Firefly Honkai: Star Rail fighter artwork
Honkai: Star Rail Move & Ability Guide

Firefly moves, skills and special abilities

Move & Ability Guide

Firefly: 5-Star, Fire, The Destruction. Faction: Stellaron Hunter — ???.

42 ability entries2 Skills2 Ultimates2 Talent6 Bonus Trace20 Stat Trace2 Technique2 Basic Atk6 Eidolon

Skills

2
Order: Aerial Bombardment
Skill

Toughness Break: 20 Consumes SAM's HP equal to 40% of SAM's maximum HP and regenerates a fixed amount of Energy equal to 60% of SAM's Max Energy. Inflicts Fire damage equals to 200% 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 Toughness Break: 30 Recovers HP by an amount equal to 25% of this unit's maximum HP. Applies Fire Weakness to a single target enemy, lasting for 2 turn(s). Inflicts Fire damage equal to (0.2 x Break Effect + 100% ) of SAM's ATK to this target. At the same time, deal Fire damage equal to (0.10 x Break Effect + 50.0% ) of SAM's ATK to adjacent targets. The Break Effect taken into the calculation is capped at 360%.

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Order: Aerial Bombardment (Enhanced)
Skill

Toughness Break: 20 Consumes SAM's HP equal to 40% of SAM's maximum HP and regenerates a fixed amount of Energy equal to 60% of SAM's Max Energy. Inflicts Fire damage equals to 200% 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 Toughness Break: 30 Recovers HP by an amount equal to 25% of this unit's maximum HP. Applies Fire Weakness to one designated enemy and its adjacent targets, lasting for 2 turn(s). Inflicts Fire damage equal to (0.2 x Break Effect + 100% ) of SAM's ATK to this target. At the same time, deal Fire damage equal to (0.10 x Break Effect + 50.0% ) of SAM's ATK to adjacent targets. The Break Effect taken into the calculation is capped at 360%.

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.

Ultimates

2
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 60 , and when using the Enhance Basic ATK or Enhance Skill, increases this unit's Weakness Break efficiency by 50% and Break damage received by enemy targets by 20.0% , 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 Complete Combustion state. The countdown has a fixed SPD of 70.

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Fyrefly Type-IV: Complete Combustion (Enhanced)
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 60 , and when using the Enhance Basic ATK or Enhance Skill, increases this unit's Weakness Break efficiency by 50% and Break damage received by enemy targets by 20.0% , 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 Complete Combustion state. The countdown has a fixed SPD of 70.

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.

Talent

2
Chrysalid Pyronexus
Talent

The lower the HP, the less damage received. When HP is 20% or lower, the damage Reduction reaches its maximum effect, reducing up to 40% . During the Complete Combustion, the damage Reduction remains at its maximum effect, and the Effect RES increases by 30% . If Energy is lowered than 50% when the battle starts, regenerates Energy to 50%. Once Energy is regenerated to its maximum, dispels all debuffs on this unit.

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Chrysalid Pyronexus (Enhanced)
Talent

The lower the HP, the less damage received. When HP is 20% or lower, the damage Reduction reaches its maximum effect, reducing up to 40% . During the Complete Combustion, the damage Reduction remains at its maximum effect, and the Effect RES increases by 30% . If Energy is lowered than 50% when the battle starts, regenerates Energy to 50%. Once Energy is regenerated to its maximum, dispels all debuffs on this unit.

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.

Bonus Trace

6
Module γ: Core Overload
Bonus Trace

For every 10 of SAM's ATK that exceeds 1,800, increases SAM's Break Effect by 0.8%.

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Module β: Autoreactive Armor
Bonus Trace

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 30%/50% Super Break damage.

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Mode α: Antilag Outburst
Bonus Trace

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 abilites.

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Module γ: Core Overload (Enhanced)
Bonus Trace

For every 10 of SAM's ATK that exceeds 1,800, increases SAM's Break Effect by 0.8%.

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Module β: Autoreactive Armor (Enhanced)
Bonus Trace

When SAM is in Complete Combustion with a Break Effect that is equal to or greater than 150%/300%, attacking a Weakness-Broken enemy target will convert the Toughness Reduction of this attack into 1 instance of 100%/150% Super Break damage.

