Acheron
Yes for Nihility hypercarry—Acheron’s Ultimate still clears endgame. Ultimate “Slashed Dream Cries in Red” banks Slashed Dream / Crimson Knot toward a stacked Ultimate. Needs Jiaoqiu. Best partners: Pela / Silver Wolf / Aventurine. A4 wants two other Nihility paths (E2 softens the gate). Skip when you can’t field two Nihility supports for her stack engine.
Acheron is a 5★ Lightning Nihility Main DPS who casts her Ultimate off Slashed Dream stacks instead of Energy. Allies applying debuffs feed her stacks and Crimson Knot — at nine stacks she unleashes Rainblade slashes that detonate those knots for massive AoE Lightning damage. With two other Nihility characters she gains a separate 1.6× damage multiplier on Basic ATK, Skill, and Ultimate, and during her Ultimate she shreds all-type RES and breaks toughness regardless of weakness.
Overview
Quick Build
Light Cone
Along the Passing Shore
Signature BiS — Mirage Fizzle debuff grants an extra Slashed Dream point on Skill.
Relic Set
Pioneer Diver of Dead Waters (4pc) + Izumo Gensei and Takama Divine Realm (2pc)
Pioneer for debuff-scaled CRIT; Izumo when a Nihility ally shares her path.
Body
CRIT Rate%
Main stat
Feet
ATK%
Main stat
Sphere / Rope
ATK% / Lightning DMG% · ATK%
Substats
CRIT Rate ≥ CRIT DMG > ATK% > SPD (only if using SPD-set tech)
Strengths
- Burst kit built around one Ultimate: Rainblades into Stygian Resurge clear packs while ignoring Toughness type and applying all-type RES shred for the whole sequence—so she stays viable even when Lightning is not on the weakness list.
- Trace A4’s 1.6× personal damage multiplier (with two other Nihility allies) sits outside normal DMG% stacking, so her ceiling does not depend on borrowing Robin, Ruan Mei, or Sparkle from the other Memory of Chaos side.
- Debuff teammates double as fuel—every ally application feeds Slashed Dream and Crimson Knot—so well-built Nihility cores keep Ultimates cycling in MoC and Pure Fiction without Energy-battery supports.
- Technique Quadrivalent Ascendance can delete overworld trash instantly and, in real fights, still opens each wave with free Slashed Dream / Crimson Knot progress toward the next Ultimate.
Weaknesses
- Full A4 scaling wants three Nihility characters on the roster (E2 lowers that to two paths total); swapping in Harmony for the second Nihility slot only works with well-built supports and still forgoes part of her multiplier.
- Most of her damage is booked into one Ultimate—Rainblades that remove too few Crimson Knot stacks, or hit the wrong enemy in multi-target fights, can waste the bulk of the rotation.
- Basic ATK and Skill ratios are modest compared with many newer 3.x carries; she climbs tiers through debuff-fed stacking, type-agnostic break, and RES shred during Ult—not steady single-target Skill spam.
- Warp 4★ Nihility cones cover her well, but free and story options skew toward DoT kits and usually cannot apply debuffs for extra Slashed Dream; healers or shields that never debuff slow Ult cadence unless you build around specific cone or teammate setups.
Trace Priority
Rainblade / Stygian Resurge scale all endgame damage — level first.
Slashed Dream cap, RES shred during Ultimate, and Crimson Knot routing.
Primary way to gain Slashed Dream and spread Crimson Knot in combat.
Low contribution outside filling gaps — leave for last.
Stat Priority
Let allies apply debuffs before you Skill — each debuff hit adds Slashed Dream and Crimson Knot. At 9 stacks, use Ultimate and aim each Rainblade at enemies showing 3+ Crimson Knot stacks (Auto handles this well). After Ultimate, spend any remaining Slashed Dream via Skill before the next cycle.
Open supports first, then spend the carry’s Skill/Ult inside the buff window. Exact order varies by the team tab above.
Light Cones
CRIT DMG · Signature 5★
Increases the wearer's CRIT DMG by 36%. When the wearer hits an enemy target, inflicts Mirage Fizzle on the enemy, lasting for 1 turn. Each time the wearer attacks, this effect can only trigger 1 time on each target. The wearer deals 24% increased DMG to targets afflicted with Mirage Fizzle, and the DMG dealt by Ultimate additionally increases by 24%.
Why it works —Clear BiS — the on-hit debuff turns each Skill into two Slashed Dream points and amplifies Ultimate, where most of her damage comes from.
ATK% · 4★
For every debuff the target enemy has, the DMG dealt by the wearer increases by 12%, stacking up to 3 time(s). This effect also applies to DoT.
Why it works —Best 4★ option — three debuff types from your team are easy to maintain for 36% DMG per stack (72% at three types). Cannot apply its own debuff for Slashed Dream.
CRIT Rate · 4★
Increase the wearer's CRIT Rate by 8%. The wearer deals 24% more CRIT DMG to enemies that are currently Slowed or have reduced DEF.
Why it works —Strong CRIT stat stick if your Nihility supports can keep Slow or DEF RED up.
Effect Hit Rate · 5★
Increases the wearer's Effect Hit Rate by 24%. When the wearer deals DMG to an enemy that currently has 3 or more debuffs, increases the wearer's CRIT Rate by 12%. After the wearer uses their Basic ATK, Skill, or Ultimate, there is a 100% base chance to implant Aether Code on a random hit target that does not yet have it. Targets with Aether Code receive 12% increased DMG for 1 turn.
Why it works —Usable if you already own it, but Effect Hit Rate is wasted on Acheron and Aether Code applies after the attack — less consistent than signature or GNSW.
