Best Firefly Honkai Star Rail build: Relics, Light Cone, team comp & more

Firefly, a Fire Destruction 5-star unit in Honkai Star Rail. Here is a detailed build featuring her best Relics, Ornaments, Light Cones, and team comp.

Firefly, over the past few months, has become one of the most beloved characters in this game. Her relationship with the Trailblazer, impact on the story, and personal struggles have attracted every fan of Honkai Star Rail.

The best aspect about Firefly is that her damage potential for free-to-play players is on par with people who will spend money on her. She is one of those units who offers a lot with very little investment.

If you are interested in pulling for Firefly, here is what you need to know about her.

Who is Firefly in Honkai Star Rail?

Firefly is a Stellaron Hunter who also pilots the cyborg Sam. She has a very bright personality and is always looking to help the Trailblazer. In fact, over the course of Penacony’s story, she has become the Trailblazer’s closest friend and are always looking after one another.

However, she also has a really depressing backstory as her home planet was destroyed due to a Swarm Disaster attack. Without spoiling too much, she has since joined the Stellaron Hunters, but she also has her own ideals and beliefs that Firefly works hard to live by.

Firefly Traces in Honkai Star Rail

• Basic ATK- Order: Flare Propulsion
  • Deals Fire DMG equal to 50% of SAM’s ATK to a single target enemy.
  • Fyrefly Type-IV: Pyrogenic Decimation
    • Restores HP by an amount equal to 20% of this unit’s Max HP. Deals Fire DMG equal to 100% of SAM’s ATK to a single target enemy.
• Skill- Order: Aerial Bombardment
  • Consumes SAM’s HP equal to 40% of SAM’s Max HP and regenerates a fixed amount of Energy equal to 50% of SAM’s Max Energy. Deals Fire DMG equal to 100% of SAM’s ATK to a single target enemy. If the current HP is not sufficient, then SAM’s HP is reduced to 1 when using this Skill. Enables this unit’s next Action to be Advanced by 25%.
  • Fyrefly Type-IV: Deathstar Overload
    • Restores HP by an amount equal to 25% of this unit’s Max HP. Applies Fire Weakness to a single target enemy, lasting for 2 turn(s). Deals Fire DMG equal to (0.2 × Break Effect + 100%) of SAM’s ATK to this target. At the same time, deals Fire DMG equal to (0.1 × Break Effect + 50%) of SAM’s ATK to adjacent targets. The Break Effect taken into the calculation is capped at 360%.
• Talent- Chrysalid Pyronexus
  • The lower the HP, the less DMG received. When HP is 20% or lower, the DMG Reduction reaches its maximum effect, reducing up to 20%. During the Complete Combustion, the DMG Reduction remains at its maximum effect, and the Effect RES increases by 10%. If Energy is lower than 50% when the battle starts, regenerates Energy to 50%. Once Energy is regenerated to its maximum, dispels all debuffs on this unit.
• Ultimate- Fyrefly Type-IV: Complete Combustion
  • Upon entering the Complete Combustion state, Advances this unit’s Action by 100% and gains Enhanced Basic ATK and Enhanced Skill. While in Complete Combustion, increases SPD by 30, and when using the Enhanced Basic ATK or Enhanced Skill, increases this unit’s Weakness Break efficiency by 50% and the Break DMG received by the enemy targets by 10%, lasting until the current attack ends. A countdown timer for the Complete Combustion state appears on the Action Order. When the countdown turn starts, SAM exits the Complete Combustion state. The countdown has a fixed SPD of 70. SAM cannot use Ultimate while in Complete Combustion.

• Technique: Order: Meteoric Incineration
  • Leaps into the air and moves about freely for 5 seconds, which can be ended early by launching a plunging attack. When the duration ends, plunges and immediately attacks all enemies within a set area. At the start of each wave, applies a Fire Weakness to all enemies, lasting for 2 turn(s). Then, deals Fire DMG equal to 200% of SAM’s ATK to all enemies.
• Module Alpha: Antilag Outburst
  • During the Complete Combustion, attacking enemies that has no Fire Weakness can also reduce their Toughness, with the effect being equivalent to 55% of the original Toughness Reduction from abilities.
• Module Beta: Autoreactive Armor
  • When SAM is in Complete Combustion with a Break Effect that is equal to or greater than 200%/360%, attacking a Weakness-Broken enemy target will convert the Toughness Reduction of this attack into 1 instance of 35%/50% Super Break DMG.
• Module Gamma: Core Overload
  • For every 10 of SAM’s ATK that exceeds 1800, increases SAM’s Break Effect by 0.8%.

