Best Light Cone
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Black Swan is a character that depends on applying DoT on enemies to deal damage inHonkai: Star Rail. Her entire kit, even her Traces, works towards making the most of each and every one of her DoTs, no matter how many they are.
One important detail about building Black Swan is maximizing her A6 Trace’s effects by building her with more than 120% plusEffect Hit Rate inHonkai: Star Rail. It’s almost unavoidable to not place Effect Hit Rate on her Body Relic’s main stat unless her Light Cone can offer her enough to neglect the Effect Hit Rate and go straight to ATK%, which yields more damage for Black Swan.
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S5 Passive
Increases Break Effect dealt by the wearer by 32%, and increases their DMG to enemies afflicted with Shock or Wind Shear by 32%. This also applies to DoT.
As a last option, when no other option is available, Black Swan can somewhat benefit from Fermata.The extra Shock or Wind Shear DMG can always come in handyfor Black Swan’s utility during combat. However, it’s better not to invest in Fermata unless there aren’t any other options available for her.

Increases the wearer’s Effect Hit Rate by 40%. When the wearer attacks enemies that have reduced DEF, regenerates 8 Energy.
Since Black Swan can reduce enemies’ DEF with her Skill, she can fully utilize the Before the Tutorial Mission Starts effect. The Light Cone regenerates Black Swan’s Energy on the condition ofhitting an enemy with a reduced DEF debuff. Additionally, at S5, the 40% extra Effect Hit Rate is really important to Black Swan since her A6 Trace grants her up to 72% DMG, which scales with her Effect Hit Rate.

When the wearer hits an enemy and if the hit enemy is not already Ensnared, then there is a 100% base chance to Ensnare the hit enemy. Ensnared enemies' DEF decreases by 16% for 1 turn(s).
Decreasing enemies’ DEF is always nice to have for anyDPS unit inHonkai: Star Rail. As a Nihility who focuses on DoT DMG, Black Swan can definitely benefit from Resolution Shines As Pearls of Sweat effect. The Light Cone debuffs opponents by decreasing their DEF by up to 16% at S5.

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Increases the wearer’s Break Effect by 40%. When the wearer unleashes their Ultimate, increases DoT dealt by the wearer by 48% for 2 turns. When the target suffering from the wearer’s DoT is defeated, regenerates 6 Energy.

While Black Swan doesn’t get anything from Solitary Healing’s Break Effect stat, she can still benefit from the Light Cone’s extra DoT DMG and Energy Regeneration. Additionally, as a 5-star piece of equipment, Solitary Healing also offers Black Swanmore stats than her other 4-star options. Considering it’s a F2P weapon and can be obtained from the Simulated Universe, it’s an easy go-to for Black Swan Light Cone inHonkai: Star Rail.
For every debuff the target enemy has, the DMG dealt by the wearer increases by 24%, stacking up to 3 time(s). This effect also applies to DoT.

Since it’s easy for Black Swan to debuff enemies, without even playing at times, Good Night and Sleep Well falls into one of herbest Light Cones inHonkai: Star Rail. One of the reasons is, that at S5, the weapon grants Black Swan 24% extra damage up to 3 times, which ends up stacking to a whopping 72%.
Increases the wearer’s Effect Hit Rate by 40% and increases DoT by 48%.

The Eyes of the Prey Light Cone is what makes Black Swanvery affordable to get and build inHonkai: Star Rail. It’s an incredible weapon that notably increases Black Swan’s utility and damage. At S5, you get a massive amount of Effect Hit Rate and DoT DMG, which is crucial for her build.
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S1 Passive
Increases the wearer’s Effect Hit Rate by 40%. When the wearer deals DMG to an enemy inflicted with Wind Shear, Burn, Shock or Bleed, they will individually gain 1 stack of Prophet. This effect can stack up to 4 times. In a single battle, each type of DoT can only generate 1 stack of Prophet. Every stack of Prophet increases the wearer’s ATK by 5% and the DoT they deal will ignore 7.2% of the target’s DEF.
Reforged Remembrance massively increases Black Swan’s Effect Hit Rate by 40%, which helps players be more comfortable building her with more ATK. Not only that, but the Light Cone grants Black Swan the ability to further ignore enemies’ DEF for each stack of her Prophet stacks. As Black Swan’s best-in-slot Light Cone, Reforged Remembrance is a must-have if your goal is to maximize her utility.