Honkai: Star Rail Acheron Build Guide: Relics, Stats, and Team Synergies

To build Acheron effectively in Honkai: Star Rail, equip her with the Pioneer Diver of Dead Waters cavern relic set and Izumo Gensei and Takama Divine Realm planar ornaments, reach a baseline of 134 Speed, and pair her with two debuff-applying Nihility supports like Pela or Silver Wolf. Prioritize pulling her signature Light Cone before her Eidolons to accelerate her debuff stack generation and ultimate frequency.

Light Cone Priorities

Acheron's ultimate mechanics depend heavily on debuff application, making Light Cone selection critical to her rotation speed.

Light Cone	Priority / Role	Primary Benefit
Signature Light Cone	Best-in-Slot (Top Priority)	Significantly increases ultimate stack generation rate and provides unconditional damage multipliers. Pull this before Eidolons.
Good Night and Sleep Well	Best F2P / Secondary Option	Delivers high damage multipliers based on active enemy debuffs. Requires consistent team debuff application to maintain maximum uptime.

If you are deciding between pulling for her signature Light Cone or her Eidolons, prioritize the signature Light Cone first. It fundamentally changes her debuff stack management, making her ultimate far easier to activate in shorter cycle counts.

Target Stat Thresholds

Acheron relies on critical hits and speed tuning to deliver her maximum damage output.

Critical Damage: Stack as high as possible on body relics and sub-stats. Aim for a 1:2 ratio with her total Critical Rate.
Speed: Aim for a baseline of 134 Speed to ensure frequent actions in endgame content without outpacing your debuff-applying supports.
Attack Percentage: Aim to reach at least 3,000 ATK. Beyond this point, additional Critical Damage rolls provide higher returns.
Critical Rate: Aim for 60% to 70% through relic sub-stats, set bonuses, and kit passives.

Best Relic Sets and Sub-stats

Acheron requires relic sets that convert team debuffs into offensive stats.

Relic Sets

Cavern Relics: Pioneer Diver of Dead Waters (4-piece). Increases damage dealt to debuffed targets and boosts Critical Rate and Critical Damage when applying debuffs.
Planar Ornaments: Izumo Gensei and Takama Divine Realm (2-piece). Provides flat Critical Rate bonuses when paired with team members of the same Path (Nihility).

Sub-stat Priority Order

Critical Damage (Primary ultimate scaling)
Speed (Reach the 134 threshold)
Attack Percentage (Base damage scaling up to 3,000 ATK)
Critical Rate (Fill remaining gap to reach 60–70%)

Eidolon Investment Stopping Points

For players planning Warp pulls beyond E0, Acheron's early Eidolons provide significant power spikes:

E1: Grants a flat Critical Rate increase against debuffed enemies, easing relic sub-stat requirements and allowing full focus on Critical Damage.
E2 (Recommended Stopping Point): Reduces the required Nihility teammates from two to one while maximizing her passive trace damage. This opens up a dedicated team slot for a Harmony support character.
E3+: Delivers direct damage scaling, but offers diminishing utility compared to the team-building flexibility unlocked at E2.

Team Composition and Synergies

Acheron cannot rely solely on standard energy generation; her ultimate relies entirely on debuff stacks applied by her own actions and her teammates.

Core Team Structure (E0–E1): Acheron + 2 Nihility Debuffers + 1 Sustain
Optimal Teammates: Pela and Silver Wolf are ideal choices because they apply debuffs with standard attacks, skills, and ultimates, keeping Acheron's ultimate charge consistent.
Team Building Failure Point: Placing Acheron in teams without consistent debuff sources results in ultimate starvation, severely reducing her overall cycle efficiency.