Firefly Eidolons in Honkai Star Rail

• Level 1- In Reddened Chrysalis, I Once Rest: When using the Enhanced Skill, ignores 15% of the target’s DEF. And the Enhanced Skill does not consume Skill Points.
• Level 2- From Shattered Sky, I Free Fall: When using the Enhanced Basic ATK or the Enhanced Skill in Complete Combustion state to defeat an enemy target or cause them to be Weakness Broken, SAM immediately gains 1 extra turn. This effect can trigger again after 1 turn(s).
• Level 3- Amidst Silenced Stars, I Deep Sleep: Skill Lv. +2, up to a maximum of Lv. 15. Basic ATK Lv. +1, up to a maximum of Lv. 10.
• Level 4- Upon Lighted Fyrefly, I Soon Gaze: While in Complete Combustion, increases SAM’s Effect RES by 50%.
• Level 5- From Undreamt Night, I Thence Shine: Ultimate Lv. +2, up to a maximum of Lv. 15. Talent Lv. +2, up to a maximum of Lv. 15.
• Level 6- In Finalized Morrow, I Full Bloom: While in Complete Combustion, increases SAM’s Fire RES PEN by 20%. When using the Enhanced Basic ATK or Enhanced Skill, increases the Weakness Break efficiency by 50%.

Best Firefly Light Cones in Honkai Star Rail

Whereabouts Should Dreams Rest

This is a 5-star Light Cone and is the best one you can use on Firefly. This Light Cone increases the Break Effect of the wearer by 60%. Upon dealing Break Damage to an enemy, the target gets marked by Routed for 2 turns.

Every target afflicted by Routed receives 24% increased Break Damage from the wearer of this Light Cone. They also have their SPD lowered by 20%. You cannot stack these effects from other sources.

This Light Cone can only be picked from the Light Cone Event Warp whenever it is available.

On the Fall of an Aeon

Upon attacking an enemy, the wearer’s ATK is increased by 8% during the battle. This effect can be stacked up to a total of 4 times. Upon inflicting Weakness Break, the wearer’s DMG is further enhanced by 12%.

While this Light Cone does not have the Break Effect stats that Firefly needs, it is still a powerful alternative. It is also readily accessible from Herta’s Store in Simulated Universe.

Indelible Promise

This is a 4-star Light Cone that increases the Break Effect of the wearer by 28%. Upon using their Ultimate, the wearer’s Crit Rate is increased by 15% and it lasts for 2 turns.

If you have this Light Cone at Superposition V, it will be a better choice than On the Fall of an Aeon at Superposition I.

The Break Effect stat is what makes Firefly strong and any Light Cone providing that is considered good.

Best Relics and Ornament set for Firefly in Honkai Star Rail

Relics

The best Relic asset for Firefly is Iron Cavalry against the Scourge. The set bonus of this Relic set is as follows:

Set	Bonus
2-pc bonus	Increases Break Effect by 16%.
4-pc bonus	If the wearer’s Break Effect is 150% or higher, ignores 10% of the enemy target’s DEF when dealing Break DMG to them. When the wearer’s Break Effect is 250% or higher, the Super Break DMG they deal to enemy targets additionally ignores 15% of the targets’ DEF.

Ornament

The best Ornament set for Firefly in Honkai Star Rail is Forge of the Kalpagni Lantern. The set bonus for this artifact set is as follows:

Set	Bonus
2-pc bonus	Increases 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).

Best stats for Firefly

Here are the stats you should focus when farming the Relics and Ornament sets for Firefly in Honkai Star Rail:

Main Stats	Substats
Body: ATK%	Break Effect
Boots: SPD	ATK%
Sphere: ATK%	SPD
Rope: Break Effect	Crit Rate and Crit DMG

You should try maintaining around 350% Break Effect during combat and over 2500 ATK. Firefly needs Crit, but it is the least of her priorities. Break Effect is the most important stat for her, as that is her main source of damage.

