A member of the Stellaron Hunters and clad in a mechanical armor “SAM.” Firefly is one of the unique characters in Honkai: Star Rail introduced during your exploration in Penacony. She becomes playable in version 2.3.
Firefly Best Build
Firefly is a five-star fire element character who follows the Path of Destruction. She joined the Stellaron Hunters in search of the meaning of life, relentlessly pursuing ways to defy fate.
Keep in mind that Firefly is best paired with Harmony Trailblazer. Although not completely necessary, investing in Harmony Trailblazer is best if you aim for her full potential.
Best Set
| Best Relic Set | Best Planar Set | Best Light Cone |
|---|---|---|
 |  |  |
| Iron Cavalry Against the Scourge | Forge of the Kalpagni Lantern | Whereabouts Should Dreams Rest |
Here are Firefly's best relic set, planar, and light cone:
The 4-piece Iron Cavalry Against the Scourge is the best relic set for Firefly. It increases the Break Effect and ignores the enemy target's DEF, giving her the needed boost to her BE% and DEF shred. This setup is perfect for a break-focused build.
The Forge of the Kalpagni Lantern provides the wearer with increased SPD, and when the enemy target has a fire weakness, the wearer's BE% is increased by 40%. This Planar Set will help reach Firefly's desired SPD breakpoint without sacrificing too much on relic substats. However, if you have already reached your desired SPD without the Planar, then opt for Talia.
The Whereabouts Should Dreams Rest is Firefly's signature light cone, significantly boosting her Break Effect and damage. Break Effect is a crucial game mechanic that allows you to deal more damage to enemies. Is getting her signature light cone necessary? If you're aiming for maximum performance with a high BE%, then yes, you should get her signature light cone. Other alternative options can be obtained for free, but Firefly will have a lower damage output with those.
Recommended Stats
| Substats Priority: SPD (145+) > Break Effect% > ATK% | |||
| Body: ATK% | Feet: SPD | ||
| Planar Sphere: ATK% | Link Rope: Break Effect | ||
Note: What's amazing with Break Effect character like Firefly is you wouldn't need CRIT in your build since it does not scale from that. Focus on building and stacking more Break Effect. A bit of ATK is needed for additional bonuses on Firefly's ability.
Firefly Alternate Light Cones
| Light Cone | Effects | ||
 On the Fall of an Aeon | Whenever the wearer attacks, their ATK is increased by 8 – 16% in this battle, up to 4 time(s). When the wearer inflicts Weakness Break on enemies, the wearer's DMG increases by 12 – 24% for 2 turn(s). Obtained From: Herta's Store | ||
| At S5, On the Fall of an Aeon provides the needed ATK boost that enhances damage through Firefly's Core Overload, granting an additional Break Effect for every 10 ATK. Although it's not as powerful as Firefly's signature light cone, it is easy to obtain and is the best free-to-play alternative. | |||
 Indelible Promise | Increases the wearer's Break Effect by 28 – 56%. When the wearer uses their Ultimate, increases CRIT Rate by 15 – 30%, lasting for 2 turns. Obtained From: Stellar Warp | ||
| Best at S5, Indelible Promise gives a huge Break Effect%. If you don't have On the Fall of an Aeon, opt for Indelible Promise. Unfortunately, this light cone can only be obtained through Stellar Warp. | |||
 Something Irreplaceable | Increases the wearer's ATK by 24 – 40%. When the wearer defeats an enemy or is hit, immediately restores HP equal to 8 – 12% of the wearer's ATK. At the same time, the wearer's DMG is increased by 24 – 40% until the end of their next turn. This effect cannot stack and can only trigger 1 time per turn. Obtained From: Stellar Warp | ||
| It's not the most ideal, but if you don't have On the Fall of an Aeon available, use Something Irreplaceable. The ATK will be converted into the needed Break Effect.r Light Cone. | |||
Firefly Alternate Relic Set
DEF Ignore
| Relic Set | Effects | ||
 (4-piece) Genius of Brilliant Stars | (2) Increases Quantum DMG by 10%. (4) When the wearer deals DMG to the target enemy, ignores 10% DEF. If the target enemy has Quantum Weakness, the wearer additionally ignores 10% DEF. | ||
| Genius of Brilliant Stars should be a decent alternative for its DEF ignore since Break does not scale off of CRIT. The downside is you won't have a guaranteed quantum weakness on enemies since Firefly's best lineup does not include Silver Wolf or any quantum character. | |||
Break Effect
| Relic Set | Effects | ||
 (2-piece) Watchmaker, Master of Dream Machinations | (2) Increases Break Effect by 16%. | ||
 (2-piece) Thief of Shooting Meteor | (2) Increases Break Effect by 16% | ||
| Sacrificing Energy Regeneration from 4-piece Theif comes with an additional BE%. With (2) Watchmaker and (2) Thief, you get a permanent 32% increase in Break Effect. | |||
