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Acheron
Honkai: Star Rail · Character

Acheron

Lightning Nihility damage dealer who charges a powerful Ultimate through debuffs

Released Mar 27, 2024

Acheron builds Slashed Dream when units inflict debuffs with abilities, then spends it on a multi-part Lightning Ultimate that removes Crimson Knots and deals extra damage as they are removed. Consider her when the party can apply debuffs through abilities and focus attacks on enemies carrying Crimson Knots.

ElementThunderPathNihilityRarity5
Acheron GUIDE

Understand Acheron

Useful when…

  • Building toward an Ultimate through debuff applications
  • Using Crimson Knot removal to add area damage during the Ultimate
  • Attacking overworld enemies with her Technique, which can defeat normal enemies without combat

How are Slashed Dream and Crimson Knot gained?

Her Skill gives one Slashed Dream point and one Crimson Knot to its target, with Lightning damage to that enemy and adjacent targets. The Talent requires nine Slashed Dream points to activate the Ultimate. Whenever any unit inflicts a debuff on an enemy using an ability, Acheron gains one point and applies one Crimson Knot; this can trigger once per ability use, even if several enemies receive debuffs, and the Knot goes to the enemy with the most existing Knots. If an enemy leaves the field or is defeated while she is present, its Knots transfer to the enemy with the most Knots. During the Ultimate, enemies lose Toughness regardless of Weakness Type and have All-Type RES reduced until the Ultimate ends.

What does the Ultimate do?

Slashed Dream Cries in Red attacks one designated target with three Rainblade hits and then hits all enemies with Stygian Resurge. Each Rainblade removes up to three Crimson Knot stacks from its target; removing Knots triggers damage to all enemies, and the multiplier rises with the number removed up to its stated cap. Stygian Resurge then damages all enemies and removes all remaining Knots. Crimson Knot cannot be applied during the Ultimate, so its removal uses the stacks already present. The Technique can defeat normal enemies immediately without entering combat; at each wave start it also damages all enemies and reduces Toughness regardless of Weakness Type.

What to upgrade?

The Ultimate is the main damage investment because it supplies the multi-hit sequence and Knot-removal damage. The Skill contributes direct damage and one point of setup, while the Talent controls the activation threshold and debuff-driven generation. Her listed bonus traces include ATK and CRIT DMG. The Technique is valuable for exploration and wave-start effects. Later levels cost more and require scarce materials; prioritize the central Ultimate and whichever setup ability is most relevant to how you use her. The supplied repeat Rainblade entries are separate components of the Ultimate, not distinct abilities to level separately.

What should players avoid assuming?

A multi-target debuff application still grants at most one Slashed Dream point per ability use, not one per enemy hit. Knots cannot be added during the Ultimate, and every Rainblade can remove at most three from its selected target before Stygian Resurge clears the remaining field-wide Knots. The described full effect depends on building points and stacks beforehand. Her Technique’s immediate defeat applies to normal enemies; it should not be read as an instant defeat for every enemy type.

Limitations and tradeoffs

  • Ultimate access depends on accumulating nine Slashed Dream points.
  • Debuffs on multiple enemies in one ability use still trigger the Talent only once.
  • The Technique’s immediate defeat is specifically described for normal enemies.

Common mistakes to avoid

  • Counting each enemy hit by a debuffing ability as a separate Slashed Dream trigger.
  • Expecting Crimson Knot to be applied during the Ultimate.
  • Assuming the Technique instantly defeats non-normal enemies.

Effects and reference details

Trilateral Wiltcross · Basic ATK

Deals Lightning DMG equal to 50% of Acheron's ATK to one designated enemy target.

Ability descriptions by source level. Purchased caps and bonus levels are separate.