Firefly ascension and Trace level-up materials

Ascension materials

Firefly in Honkai Star Rail needs Tatters of Thought and its upgrades, and Raging Heart for leveling up. Here are the exact number of materials you need for Firefly:

Ascension Level	Credits	Materials		Rewards
1	4000	Tatters of Thought x5		1x Star Rail Pass
2	8000	Tatters of Thought x10
3	16000	Fragments of Impression x6	Raging Heart x3	1x Star Rail Pass
4	40000	Fragments of Impression x9	Raging Heart x7
5	80000	Shards of Desire x6	Raging Heart x20	1x Star Rail Pass
6	160000	Shards of Desire x9	Raging Heart x35

Where to farm Firefly ascension materials

Tatters of Thought and its upgrades

This item is dropped by an enemy called the Memory Zone Meme. You can locate it from the Synthesize option in the main menu. All you need to do is open Synthesize, look for the material and click on it.

This will open a menu with the name of the enemy written over it. Click on that, and the game will direct you to the concerned locations automatically. You can also farm Golden Calyx or send characters to complete assignments for Tatters of Thought.

Raging Heart

Raging Heart is a drop from the boss Stagnant Shadow: Shape of Ire. You can find it in Dewlight Pavilion in Penacony.

Trace level-up materials

Firefly’s Traces in Honkai Star Rail needs Tatters of Thought and its upgrades, Borisin Teeth and it’s upgrades, and the boss material Lost Echo of the Shared Wish. The exact number of materials you need are as follows:

• Tatters of Thought x41
• Fragments of Impression x56
• Shards of Desire x58
• Borisin Teeth x18
• Lupitoxin Sawteeth x69
• Moon Madness Fang x139
• Unknown Boss Material x12
• Tracks of Destiny x8

Where to farm Firefly Trace level-up materials

Borisin Teeth and its upgrades

This material is dropped from Crimson Calyx: Bud of Destruction. You can find it in Scalegorge Waterscape in Xianzhou Loufu.

Lost Echo of the Shared Wish

This is a drop from the Echo of War: Salutations of Ashen Dreams. You need to unlock this boss by completing Honkai Star Rail version 2.2 story quest.

Firefly Trace and Eidolon priority in Honkai Star Rail

In this section, we will discuss the Traces and Eidolons you should prioritize for Firefly in Honkai Star Rail.

Trace Priority

The Traces you must prioritize for Firefly are as follows:

• Ultimate
• Skill
• Talent

Ultimate is the main ability for Firefly as that is her primary damage output. Skill is the second most important ability for Firefly as the enhanced version of this Trace deals a lot of damage. Finally, you need Firefly’s Talent for survivability.

Eidolon priority

The Eidolons you must consider for Firefly are as follows:

• Eidolon 1
• Eidolon 2
• Eidolon 6

Among these, Eidolon 1 will ignore 15% of target’s DEF when using the Enhanced Skill. With Eidolon 2, players will gain 1 extra turn whenever Sam breaks the Weakness of an enemy using Enhanced Skill.

Finally, with Eidolon 6, Sam gains 20% Fire RES PEN in Complete Combustion state. Additionally, when using Enhanced Skill, Weakness Break efficiency is enhanced by 50%.

Firefly pros and cons in Honkai Star Rail

Here are the pros and cons of Firefly in Honkai Star Rail:

Pros	Cons
Easy to build	Team building needs investment
Free to play friendly
Amazing damage potential

Should you pull for Firefly in Honkai Star Rail?

Yes, you must pull for Firefly in Honkai Star Rail. She is probably one of the best DPS units in the game right now, right beside Acheron. She is also very easy to build as you do not need to go for Crit stats. Instead, Break Effect and ATK are the only stats you need which are easy to build.

As a free-to-play player you will deal damage very similar to how you might been watching in YouTube videos and showcases. The only issue with Firefly is that you need a dedicated team for her. You will have to build Gallagher and Harmony Trailblazer to make the most out of Firefly’s kit.

However, that is something which can be fixed with time. On the other hand, leaving Firefly will be a mistake as her damage output is simply unmatched.

Best Firefly team in Honkai Star Rail

The best team characters to pair alongside Firefly are Gallagher, Harmony Trailblazer, and Ruan Mei. In this team, Gallagher is the sustain who can also land debuffs on enemies. Harmony Trailblazer’s Super Break DMG mechanics synergizes very well with Firefly.

Finally, Ruan Mei is the best support when it comes to Weakness Break mechanics in the game.

Firefly trailer in Honkai Star Rail

On June 18, 2024, HoYoverse officially released Firefly’s trailer on their YouTube channel. If you did not watch it yet, you can check it out from the link provided below:

If you are looking to know more about Honkai Star Rail characters, check out our guides on Boothill and Fu Xuan. For more on the game in general, check out our guides on banners, codes, and the Version 2.3 update.