What is the best Light Cone for Firefly?

The Unreachable Side is the closest fit on the data: it is a 5-star Destruction Light Cone with 582 base ATK at level 80, and its passive acts on HP. Ninja Record: Sound Hunt is the best 4-star alternative.

Which relic set should Firefly use?

Divine-Querying Master Smith. Its 2-piece bonus is: Increases Max HP by 12%. Its 4-piece bonus is: Increases the wearer's CRIT DMG dealt to enemy targets in the DEF reduction state by 28%. After the wearer inflicts the DEF reduction state on an enemy target, all allies gain "Comburent" for 2 turn(s). This effect cannot be stacked. The DMG dealt by ally targets with "Comburent" increases by 15%. This effect can be triggered again after the wearer uses an attack.

Which Planar Ornament should Firefly use?

Fleet of the Ageless. Its 2-piece bonus is: Increases the wearer's Max HP by 12%. When the wearer's SPD reaches 120 or higher, all allies' ATK increases by 8%. Planar Ornaments have no 4-piece bonus; the sphere and the rope are the whole set.

Firefly, Fire Destruction character | Honkai: Star Rail

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Stellaron Hunters

Firefly Build

Build guide · Honkai: Star Rail

FireDestructionMain DPS

English voice: Analesa Fisher & Adin Rudd

The best Firefly build in Honkai: Star Rail (Version 4.6) is Whereabouts Should Dreams Rest with Iron Cavalry Against the Scourge. Updated November 5, 2026

Abilities Traces Materials Eidolons

Where these rankings come fromThe light cone order, relic sets and stat priorities on this tab are prydwen.gg’s, measured in play and rephrased. Relative damage figures are ratios against the bottom of each ranking, not absolute numbers, and each one holds only for the superimposition and team its row states. Everything else (base stats, passive text, material totals) is read from the game’s own data.

Light cones

4 ranked

Whereabouts Should Dreams Rest, 5★ Destruction Light Cone | Honkai: Star Rail

BISWhereabouts Should Dreams Rest

117.76% at S1

476

Base ATK · lv 80

1164 HP529 DEF

Thus Burns the Dawn, 5★ Destruction Light Cone | Honkai: Star Rail

#2Thus Burns the Dawn

115.57% at S1

688

Base ATK · lv 80

953 HP397 DEF

On the Fall of an Aeon, 5★ Destruction Light Cone | Honkai: Star Rail

#3On the Fall of an Aeon

100% at S5

529

Base ATK · lv 80

1058 HP397 DEF

Indelible Promise, 4★ Destruction Light Cone | Honkai: Star Rail

#4Indelible Promise

98.14% at S5

476

Base ATK · lv 80

953 HP331 DEF

Relics

2 sets

CoreIron Cavalry Against the Scourge

Best and most consistent set for Firefly by a significant margin, granting her BREAK EFFECT% but more importantly DEF SHRED for her Break and Super Breaks. As a break-focused character, stats that boost that damage are rare making DEF SHRED absurdly valuable for her.

2PCIncreases Break Effect by 16%.

4PCIf the wearer's Break Effect is 150% or higher, the Break DMG dealt to the enemy target ignores 10% of their DEF. If the wearer's Break Effect is 250% or higher, the Super Break DMG dealt to the enemy target additionally ignores 15% of their DEF.

Also works

Thief of Shooting Meteor

Planar ornaments

Sphere and rope · 2-piece only

CoreForge of the Kalpagni Lantern

Best Planar set for Firefly, offering her some much-appreciated Speed so she can reach the desired Speed breakpoint easier and tremendous amount of Break Effect on top of that.

2PCIncreases the wearer's SPD by 6%. When the wearer hits an enemy target that has Fire Weakness, the wearer's Break Effect increases by 40%, lasting for 1 turn(s).

Also works

Talia: Kingdom of Banditry

Main stats

Ultimate · 240 energy

Body: ATK%
Feet: Speed
Planar Sphere: ATK%
Link Rope: Break Effect

Substat priority

Highest first

1SPD (Until Breakpoint)Best
2Break Effect%
3ATK%

Stack Speed until you have enough to achieve Firefly's 210 Speed goal (or higher if you're aiming for 0 cycles) while fully buffed in combat, then stack Break Effect wherever possible while picking up any ATK% you can here and there for additional benefits.

