characters Firefly

Firefly

DestructionFire5★Released: 23/07/2025 · v3.4
AR-26710

“Fyreflies are such magical creatures, aren’t they? They may throw themselves at a flame or suddenly grow old, but every night before that, they will shine brighter than the stars.”

Other Names
AR-26710 Sam
Species
Human
Path story
Finality
Signature Light Cone
Whereabouts Should Dreams Rest
Debut Banner
Firefull Flyshine
Release Date
2024-06-19
Version
introduced in 1.6, playable from 2.3

Faction

  • Stellaron Hunters
  • Iron Cavalry
EN Analesa Fisher SAM: Adin Rudd
CN Song Yuanyuan (宋媛媛) SAM: Gan Ziqi (淦子齐)
JP Kusunoki Tomori (楠木ともり) SAM: Kasama Jun (笠間淳)
KR Yu Hye-ji (유혜지) SAM: Jang Seo-hwa (장서화)

Playstyle overview

Firefly is a damage dealer who fights in the SAM battle armor and gains enhanced abilities by entering Complete Combustion through her Ultimate. In Complete Combustion, SAM’s Break Efficiency and Break DMG increase, and she can apply Toughness reduction to enemies that have no Fire Weakness. She can also add a Fire Weakness to enemies with her Technique or her Enhanced Skill.

Stats Base

Lv. 80
  • HP Base
  • ATK Base
  • DEF Base
  • SPD
  • Taunt

Ascension Materials

20304050607080
Pros & Cons

Pros

  • A very good Super Break DPS
  • Continuously implants Fire Weakness on several enemies at once
  • Naturally very high Toughness damage
  • Naturally very tanky, which makes sustainless teams easy to run
  • A very fast character with built-in SPD buffs and action advance
  • Completely self-sufficient on Energy
  • An accessible low-cost team with the Harmony Trailblazer, Ruan Mei, and Gallagher

Cons

  • The premium team is an enormous upgrade
  • Burns through Skill Points extremely fast
  • The Herta is nearly mandatory against today's Toughness bar values
  • Demands very high stat investment to reach her peak

Best Firefly Build Guide

DPS Build - Break Effect

Stat Targets

  • Break Effect 360% or higher (in combat)
  • ATK 2600 or higher
  • SPD 150
  • SPD 164 (with Ruan Mei)
  • SPD 178-188 (with The Dahlia)
  • HP% 2600+

Most of Firefly’s damage comes from Break Effect, so CRIT stats do not matter for her. ATK is also important because it feeds into her Break Effect.

Firefly should aim for a total of 360% Break Effect in combat to deal maximum Super Break DMG from her Trace (Module β: Autoreactive Armor). Break support characters and Relic sets can help you reach that threshold.

At least 2600 ATK is recommended, because that converts into 64% Break Effect for Firefly, making the 360% Break Effect target much easier to hit.

150 SPD is the ideal target for Firefly, because it lets her take more turns before Complete Combustion ends.

You can also try to push her base SPD to 154, which becomes 164 SPD with Ruan Mei’s buff. This is an important speed breakpoint, because it lets you act 3 times in the first cycle (MoC or PF) and gain 1 extra turn during Firefly’s Complete Combustion.

Technically, Firefly’s true speed breakpoint with Ruan Mei is 164.34, which is reachable with Ruan Mei’s Talent at level 10. However, since the game does not display decimals, people generally recommend building 155 base SPD to be certain you always hit the breakpoint.

Firefly Skill, Trace and Eidolon Upgrade Priority

Skill Priority

biểu tượng Tuyệt Kỹ firefly Fyrefly Type-IV: Complete Combustion biểu tượng chiến kỹ firefly Order: Aerial Bombardment biểu tượng thiên phú firefly Chrysalid Pyronexus biểu tượng tấn công thường firefly Order: Flare Propulsion

Trace Priority

biểu tượng vết tích firefly bậc 2 Module α: Antilag Outburst biểu tượng vết tích firefly bậc 4 Module β: Autoreactive Armor biểu tượng vết tích firefly bậc 6 Module γ: Core Overload

Eidolon Priority

tinh hồn firefly 1 In Reddened Chrysalis, I Once Rest tinh hồn firefly 2 From Shattered Sky, I Free Fall tinh hồn firefly 6 In Finalized Morrow, I Full Bloom

Firefly Skills

Basic ATK

Order: Flare Propulsion

[Single Target]
Energy Generated20
Toughness Break Single Target: 10

Deals Fire DMG equal to 140% of SAM’s ATK to one designated enemy.

Lv. 10

Upgrade Materials

Lv. 1 to Lv. 10

Order: Aerial Bombardment

[Single Target]
Energy Generated30
Toughness Break Single Target: 20

Consumes HP equal to 40% of this unit’s Max HP and regenerates a fixed amount of Energy equal to 65% of this unit’s Max Energy. Deals Fire DMG equal to 250% of SAM’s ATK to one designated enemy. If the current HP is not sufficient, reduces SAM’s HP to 1 when using this Skill. Advances this unit’s next Action by 25%.

Lv. 15

Upgrade Materials

Lv. 1 to Lv. 15

Fyrefly Type-IV: Complete Combustion

[Enhance]
Energy Generated5

Enters 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 75, and when using the Enhanced Basic ATK or Enhanced Skill, increases this unit’s Weakness Break Efficiency by 50% and increases the Break DMG dealt by SAM to the enemy targets by 25.0%, lasting until this current attack ends.
A countdown timer for the Complete Combustion state appears in the Action Order. When the countdown timer’s turn starts, SAM exits the Complete Combustion state. The countdown timer has a fixed SPD of 70.
SAM cannot use Ultimate while in Complete Combustion.

Lv. 15

Upgrade Materials

Lv. 1 to Lv. 15

Chrysalid Pyronexus

[Defense]
Energy Generated5

The lower the HP, the less DMG received. When HP is 20% or lower, the DMG Reduction reaches its maximum effect, reducing up to 50%. During the Complete Combustion, the DMG Reduction remains at its maximum effect, and the Effect RES increases by 40%.
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.

Lv. 15

Upgrade Materials

Lv. 1 to Lv. 15

Δ Order: Meteoric Incineration

Energy Generated20

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.

Firefly Traces

Total Trace Bonuses
  • Break Effect +37.3%
  • Effect RES +18%
  • SPD +5

Firefly Eidolons

In Reddened Chrysalis, I Once Rest
Eidolon 1

When using the Enhanced Skill, ignores 15% of the target’s DEF. The Enhanced Skill does not consume Skill Points.

From Shattered Sky, I Free Fall
Eidolon 2

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 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 Weakness Break Efficiency by 50%.