Phainon is a playable Destruction character in Honkai: Star Rail. He mostly depends on ATK and Crit value to achieve his high DPS. Here are the best Light Cones for Phainon in HSR.

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Under the Blue Sky

Base Stats

952 Base HP

476 Base ATK

330 Base DEF

S5 Effect

Increases the wearer’s ATK by 32%. When the wearer defeats an enemy, the wearer’s CRIT Rate increases by 24% for 3 turn(s).

Under the Blue Sky grants Phainon around 32% ATK without any requirement, but after taking an enemy down, the Light Cone will increase Phainon’s Crit Rate by up to 24% based on its Superimposition level. It’s a very useful 4-star Light Cone for Phainon since it actively increases his ATK and Crit Rate, which will make it easier for players to build Phainon’s Crit DMG.
Brighter Than the Sun

Base Stats

1058 Base HP

635 Base ATK

396 Base DEF

Effect

Increases the wearer’s CRIT Rate by 18%. When the wearer uses their Basic ATK, they will gain 1 stack of Dragon’s Call, lasting for 2 turns. Each Stack of Dragon’s Call increases the wearer’s ATK by 18% and Energy Regeneration Rate by 6.0%. Dragon’s Call can be stacked up to 2 times.

Brighter Than the Sun is Imbibitor Lunae’s best Light Cone in HSR. It’s a 5-star Light Cone that will decently increase Phainon’s Crit Rate and ATK% during combat. But that’s not the only reason why it’s a good Light Cone for Phainon. Brighter Than the Sun also provides Phainon with a high Base ATK, which is very good for his kit.
A Trail of Bygone Blood

Base Stats

1058 Base HP

529 Base ATK

331 Base DEF

S1/S5 Effect

Increases the wearer’s CRIT Rate by 12%/20%. The Skill DMG and Ultimate DMG dealt by the wearer increases by 24%/40%.

Entering the serious contenders for the best Light Cones for Phainon in Honkai: Star Rail, A Trail of Bygone Blood is an amazing choice for a 4-star Light Cone. It increases his Crit Rate and Skill DMG, which is what he’ll mostly deal during his Ultimate form.

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The Light Cone even has a sufficient Base ATK that can match 5-star HSR options. On S5, A Trail of Bygone Blood performs slightly better than On the Fall of an Aeon. Unfortunately, this Phainon weapon is only obtainable from the Battle Pass, making it not F2P-friendly.
On the Fall of an Aeon

Base Stats

1058 Base HP

529 Base ATK

396 Base DEF

S5 Effect

When the wearer attacks, increases their ATK by 16% in this battle. This effect can stack up to 4 time(s). After the wearer breaks an enemy’s Weakness, increases DMG dealt by 24%, lasting for 2 turn(s).

On the Fall of an Aeon is Phainon’s second-best Light Cone in HSR. It’s an F2P Light Cone where players can upgrade it to S5 easily, which is the best part. It has an acceptable Base ATK alongside a passive effect that keeps increasing Phainon’s ATK. Not only that, but when Phainon breaks an enemy weakness, he’ll get an extra DMG buff. This will help Phainon even when he’s in his Ultimate form.
Thus Burns the Dawn

Base Stats

953 Base HP

688 Base ATK

397 Base DEF

Effect

The wearer’s base SPD increases by 12. When the wearer deals DMG, ignores 18% of the target’s DEF. After the wearer uses Ultimate, obtains “Blazing Sun,” which is removed at the start of their turn. While “Blazing Sun” is in possession, increases the wearer’s DMG dealt by 60%.

As Phainon Signature Light Cone, Thus Burns the Dawn synergizes perfectly with his kit, especially the last part of its effect, where it grants him 60% DMG when he casts his Ultimate. It will be very hard for other characters to maintain that effect for more than one action, while it takes eight actions for Phainon to lose that effect, before he gains it again when he casts his Ultimate one more time.

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Additionally, the limited 5-star Light Cone has one of the highest Base ATK in HSR. It also buffs Phainon’s Base SPD to significantly improve his performance during his Ultimate form. This 12 Base SPD turns Phainon from a slow Destruction unit in HSR into a quick DPS. On top of all that, Phainon gets to ignore 18% of enemies’ DEF when he attacks. All in all, Thus Burns the Dawn is the best Light Cone for Phainon in Honkai: Star Rail.