Trace priority

Level in this order

#1
Ultimate
Max first
#2
Skill = Talent
Then
#3
Basic
Next

Major traces, best first: Module α: Antilag Outburst (A2) > Module β: Autoreactive Armor (A4) > Module γ: Core Overload (A6)

Best Eidolons

E3 and E5 raise levels only

E1In Reddened Chrysalis, I Once Rest
E2From Shattered Sky, I Free Fall
E3Level bump
E4Upon Lighted Fyrefly, I Soon Gaze
E5Level bump
E6In Finalized Morrow, I Full Bloom

E1
In Reddened Chrysalis, I Once Rest
Game text
When using the Enhanced Skill, ignores 15% of the target's DEF. The Enhanced Skill does not consume Skill Points.
E2
From Shattered Sky, I Free Fall
Game text
While in Complete Combustion, using the Enhanced Basic ATK or the Enhanced Skill to defeat an enemy target or to Break their Weakness allows SAM to immediately gain 1 extra turn. This effect can only trigger 1 time per turn, and the trigger count resets at the start of SAM's turn.
E4
Upon Lighted Fyrefly, I Soon Gaze
Game text
While in Complete Combustion, increases SAM's Effect RES by 50%.
E6
In Finalized Morrow, I Full Bloom
Game text
While in Complete Combustion, increases SAM's Fire RES PEN by 20%. When using the Enhanced Basic ATK or Enhanced Skill, increases Weakness Break Efficiency by 50%.

Teams

1 team

Firefly team

Fire · BreakLeads

A Break Effect carry with two Harmony units that raise Break damage and Weakness Break efficiency, and a sustain that keeps Break uptime rather than adding damage.

Firefly, this characterMain DPS
Ruan MeiBreak amplifier
FugueWeakness implant
LingshaSustain · Break

All teams, with every replacement

Honkai: Star Rail 5★ Fire Destruction Main DPS

Firefly build summary

Updated November 5, 2026

Whereabouts Should Dreams Rest tops the light cone ranking for Firefly, at 117.76% relative damage at S1, ahead of Thus Burns the Dawn, On the Fall of an Aeon and Indelible Promise. That order is prydwen.gg's, measured in play and rephrased here; every row of it sits under Light cones below.

Run Iron Cavalry Against the Scourge on Firefly, with Thief of Shooting Meteor behind it. The planar ornament is Forge of the Kalpagni Lantern. Main stats are ATK% body, Speed feet, ATK% sphere, Break Effect rope. Roll substats in the order SPD (Until Breakpoint) > Break Effect% > ATK%.

Trace priority is Ultimate > Skill = Talent > Basic. The Ultimate costs 240 energy, which is what an Energy Regeneration Rate target has to clear.

The strongest team is Firefly, Ruan Mei, Fugue and Lingsha, built around Firefly: Fire · Break.

Role: Main DPS / Support / Sustain
Best light cone: Whereabouts Should Dreams Rest
Alternatives: Thus Burns the Dawn, On the Fall of an Aeon, Indelible Promise
Relic set: Iron Cavalry Against the Scourge
Planar ornament: Forge of the Kalpagni Lantern
Main stats: ATK% body, Speed feet, ATK% sphere, Break Effect rope
Substat priority: SPD (Until Breakpoint) > Break Effect% > ATK%
Trace priority: Ultimate > Skill = Talent > Basic
Best team: Firefly, Ruan Mei, Fugue, Lingsha
Ultimate energy cost: 240 energy
Key ascension material: 65× Raging Heart
Last updated: November 5, 2026

Firefly build FAQ

What is the best Light Cone for Firefly?: The Unreachable Side is the closest fit on the data: it is a 5-star Destruction Light Cone with 582 base ATK at level 80, and its passive acts on HP. Ninja Record: Sound Hunt is the best 4-star alternative.
Which relic set should Firefly use?: Divine-Querying Master Smith. Its 2-piece bonus is: Increases Max HP by 12%. Its 4-piece bonus is: Increases the wearer's CRIT DMG dealt to enemy targets in the DEF reduction state by 28%. After the wearer inflicts the DEF reduction state on an enemy target, all allies gain "Comburent" for 2 turn(s). This effect cannot be stacked. The DMG dealt by ally targets with "Comburent" increases by 15%. This effect can be triggered again after the wearer uses an attack.
Which Planar Ornament should Firefly use?: Fleet of the Ageless. Its 2-piece bonus is: Increases the wearer's Max HP by 12%. When the wearer's SPD reaches 120 or higher, all allies' ATK increases by 8%. Planar Ornaments have no 4-piece bonus; the sphere and the rope are the whole set.

Firefly Build

Light cones

Relics

Planar ornaments

Main stats

Substat priority

Trace priority

Best Eidolons

In Reddened Chrysalis, I Once Rest

From Shattered Sky, I Free Fall

Upon Lighted Fyrefly, I Soon Gaze

In Finalized Morrow, I Full Bloom

Teams

Firefly build FAQ