Firefly Alternate Planetary Set
| Planetary Set | Effects | ||
 (2-piece) Talia: Kingdom of Banditry | (2) Increases the wearer's Break Effect by 16%. When the wearer's SPD reaches 145 or higher, the wearer's Break effect increases by an extra 20%. | ||
| As mentioned, Talia: Kingdom of Banditry is understandably the next option for Planetary Set. It's a bit weaker than Forge of Kalpagni as it doesn't come with an SPD bonus, but if you have already reached the SPD breakpoint, Talia is your best option. It gives a solid break effect and more once your SPD reaches 145. | |||
Firefly Best Team
 Ruan Mei |  Trailblazer (Harmony) |  Gallagher |
| Ruan Mei provides RES PEN, which is great for boosting Firefly's Break. With the enemy delay, you can hit first before they can deal damage, increasing your survivability. Some may argue that Harmony Trailblazer isn't the best support, but they're the key to unleashing Firefly's full potential. They dramatically jump her Break Effect, allowing her to release an insane damage output. Gallagher would be the best sustain for a skill-point-hungry Firefly unless you went beyond E0. Then a lack of skill points shouldn't be an issue. | ||
Overview
Skills
| Skills | Effects |
|---|---|
| Order: Flare Propulsion (Basic Attack) | Deals Fire DMG equal to 50% – 100% of SAM's ATK to a single target enemy. |
| Fyrefly Type-IV: Pyrogenic Decimation (Basic Attack Enhanced) | Restores HP by an amount equal to 20% of this unit's Max HP. Deals Fire DMG equal to 100% – 162.5% of SAM's ATK to a single target enemy. |
| Order: Aerial Bombardment (Skill) | Consumes SAM's HP equal to 40% of SAM's Max HP and regenerates a fixed amount of Energy equal to 50% – 62% of SAM's Max Energy. Deals Fire DMG equal to 100% – 220% 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 (Skill Enhanced) | 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% – 220%) of SAM's ATK to this target. At the same time, deals Fire DMG equal to (0.1 × Break Effect + 50% – 110%) of SAM's ATK to adjacent targets. The Break Effect taken into the calculation is capped at 360%. |
| Fyrefly Type-IV: Complete Combustion (Ultimate) | Upon entering the Complete Combustion state, Advances SAM's Action by 100% and gains Enhanced Basic ATK and Enhanced Skill. While in Complete Combustion, increases SPD by 30 – 63, 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% – 21%, 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. |
| Chrysalid Pyronexus (Talent) | 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% – 44%. During the Complete Combustion, the DMG Reduction remains at its maximum effect, and the Effect RES increases by 10% – 34%. 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. |
| Δ Order: Meteoric Incineration (Technique) | 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. |
Traces
| Major Traces | Effects |
|---|---|
| Module α: Antilag Outburst (A2) | During the Complete Combustion, attacking enemies that have no Fire Weakness can also reduce their Toughness, with the effect being equivalent to 55% of the original Toughness Reduction from abilities. |
| Module β: Autoreactive Armor (A4) | 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 γ: Core Overload (A6) | For every 10 of SAM's ATK that exceeds 1800, increases SAM's Break Effect by 0.8%. |
Eidolons
| Eidolons | Effect |
|---|---|
| In Reddened Chrysalis, I Once Rest (Eidolon 1) | When using the Enhanced Skill, ignores 15% of the target's DEF. And the Enhanced Skill does not consume Skill Points. |
| From Shattered Sky, I Free Fall (Eidolon 2) | 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). |
| Amidst Silenced Stars, I Deep Sleep (Eidolon 3) | Skill Lv. +2, up to a maximum of Lv. 15. Basic ATK Lv. +1, up to a maximum of Lv. 10. |
| Upon Lighted Fyrefly, I Soon Gaze (Eidolon 4) | While in Complete Combustion, increases SAM's Effect RES by 50%. |
| From Undreamt Night, I Thence Shine (Eidolon 5) | Ultimate Lv. +2, up to a maximum of Lv. 15. Talent Lv. +2, up to a maximum of Lv. 15. |
| In Finalized Morrow, I Full Bloom (Eidolon 6) | 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%. |
Ascension Materials
Looking for Boothill's Ascension Materials? Here is the list you need from Level 1 – Level 80!
| Materials | Obtain From |
|---|---|
| 308,000x Credit | Calyx: Great Mine |
| 15x Shards of Desires | Simulated Universe Enemies Memory Zone Meme Equilibrium Level 4+ Omni-Synthesizer (Synthesis & Exchange) |
| 65x Raging Heart | Stagnant Shadow: Shape of Ire Omni-Synthesizer (Exchange) |
| 15x Fragments of Impression | Simulated Universe Enemies Memory Zone Meme Equilibrium Level 2+ Omni-Synthesizer (Synthesis & Exchange) |
| 15x Tatters of Thought | Simulated Universe Enemies Calyx: Golden Memory Zone Meme Omni-Synthesizer (Exchange) Embers Exchange |