Source levelEffect
1Deals Lightning DMG equal to 50% of Acheron's ATK to one designated enemy target.
2Deals Lightning DMG equal to 60% of Acheron's ATK to one designated enemy target.
3Deals Lightning DMG equal to 70% of Acheron's ATK to one designated enemy target.
4Deals Lightning DMG equal to 80% of Acheron's ATK to one designated enemy target.
5Deals Lightning DMG equal to 90% of Acheron's ATK to one designated enemy target.
6Deals Lightning DMG equal to 100% of Acheron's ATK to one designated enemy target.
7Deals Lightning DMG equal to 110% of Acheron's ATK to one designated enemy target.
8Deals Lightning DMG equal to 120% of Acheron's ATK to one designated enemy target.
9Deals Lightning DMG equal to 130% of Acheron's ATK to one designated enemy target.
10Deals Lightning DMG equal to 140% of Acheron's ATK to one designated enemy target.
Octobolt Flash · Skill

Gains 1 point(s) of "Slashed Dream." Inflicts 1 stack(s) of "Crimson Knot" on one designated enemy target, 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.

Ability descriptions by source level. Purchased caps and bonus levels are separate.

Source levelEffect
1Gains 1 point(s) of "Slashed Dream." Inflicts 1 stack(s) of "Crimson Knot" on one designated enemy target, 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.
2Gains 1 point(s) of "Slashed Dream." Inflicts 1 stack(s) of "Crimson Knot" on one designated enemy target, dealing Lightning DMG equal to 88% of Acheron's ATK to this target, as well as Lightning DMG equal to 33% of Acheron's ATK to adjacent targets.
3Gains 1 point(s) of "Slashed Dream." Inflicts 1 stack(s) of "Crimson Knot" on one designated enemy target, dealing Lightning DMG equal to 96% of Acheron's ATK to this target, as well as Lightning DMG equal to 36% of Acheron's ATK to adjacent targets.
4Gains 1 point(s) of "Slashed Dream." Inflicts 1 stack(s) of "Crimson Knot" on one designated enemy target, dealing Lightning DMG equal to 104% of Acheron's ATK to this target, as well as Lightning DMG equal to 39% of Acheron's ATK to adjacent targets.
5Gains 1 point(s) of "Slashed Dream." Inflicts 1 stack(s) of "Crimson Knot" on one designated enemy target, dealing Lightning DMG equal to 112% of Acheron's ATK to this target, as well as Lightning DMG equal to 42% of Acheron's ATK to adjacent targets.
6Gains 1 point(s) of "Slashed Dream." Inflicts 1 stack(s) of "Crimson Knot" on one designated enemy target, dealing Lightning DMG equal to 120% of Acheron's ATK to this target, as well as Lightning DMG equal to 45% of Acheron's ATK to adjacent targets.
7Gains 1 point(s) of "Slashed Dream." Inflicts 1 stack(s) of "Crimson Knot" on one designated enemy target, dealing Lightning DMG equal to 130% of Acheron's ATK to this target, as well as Lightning DMG equal to 48.75% of Acheron's ATK to adjacent targets.
8Gains 1 point(s) of "Slashed Dream." Inflicts 1 stack(s) of "Crimson Knot" on one designated enemy target, dealing Lightning DMG equal to 140% of Acheron's ATK to this target, as well as Lightning DMG equal to 52.5% of Acheron's ATK to adjacent targets.
9Gains 1 point(s) of "Slashed Dream." Inflicts 1 stack(s) of "Crimson Knot" on one designated enemy target, dealing Lightning DMG equal to 150% of Acheron's ATK to this target, as well as Lightning DMG equal to 56.25% of Acheron's ATK to adjacent targets.
10Gains 1 point(s) of "Slashed Dream." Inflicts 1 stack(s) of "Crimson Knot" on one designated enemy target, dealing Lightning DMG equal to 160% of Acheron's ATK to this target, as well as Lightning DMG equal to 60% of Acheron's ATK to adjacent targets.
11Gains 1 point(s) of "Slashed Dream." Inflicts 1 stack(s) of "Crimson Knot" on one designated enemy target, dealing Lightning DMG equal to 168% of Acheron's ATK to this target, as well as Lightning DMG equal to 63% of Acheron's ATK to adjacent targets.
12Gains 1 point(s) of "Slashed Dream." Inflicts 1 stack(s) of "Crimson Knot" on one designated enemy target, dealing Lightning DMG equal to 176% of Acheron's ATK to this target, as well as Lightning DMG equal to 66% of Acheron's ATK to adjacent targets.
13Gains 1 point(s) of "Slashed Dream." Inflicts 1 stack(s) of "Crimson Knot" on one designated enemy target, dealing Lightning DMG equal to 184% of Acheron's ATK to this target, as well as Lightning DMG equal to 69% of Acheron's ATK to adjacent targets.
14Gains 1 point(s) of "Slashed Dream." Inflicts 1 stack(s) of "Crimson Knot" on one designated enemy target, dealing Lightning DMG equal to 192% of Acheron's ATK to this target, as well as Lightning DMG equal to 72% of Acheron's ATK to adjacent targets.
15Gains 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.
Slashed Dream Cries in Red · Ultimate

