Honkai: Star Rail Acheron Build

Trilateral Wiltcross

Single Target

Deals Lightning DMG equal to 50% of Acheron's ATK to a single target enemy.

Octobolt Flash

Blast

Gains 1 point(s) of Slashed Dream. Inflicts 1 stack(s) of Crimson Knot on a single target enemy, dealing Lightning DMG equal to 80% of Acheron's ATK to this target, as well as Lightning DMG equal to 30% of Acheron's ATK to adjacent targets.

Slashed Dream Cries in Red

AoE

Sequentially unleash Rainblade 3 times and Stygian Resurge 1 time, dealing Lightning DMG up to 223.2% of Acheron's ATK to a single target enemy, as well as Lightning DMG up to 180% of Acheron's ATK to other targets. Rainblade: Deals Lightning DMG equal to 14.4% of Acheron's ATK to a single target enemy and removes up to 3 stacks of Crimson Knot from the target. When Crimson Knot is removed, immediately deals Lightning DMG equal to 9% 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 36%. Stygian Resurge: Deals Lightning DMG equal to 72% of Acheron's ATK to all enemies and remove all Crimson Knots. Crimson Knot cannot be applied to enemies during the Ultimate.

Atop Rainleaf Hangs Oneness

Enhance

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 10%, 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 the 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 per every ability usage. 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.

Quadrivalent Ascendance

Break

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 Weakness is broken, 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.

Silenced Sky Spake Sooth

CRIT Rate increases by 18% when dealing DMG to debuffed enemies.

Mute Thunder in Still Tempest

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.

Frost Bites in Death

Ultimate Lv. +2, up to a maximum of Lv. 15. Basic ATK Lv. +1, up to a maximum of Lv. 10.

Shrined Fire for Mirrored Soul

When enemy targets enter combat, afflict them with the Ultimate DMG Vulnerable Vulnerability state, increasing the amount of Ultimate DMG they take by 8%.

Strewn Souls on Erased Earths

Skill Lv. +2, up to a maximum of Lv. 15. Talent Lv. +2, up to a maximum of Lv. 15.

Apocalypse, the Emancipator

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.

Red Oni

When battle starts, immediately gains 5 point(s) of Slashed Dream and applies 5 stack(s) of Crimson Knot to a random enemy. When Slashed Dream reaches its upper limit, for every point of Slashed Dream that exceeds the limit, gains 1 stack of Quadrivalent Ascendance. Increases the maximum stackable count for Quadrivalent Ascendance to 3.

The Abyss

When there are 1 or 2 Nihility characters other than Acheron in the team, the DMG dealt by Acheron's Basic ATK, Skill, and Ultimate increases to 115% or 160% of the original DMG respectively.

Thunder Core

When the Rainblade from Acheron's Ultimate hits enemy targets with Crimson Knot, her DMG increases by 30%, stacking up to 3 time(s) and lasting for 3 turn(s). And when Stygian Resurge triggers, additionally deals DMG for 6 times. Each time deals Lightning DMG equal to 25% of Acheron's ATK to a single random enemy and is viewed as part of the Ultimate DMG.