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Mode α: Antilag Outburst (Enhanced)
Bonus Trace

While in the Complete Combustion state, SAM's Break Effect increases by 25%. When using Enhanced Basic ATK or Enhanced Skill to inflict Weakness Break on a target, the Complete Combustion countdown is delayed by 10%. This effect can trigger a maximum of 3 time(s) during each Complete Combustion state.

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.

Stat Trace

20
SPD Boost
Stat Trace

SPD increases by 3

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Break Boost
Stat Trace

Break Effect increases by 10.7%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Effect RES Boost
Stat Trace

Effect RES increases by 8.0%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Break Boost
Stat Trace

Break Effect increases by 5.3%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Break Boost
Stat Trace

Break Effect increases by 8.0%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Effect RES Boost
Stat Trace

Effect RES increases by 6.0%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Break Boost
Stat Trace

Break Effect increases by 8.0%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Effect RES Boost
Stat Trace

Effect RES increases by 4.0%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Break Boost
Stat Trace

Break Effect increases by 5.3%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
SPD Boost
Stat Trace

SPD increases by 2

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
SPD Boost (Enhanced)
Stat Trace

SPD increases by 3

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Break Boost (Enhanced)
Stat Trace

Break Effect increases by 10.7%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Effect RES Boost (Enhanced)
Stat Trace

Effect RES increases by 8.0%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Break Boost (Enhanced)
Stat Trace

Break Effect increases by 5.3%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Break Boost (Enhanced)
Stat Trace

Break Effect increases by 8.0%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Effect RES Boost (Enhanced)
Stat Trace

Effect RES increases by 6.0%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Break Boost (Enhanced)
Stat Trace

Break Effect increases by 8.0%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Effect RES Boost (Enhanced)
Stat Trace

Effect RES increases by 4.0%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Break Boost (Enhanced)
Stat Trace

Break Effect increases by 5.3%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
SPD Boost (Enhanced)
Stat Trace

SPD increases by 2

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.

Technique

2
Δ Order: Meteoric Incineratoin
Technique

Toughness Break: 20 Leaps into the air and moves about freely for 5 seconds, which can 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, inflicts Fire damage equal to 200% of SAM's ATK to all enemies.

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Δ Order: Meteoric Incineratoin (Enhanced)
Technique

Toughness Break: 20 Leaps into the air and moves about freely for 5 seconds, which can 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, inflicts Fire damage equal to 200% of SAM's ATK to all enemies.

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.

Basic Atk

2
Order: Flare Propulsion
Basic ATK

Toughness Break: 10 Inflicts Fire damage equal to 100% of SAM's ATK to a single target enemy. Fyrefly Type-IV: Pyrogenic Decimation Toughness Break: 15 Recovers HP by an amount equal to 20% of this unit's maximum HP. Inflicts Fire damage equal to 200% of SAM's ATK to a single target enemy.

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Order: Flare Propulsion (Enhanced)
Basic ATK

Toughness Break: 10 Inflicts Fire damage equal to 100% of SAM's ATK to a single target enemy. Fyrefly Type-IV: Pyrogenic Decimation Toughness Break: 15 Recovers HP by an amount equal to 20% of this unit's maximum HP. Inflicts Fire damage equal to 200% of SAM's ATK to a single target enemy.

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.

Eidolon

6
In Reddened Chrysalis, I Once Rest
Eidolon

When using the Enhanced Skill, ignore 15% of the target's DEF. And Enhanced skill does not consume Skill Points.

Requirements / unlock: Eidolon 1

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
From Shattered Sky, I Free Fall
Eidolon

Pre-Enhanced: When using the Enhanced Basic ATK or Enhanced Skill in Complete Combustion Skill 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). Enhanced: 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.

Requirements / unlock: Eidolon 2

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Amidst Silenced Stars, I Deep Sleep
Eidolon

Skill Lv. +2, up to a maximum of Lv. 15 Basic ATK Lv. +1, up to a maximum of Lv. 10

Requirements / unlock: Eidolon 3

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Upon Lighted Fyrefly, I Soon Gaze
Eidolon

While in Complete Combustion, increases SAM's Effect RES by 50%.

Requirements / unlock: Eidolon 4

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
From Undreamt Night, I Thence Shine
Eidolon

Ultimate Lv. +2, up to a maximum of Lv. 15 Talent Lv. +2, up to a maximum of Lv. 15

Requirements / unlock: Eidolon 5

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
In Finalized Morrow, I Full Bloom
Eidolon

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%.

Requirements / unlock: Eidolon 6

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.