Sequentially unleash "Rainblade" 3 times and "Stygian Resurge" 1 time, dealing Lightning DMG up to 223.2% of Acheron's ATK to one designated enemy target, 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 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 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.

Ability descriptions by source level. Purchased caps and bonus levels are separate.

Source levelEffect
1Sequentially unleash "Rainblade" 3 times and "Stygian Resurge" 1 time, dealing Lightning DMG up to 223.2% of Acheron's ATK to one designated enemy target, 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 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 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.
2Sequentially unleash "Rainblade" 3 times and "Stygian Resurge" 1 time, dealing Lightning DMG up to 238.08% of Acheron's ATK to one designated enemy target, as well as Lightning DMG up to 192% of Acheron's ATK to other targets. "Rainblade": Deals Lightning DMG equal to 15.36% 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 9.6% 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 38.4%. "Stygian Resurge": Deals Lightning DMG equal to 76.8% of Acheron's ATK to all enemies and remove all "Crimson Knots." "Crimson Knot" cannot be applied to enemies during the Ultimate.
3Sequentially unleash "Rainblade" 3 times and "Stygian Resurge" 1 time, dealing Lightning DMG up to 252.96% of Acheron's ATK to one designated enemy target, as well as Lightning DMG up to 204% of Acheron's ATK to other targets. "Rainblade": Deals Lightning DMG equal to 16.32% 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 10.2% 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 40.8%. "Stygian Resurge": Deals Lightning DMG equal to 81.6% of Acheron's ATK to all enemies and remove all "Crimson Knots." "Crimson Knot" cannot be applied to enemies during the Ultimate.
4Sequentially unleash "Rainblade" 3 times and "Stygian Resurge" 1 time, dealing Lightning DMG up to 267.84% of Acheron's ATK to one designated enemy target, as well as Lightning DMG up to 216% of Acheron's ATK to other targets. "Rainblade": Deals Lightning DMG equal to 17.28% 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 10.8% 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 43.2%. "Stygian Resurge": Deals Lightning DMG equal to 86.4% of Acheron's ATK to all enemies and remove all "Crimson Knots." "Crimson Knot" cannot be applied to enemies during the Ultimate.
5Sequentially unleash "Rainblade" 3 times and "Stygian Resurge" 1 time, dealing Lightning DMG up to 282.72% of Acheron's ATK to one designated enemy target, as well as Lightning DMG up to 228% of Acheron's ATK to other targets. "Rainblade": Deals Lightning DMG equal to 18.24% 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 11.4% 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 45.6%. "Stygian Resurge": Deals Lightning DMG equal to 91.2% of Acheron's ATK to all enemies and remove all "Crimson Knots." "Crimson Knot" cannot be applied to enemies during the Ultimate.
6Sequentially unleash "Rainblade" 3 times and "Stygian Resurge" 1 time, dealing Lightning DMG up to 297.6% of Acheron's ATK to one designated enemy target, as well as Lightning DMG up to 240% of Acheron's ATK to other targets. "Rainblade": Deals Lightning DMG equal to 19.2% 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 12% 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 48%. "Stygian Resurge": Deals Lightning DMG equal to 96% of Acheron's ATK to all enemies and remove all "Crimson Knots." "Crimson Knot" cannot be applied to enemies during the Ultimate.
7Sequentially unleash "Rainblade" 3 times and "Stygian Resurge" 1 time, dealing Lightning DMG up to 316.2% of Acheron's ATK to one designated enemy target, as well as Lightning DMG up to 255% of Acheron's ATK to other targets. "Rainblade": Deals Lightning DMG equal to 20.4% 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 12.75% 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 51%. "Stygian Resurge": Deals Lightning DMG equal to 102% of Acheron's ATK to all enemies and remove all "Crimson Knots." "Crimson Knot" cannot be applied to enemies during the Ultimate.
