speed. Additionally provides significant Ultimate DMG bonus. The debuff also satisfies Nihility synergy checks independently.

How should I invest in Acheron?

Acheron's first listed investment priority is E1. +18% CRIT Rate vs debuffed enemies — permanent uptime in optimal teams. Frees relic investment from CRIT Rate and lets you stack CRIT DMG instead. Strong recommended first target before signature.

Important Notes

• Requires 2 Nihility teammates at E0-E1 for max A4 multiplier (160%) — dropping to 1 Nihility cuts it to 115%, a major damage loss
• Without Jiaoqiu, stack generation slows significantly in modern endgame — he generates stacks during enemy turns that no other support replicates
• Signature LC provides largest consistent performance gap of any Nihility LC — doubles Skill stack generation rate
• Sustain choices should prioritize debuff access: Trend of the Universal Market on Aventurine/Fu Xuan, or natural debuffers like Gallagher and Hyacine with signature
• E0 base CRIT Rate is low — requires strong relics or E1 to reach the 70-80% CRIT Rate threshold needed for consistent damage