Acheron moves, skills and special abilities

Toughness Break: 20 Gains 1 point(s) of Slashed Dream. Inflicts 1 stack(s) of Crimson Knot on a single target enemy, dealing Lightning damage equal to 80% of Acheron's ATK to this target, as well as Lightning damage equal to 30% of Acheron's ATK to adjacent targets.

Toughness Break: 20 Sequentially unleash Rainblade 3 times and Stygian Resurge 1 time, dealing Lightning damage up to 223% of Acheron's ATK to a single target enemy, as well as Lightning damage up to 180% of Acheron's ATK to other targets. Rainblade: Inflicts Lightning damage 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 inflicts Lightning damage equal to 9.0% of Acheron's ATK to all enemies. For every stack of Crimson Knot removed, this damage Multiplier is additionally increased, up to a maximum of 36.0% . Stygian Resurge: Inflicts Lightning damage 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.

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.

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

CRIT damage increases by 10.7%

Lightning damage increases by 4.8%

ATK increases by 6.0%

CRIT damage increases by 8.0%.

ATK increases by 6.0%

ATK increases by 4.0%

ATK increases by 8.0%

CRIT damage increases by 5.3%.

ATK increases by 4.0%

Lightning damage increases by 3.2%

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

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.

Toughness Break: 20 Immediately attacks the enemy. At the start of each wave, gains Quadrivalent Ascendance, dealing Lightning damage 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.

Toughness Break: 10 Inflicts Lightning damage equal to 50% of Acheron's ATK to a single target enemy.

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

Requirements / unlock: Eidolon 1

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.

Requirements / unlock: Eidolon 2

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

Requirements / unlock: Eidolon 3

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

Requirements / unlock: Eidolon 4

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

Requirements / unlock: Eidolon 5

Increases the All-Type RES PEN for the Ultimate damage dealt by Acheron by 20%. The damage dealt by Basic ATK and Skill will also be considered as Ultimate damage and can reduce enemy toughness regardless of Weakness Types. When Weakness is broken, triggers the Lightning Weakness Break effect.

Requirements / unlock: Eidolon 6