Firefly Guide and Best Builds

Introductions

Firefly is a 5★ Fire Character following the Path of Destruction. Firefly is a Break Main DPS that will set all of her enemies alight.
Our Firefly Build Guide will show you the best Lightcones, Relics and Team Compositions build the best Firefly you can.

Firefly's Best Light Cone

Whereabouts Should Dreams Rest
S1

Increases the wearer's Break Effect by 60.0 / 70.0 / 80.0 / 90.0 / 100%. When the wearer deals Break DMG to an enemy target, inflicts Routed on the enemy, lasting for 2 turn(s). Targets afflicted with Routed receive 24.0 / 28.0 / 32.0 / 36.0 / 40.0% increased Break DMG from the wearer, and their SPD is lowered by 20.0%. Effects of the same type cannot be stacked.

Sources: Event Warp (limited)

This is Firefly's Signature Lightcone. This Lightcone provides a massive increase to Break Effect and applies a Debuff to enemies that increases the Break DMG received from Firefly. Additionally, it will decrease the enemies SPD making them recover from Weakness Break slower which increases DPS.

Indelible Promise
S5

Increases the wearer's Break Effect by 28.0 / 35.0 / 42.0 / 49.0 / 56.0%. When the wearer uses their Ultimate, increases CRIT Rate by 15.0 / 18.8 / 22.5 / 26.3 / 30.0%, lasting for 2 turn(s).

Sources: Stellar Warp

This is a 4★ Limited Lightcone. This Lightcone Provides a large boost to Break Effect which is Firefly's main scaling stat. The CRIT Rate on this Lightcone is not significant for DPS output. This is only slightly stronger than with the main benefit being that it does not need multiple attacks to ramp the buff.

On the Fall of an Aeon
S5

When the wearer attacks, increases their ATK by 8.0 / 10.0 / 12.0 / 14.0 / 16.0% in this battle. This effect can stack up to 4 time(s). After the wearer breaks an enemy's Weakness, increases DMG dealt by 12.0 / 15.0 / 18.0 / 21.0 / 24.0%, lasting for 2 turn(s).

Sources: Herta's Store

This is the 5★ Destruction Herta's Store Lightcone which makes it easily accessible. This Lightcone provides a very large stacking ATK% bonus after each attack (up to 4 stacks). Firefly's A2 Trace Module γ: Core Overload will convert this ATK into a large amount of Break. The DMG dealt bonus gained from breaking an enemy will not have a significant effect on Firefly's damage as most of her damage comes from Break which is not affected by this stat.

Indelible Promise
S1

Best Relics and Planar Ornaments for Firefly

Best Relics for Firefly

These are the best Relic Sets to build for Firefly.

Iron Cavalry Against the Scourge

2-Piece Set: Increases Break Effect by 16.0%.

4-Piece Set: If the wearer's Break Effect is 150.0% or higher, the Break DMG dealt to the enemy target ignores 10.0% of their DEF. If the wearer's Break Effect is 250.0% or higher, the Super Break DMG dealt to the enemy target additionally ignores 15.0% of their DEF.

This is Firefly's best 4pc by far as it provides a lot of DEF Ignore for Break DMG which is the majority of Firefly's damage output.

Thief of Shooting Meteor

2-Piece Set: Increases Break Effect by 16.0%.

4-Piece Set: Increases the wearer's Break Effect by 16.0%. After the wearer inflicts Weakness Break on an enemy, regenerates 3 Energy.

Another viable option for Firefly but we do not recommend it as Iron Cavalry is significantly more powerful due to having DEF Ignore. The Energy Generated from this Relic Set is not significant enough to be noticeable due to Firefly's incredibly high 240 Energy Cost.

Best Planar Ornaments

Forge of the Kalpagni Lantern

2-Piece Set: Increases the wearer's SPD by 6.0%. When the wearer hits an enemy target that has Fire Weakness, the wearer's Break Effect increases by 40.0%, lasting for 1 turn(s).

This is Firefly's best Planar Ornament to build as it provides a permanent 40% Break Effect buff and a 6% SPD increase. The Break Effect is provided whenever you hit an enemy with Fire Weakness and Firefly can implant Fire Weakness with her Enhanced Skill Fyrefly Type-IV: Deathstar Overload.

Firefly's Stat Priority

Body

ATK%

Feet

SPD

Planar Sphere

ATK%

Link Rope

Break Effect

Stat Priority

SPD

Break Effect

ATK%

Recommended Endgame Stats for Firefly

3000+

ATK

2500+

SPD

154+ sheet SPD, Ideally 210+ in combat during Ultimate

Break Effect

210%+

Traces Priority

Skills Priority

Ultimate > Skill > Talent > Basic ATK

Major Traces Priority

Module β: Autoreactive Armor > Module γ: Core Overload > Module α: Antilag Outburst

Firefly Build Comments

Character Explanation Build Advice

Character Explanation

Firefly is a Superbreak DPS focused around dealing damage during her Ultimate Fyrefly Type-IV: Complete Combustion. Firefly's Ultimate lasts for a fixed SPD, grants Firefly a large boost in SPD (60 at Lv10), increases Weakness Break Efficiency, transforms her abilities into stronger versions and increases Break DMG dealt.

Firefly's Ultimate Fyrefly Type-IV: Complete Combustion lasts for 70 SPD which means you want to have multiples of 70 SPD on Firefly, after buffs, in order to get the most actions within her Ultimate's duration. For example at 210 SPD on Firefly she will get to attack 4 times within Ultimate (Once immediately after Ultimate, then at +47.62 AV, +95.24 AV, and 142.86 AV).