8Sequentially unleash "Rainblade" 3 times and "Stygian Resurge" 1 time, dealing Lightning DMG up to 334.8% of Acheron's ATK to one designated enemy target, as well as Lightning DMG up to 270% of Acheron's ATK to other targets. "Rainblade": Deals Lightning DMG equal to 21.6% 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 13.5% 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 54%. "Stygian Resurge": Deals Lightning DMG equal to 108% of Acheron's ATK to all enemies and remove all "Crimson Knots." "Crimson Knot" cannot be applied to enemies during the Ultimate.
9Sequentially unleash "Rainblade" 3 times and "Stygian Resurge" 1 time, dealing Lightning DMG up to 353.4% of Acheron's ATK to one designated enemy target, as well as Lightning DMG up to 285% of Acheron's ATK to other targets. "Rainblade": Deals Lightning DMG equal to 22.8% 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 14.25% 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 57%. "Stygian Resurge": Deals Lightning DMG equal to 114% of Acheron's ATK to all enemies and remove all "Crimson Knots." "Crimson Knot" cannot be applied to enemies during the Ultimate.
10Sequentially unleash "Rainblade" 3 times and "Stygian Resurge" 1 time, dealing Lightning DMG up to 372% of Acheron's ATK to one designated enemy target, as well as Lightning DMG up to 300% of Acheron's ATK to other targets. "Rainblade": Deals Lightning DMG equal to 24% 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 15% 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 60%. "Stygian Resurge": Deals Lightning DMG equal to 120% of Acheron's ATK to all enemies and remove all "Crimson Knots." "Crimson Knot" cannot be applied to enemies during the Ultimate.
11Sequentially unleash "Rainblade" 3 times and "Stygian Resurge" 1 time, dealing Lightning DMG up to 386.88% of Acheron's ATK to one designated enemy target, as well as Lightning DMG up to 312% of Acheron's ATK to other targets. "Rainblade": Deals Lightning DMG equal to 24.96% 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 15.6% 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 62.4%. "Stygian Resurge": Deals Lightning DMG equal to 124.8% of Acheron's ATK to all enemies and remove all "Crimson Knots." "Crimson Knot" cannot be applied to enemies during the Ultimate.
12Sequentially unleash "Rainblade" 3 times and "Stygian Resurge" 1 time, dealing Lightning DMG up to 401.76% of Acheron's ATK to one designated enemy target, as well as Lightning DMG up to 324% of Acheron's ATK to other targets. "Rainblade": Deals Lightning DMG equal to 25.92% 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 16.2% 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 64.8%. "Stygian Resurge": Deals Lightning DMG equal to 129.6% of Acheron's ATK to all enemies and remove all "Crimson Knots." "Crimson Knot" cannot be applied to enemies during the Ultimate.
13Sequentially unleash "Rainblade" 3 times and "Stygian Resurge" 1 time, dealing Lightning DMG up to 416.64% of Acheron's ATK to one designated enemy target, as well as Lightning DMG up to 336% of Acheron's ATK to other targets. "Rainblade": Deals Lightning DMG equal to 26.88% 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 16.8% 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 67.2%. "Stygian Resurge": Deals Lightning DMG equal to 134.4% of Acheron's ATK to all enemies and remove all "Crimson Knots." "Crimson Knot" cannot be applied to enemies during the Ultimate.
14Sequentially unleash "Rainblade" 3 times and "Stygian Resurge" 1 time, dealing Lightning DMG up to 431.52% of Acheron's ATK to one designated enemy target, as well as Lightning DMG up to 348% of Acheron's ATK to other targets. "Rainblade": Deals Lightning DMG equal to 27.84% 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 17.4% 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 69.6%. "Stygian Resurge": Deals Lightning DMG equal to 139.2% of Acheron's ATK to all enemies and remove all "Crimson Knots." "Crimson Knot" cannot be applied to enemies during the Ultimate.
15Sequentially unleash "Rainblade" 3 times and "Stygian Resurge" 1 time, dealing Lightning DMG up to 446.4% 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% 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%. "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.
Atop Rainleaf Hangs Oneness · Talent