ATK% · 4★
Increases the wearer's ATK by 16%. After the wearer uses their Ultimate, increases their DMG dealt by 18%, lasting for 1 turn(s).
Why it works —Solid budget cone from events — simple ATK and post-Ult DMG that fits her burst pattern.
Relics
Team Compositions
Primary Nihility stack team for Acheron. Jiaoqiu, Pela, Aventurine are the partners the kit / endgame clears assume first.
Core carry for this shell — owns the damage plan and sets the rotation pace.
Jiaoqiu stacks shred / vulnerability the carry’s kit assumes every cycle.
Pela stacks shred / vulnerability the carry’s kit assumes every cycle.
Aventurine shields the hypercarry and softens MoC / AS chip so glass DPS can commit to Skill spam.
Traces & Eidolons
Traces
Deals Lightning DMG equal to 140% of Acheron's ATK to one designated enemy target.
Gains 1 point(s) of "Slashed Dream." Inflicts 1 stack(s) of "Crimson Knot" on one designated enemy target, dealing Lightning DMG equal to 200% of Acheron's ATK to this target, as well as Lightning DMG equal to 75% of Acheron's ATK to adjacent targets.
Sequentially unleash "Rainblade" 3 times and "Stygian Resurge" 1 time, dealing Lightning DMG up to 446% of Acheron's ATK to one designated enemy target, as well as Lightning DMG up to 360% of Acheron's ATK to other targets. "Rainblade": Deals Lightning DMG equal to 28.8% of Acheron's ATK to one designated enemy target and removes up to 3 stacks of "Crimson Knot" from the target. When "Crimson Knot" is removed, immediately deals Lightning DMG equal to 18.0% of Acheron's ATK to all enemies. For every stack of "Crimson Knot" removed, this DMG Multiplier is additionally increased, up to a maximum of 72.0%. "Stygian Resurge": Deals Lightning DMG equal to 144% of Acheron's ATK to all enemies and remove all "Crimson Knots." "Crimson Knot" cannot be applied to enemies during the Ultimate.
When Slashed Dream reaches 9 point(s), the Ultimate can be activated. During the Ultimate, reduces enemies' Toughness regardless of Weakness Types and reduces all enemies' All-Type RES by 25%, lasting until the end of the Ultimate. When any unit inflicts debuffs on an enemy target while using their ability, Acheron gains 1 point of Slashed Dream and inflicts 1 stack of Crimson Knot on a target. If debuffs are inflicted on multiple targets, then the 1 stack of Crimson Knot will be inflicted on the enemy target with the most Crimson Knot stacks. This effect can only trigger once for every ability use. After an enemy target exits the field or gets defeated by any unit while Acheron is on the field, their Crimson Knot stacks will be transferred to the enemy target with the most Crimson Knot stacks on the whole field.
Immediately attacks the enemy. At the start of each wave, gains Quadrivalent Ascendance, dealing Lightning DMG equal to 200% of Acheron's ATK to all enemies and reducing Toughness of all enemies irrespective of Weakness Types. When breaking Weaknesses, triggers the Lightning Weakness Break effect. Quadrivalent Ascendance: After using the Ultimate, Acheron gains 1 point(s) of Slashed Dream and inflicts 1 stack(s) of Crimson Knot on a single random enemy. If attacking a normal enemy, immediately defeats them without entering combat. When not hitting enemies, no Technique Points are consumed.
Deals minor Lightning DMG to one enemy, and removes up to 3 stacks of "Crimson Knot" from the target. When "Crimson Knot" is removed, deals minor Lightning DMG to all enemies 1 time, with this DMG multiplier increased for every stack of "Crimson Knot" removed.
Deals Lightning DMG to all enemies and removes all Crimson Knots.
Eidolons
When dealing DMG to debuffed enemies, increases CRIT Rate by 18%.
Is it worth getting?
Comfortable CRIT padding in debuff-heavy teams. Nice to have, not a stopping point on its own.
The number of Nihility characters required for the Trace "The Abyss" to achieve its highest possible effect is reduced by 1. When this unit's turn starts, gains 1 point of Slashed Dream and inflicts 1 stack of Crimson Knot on the enemy with the most Crimson Knot stacks.
Is it worth getting?
Her defining eidolon — unlocks max A4 multiplier with only one Nihility ally and smooths every Ultimate cycle. Pull if you main her.
Ultimate Lv. +2, up to a maximum of Lv. 15. Basic ATK Lv. +1, up to a maximum of Lv. 10.
Is it worth getting?
Talent-level boost only. Take it if you roll it; never chase over E2.
When enemy targets enter combat, inflicts them with the Ultimate DMG Vulnerability, increasing the amount of Ultimate DMG they take by 8%.
Is it worth getting?
Small but permanent Ultimate vuln in multi-wave content. Bonus, not a build-defining stop.
Skill Lv. +2, up to a maximum of Lv. 15. Talent Lv. +2, up to a maximum of Lv. 15.
Is it worth getting?
Skill-level constellation on the way to E6 — skip as a goal.
Increases the All-Type RES PEN for the Ultimate DMG dealt by Acheron by 20%. The DMG dealt by Basic ATK and Skill will also be considered as Ultimate DMG and can Reduce enemy Toughness regardless of Weakness Types. When Weakness is broken, triggers the Lightning Weakness Break effect.
Is it worth getting?
Whale ceiling — turns Basic ATK and Skill into Ultimate-tier hits with extra RES PEN. Only for dedicated copium.
Acheron is fully usable at E0. Dedicated mains often stop at E0 before chasing higher. First stop: E0. Endgame target: E0.
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