Firefly has a very high Ultimate Energy cost of 240 and her Enhanced Abilities do not Regenerate Energy. For Firefly to build her Ultimate quickly She must use her normal Skill Order: Aerial Bombardment which generates a fixed amount of Energy up to 60% Energy (At lv10) — effectively this skill generates 72 Energy, which is significantly more than a Basic Attack generating 20. This means it is incredibly important for Firefly to have skill points available on her turn or she will experience a significant downtime in her DPS output.

Firefly's Enhanced Skill Fyrefly Type-IV: Deathstar Overload can apply Fire Weakness to the main target she hits allowing her to always reduce enemy toughness effectively. Additionally, the skill gets upgraded to a Blast skill and has higher Toughness Damage than the base Skill. Her Enhanced Skill will also Heal Firefly which mitigates the self damage inflicted by her baseline skill Order: Aerial Bombardment.

Firefly's Enhanced Basic ATK Fyrefly Type-IV: Pyrogenic Decimation will heal Firefly similar to her Enhanced Skill and has slightly higher Toughness Damage. You would ideally not have to use this as it does significantly less Toughness Damage than her Skill.

Firefly's Technique Δ Order: Meteoric Incineration is very important to use on fights that are not Fire Weak as it will AOE apply Fire Weakness at the start of each Wave. This lets you do full damage immediately without having to apply Fire Weakness with her Enhanced Skill.

Firefly's A2 Trace Module γ: Core Overload is a powerful trace that converts ATK into Break Effect allowing her to scale damage with ATK on gear. This is less effective than getting a Break Effect roll but makes her easier to gear.

Firefly's A4 Trace Module β: Autoreactive Armor provides important Break Effect breakpoints of 200% and 360% to reach as it grants her inherent Super Break DMG without it being granted by a support. This bonus is dynamic and does not require you to build that much Break purely on Firefly and Break Effect buffs granted by support characters can help you reach the Breakpoints.

Firefly's A6 Trace Module α: Antilag Outburst allows Firefly to still reduce the Toughness of enemies without Fire Weakness at 55% effect while she is in the Complete Combustion state. This helps Firefly still be effective on cleave encounters where smaller enemies spawn without Fire Weakness.

Build Advice

The most important thing for building Firefly is targeting Speed Breakpoints for her Ultimate. The easiest SPD breakpoint to reach is the 210 SPD breakpoint in ultimate which needs 150 SPD on your character sheet in order to achieve as her Ultimate will provide the final 60 SPD to reach 210 SPD (at Lv10 Ultimate.)

As Firefly does not start in her Ultimate we suggest exceeding the theoretical 150 SPD required for her Ultimate action breakpoint so that she can get an additional action within a fight. For example, 154 SPD will give an additional Attack in 300 AV, 156 SPD will give an additional Attack in 250 AV, 165 SPD will give an additional Attack in 150 AV.

The next most important thing to do on Firefly is maximise her Break Effect as the majority of her damage comes from Break and her A4 Trace Module β: Autoreactive Armor has breakpoints at 200%/360% Break Effect. You will not be able to get to 360% Break Effect purely with Firefly's own gear but her best Supporting Characters provide significant Break Effect buffs which make getting there easy.

Firefly's A2 Trace Module γ: Core Overload will grant 0.8% Break Effect for every 10 points of ATK over 1800. This makes an ATK% roll on gear half as effective as a Break Roll for DPS.

Firefly's Best Eidolons

Firefly's first Eidolon In Reddened Chrysalis, I Once Rest is very powerful because it negates the Skill Point cost of her Enhanced Skill. This lets you use more Skills on the Supporting Characters on your team making their Ultimates easier to maintain as well as allowing them to contribute more Break Damage. Furthermore, Firefly's Enhanced Skill does almost all of her damage the 15% DEF Ignore is very good despite being limited. When combined this is excellent for overall Team DPS.

Firefly's E2 From Shattered Sky, I Free Fall is a big improvement to DPS especially when paired with Fugue that allows you to break enemies twice. This Eidolon will grant a significant number of Extra Turns resulting in a large DPS gain. This is an efficient stopping point for investment and we do nor recommend going further unless you specifically wanted E6 as all of the eidolons up to that do not provide very much DPS at all.

Firefly's E3 Amidst Silenced Stars, I Deep Sleep has very little effect on her overall DPS output as most of her DPS comes from Superbreak which is not affected by this Eidolon.

Firefly's E4 Upon Lighted Fyrefly, I Soon Gaze does not provide any DPS stats but the Effect RES can be useful to prevent Crowd Control. With the bonus from this Eidolon added to the Effect RES provided by her Talent she almost is immune to Crowd Control. This is not worth targeting and instead can be thought of as part of the complete E6 Package.

Firefly's E5 From Undreamt Night, I Thence Shine is quite weak. It provides a small increase in damage via the Ultimate Levels. The higher Level ultimate provides an Extra 6 SPD and 2% increased Break DMG taken on enemies while Firefly is in the Complete Combustion state from her Ultimate. This Eidolon is worth ~1-3% DPS depending on whether the SPD lets you reach an Action breakpoint for a fight.

Firefly's E6 In Finalized Morrow, I Full Bloom is an extremely powerful Eidolon varying between 50% and 60% increased DPS done. Despite this Eidolons power it does not make up for the incredibly weak E3 through E6 and you would be better off investing in Support Eidolons such as Fugue or The Dahlia.

Firefly's Best Teams

To learn all about Firefly's synergies and best team compositions, check our dedicated Firefly's team page below:

Firefly Teams

Saeldur

Staff Author

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This guide was written by Saeldur, expert Honkai: Star Rail theorycrafter and guide writer for Icy Veins. Saeldur is a high-end HSR player with a deep understanding of the various characters while also clearing PF, MoC and AS when each cycle releases.