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 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.

Ability descriptions by source level. Purchased caps and bonus levels are separate.

Source levelEffect
1When 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 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.
2When 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 11%, 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.
3When 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 12%, 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.
4When 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 13%, 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.
5When 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 14%, 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.
6When 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 15%, 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.
7When 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 16.25%, 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.
8When 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 17.5%, 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.
9When 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 18.75%, 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.
10When 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 20%, 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.
11When 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 21%, 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.
12When 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 22%, 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.
13When 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 23%, 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.
14When 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 24%, 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.
15When 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.
Attack

Attacks an enemy, and after entering combat, reduces their Toughness of the corresponding Type.

Quadrivalent Ascendance · Technique

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.

Ability descriptions by source level. Purchased caps and bonus levels are separate.

Source levelEffect
1Immediately 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.
Rainblade · Ultimate

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.

Ability descriptions by source level. Purchased caps and bonus levels are separate.

Source levelEffect
1Deals 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.
2Deals 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.
3Deals 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.
4Deals 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.
5Deals 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.
6Deals 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.
7Deals 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.
8Deals 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.
9Deals 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.
10Deals 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.
11Deals 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.
12Deals 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.
13Deals 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.
14Deals 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.
15Deals 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.
Stygian Resurge · Ultimate

Deals Lightning DMG to all enemies and removes all Crimson Knots.

Ability descriptions by source level. Purchased caps and bonus levels are separate.

Source levelEffect
1Deals Lightning DMG to all enemies and removes all Crimson Knots.
2Deals Lightning DMG to all enemies and removes all Crimson Knots.
3Deals Lightning DMG to all enemies and removes all Crimson Knots.
4Deals Lightning DMG to all enemies and removes all Crimson Knots.
5Deals Lightning DMG to all enemies and removes all Crimson Knots.
6Deals Lightning DMG to all enemies and removes all Crimson Knots.
7Deals Lightning DMG to all enemies and removes all Crimson Knots.
8Deals Lightning DMG to all enemies and removes all Crimson Knots.
9Deals Lightning DMG to all enemies and removes all Crimson Knots.
10Deals Lightning DMG to all enemies and removes all Crimson Knots.
11Deals Lightning DMG to all enemies and removes all Crimson Knots.
12Deals Lightning DMG to all enemies and removes all Crimson Knots.
13Deals Lightning DMG to all enemies and removes all Crimson Knots.
14Deals Lightning DMG to all enemies and removes all Crimson Knots.
15Deals Lightning DMG to all enemies and removes all Crimson Knots.

References and version

Game data version: 4.6.0

Acheron — Honkai: Star Rail Wiki ↗hsr-build.com ↗honkai-star-rail.fandom.com ↗
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