Firefly is one of the most powerful DPS characters in Honkai Star Rail. As a 5-star Fire character following the Path of Destruction, she brings incredible Break damage that can demolish enemies quickly. Many people have already started maining her due to the destructive force she brings to their teams in Honkai Star Rail. This guide covers everything you need to build Firefly properly and maximize her damage potential.
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Table of Contents
About Firefly
Firefly transforms into SAM (Strategic Assault Mech) using Complete Combustion mode. Her Skill consumes 40% HP but restores 50% Energy and advances her action by 25%, letting her charge Ultimate quickly.
Her Ultimate enters Complete Combustion state with massive buffs. Speed increases to 60, Weakness Break Efficiency increases by 50%, and Break damage increases by 20%. Her Enhanced Skill implants Fire Weakness onto enemies, allowing her to break any enemy type.
The key to Firefly’s damage is Super Break. At 360% Break Effect, attacking Weakness Broken enemies converts Toughness Reduction into Super Break damage at 50% effectiveness. She can also damage enemies without Fire weakness at 55% effectiveness.
Best Light Cones for Firefly
Choosing the right light cone significantly improves Firefly’s damage output. Here are the best options:
| Light Cone | Rarity | Why It’s Good |
| Whereabouts Should Dreams Rest | 5-Star | Her signature with 60% Break Effect and Break DMG boost |
| On the Fall of an Aeon | 5-Star | Best free option with high ATK% that converts to Break Effect |
| The Seriousness of Breakfast | 4-Star | Provides ATK% and DMG increase after attacks |
| Indelible Promise | 4-Star | Increases Break Effect and damage when breaking enemies |
Best Relics for Firefly
Relics are crucial for building Firefly correctly. Here’s what you need:
Best Relic Set
The 4 piece Iron Cavalry Against the Scourge is Firefly’s best relic set. The 2 piece bonus gives 16% Break Effect. The 4 piece bonus allows Break damage to ignore 10% of enemy DEF. When Break Effect reaches 250% or higher, Super Break damage ignores an additional 15% DEF.
The 4 piece Thief of Shooting Meteor is an alternative that provides Break Effect and regenerates Energy when inflicting Weakness Break.
Best Planar Ornaments
For planar ornaments, use Forge of the Kalpagni Lantern for the Speed bonus and Break Effect increase. This set provides 6% Speed and 40% Break Effect when hitting enemies with Fire Weakness.
Talia: Kingdom of Banditry is another option that provides Break Effect and increases Action Advance when Speed reaches 145 or higher.
Main Stats and Substats
Focus on these stats for maximum damage:
Main Stats:
- Body: ATK%
- Feet: Speed
- Planar Sphere: ATK%
- Link Rope: Break Effect
Substats Priority:
- Break Effect
- Speed
- ATK%
Firefly needs 360% Break Effect in combat to deal maximum Super Break damage. Aim for at least 2600 ATK and 150 Speed as baseline targets. CRIT Rate and CRIT DMG are useless on Firefly since her damage comes entirely from Break damage.
Best Team Compositions
Firefly works in several team combinations. Here are some of the best:
- Premium Team: Firefly + Harmony Trailblazer + Ruan Mei + Lingsha
- Alternative Team 1: Firefly + Harmony Trailblazer + Fugue + Gallagher
- Alternative Team 2: Firefly + Harmony Trailblazer + Asta + Lynx
- New Meta Team: Firefly + Harmony Trailblazer + The Dahlia + Lingsha
Firefly requires Harmony Trailblazer in every team. This character provides Super Break damage that multiplies Firefly’s effectiveness.
Ruan Mei is Firefly’s best support partner. She provides Break Effect, Weakness Break Efficiency, and Speed buffs that stack perfectly with Firefly’s kit.
Lingsha serves as the best sustain option because she provides healing and increases Break damage taken by enemies. Gallagher is a strong free to play alternative.
The Dahlia is a new addition that works incredibly well with Firefly. She provides Super Break damage before enemies are broken and increases Weakness Break Efficiency by 50%.
Trace Priority
Level Firefly’s traces in this order:
- Ultimate (highest priority for Break Effect and Speed buffs)
- Talent (important for survivability)
- Skill and Basic Attack (lowest priority)
All three of Firefly’s bonus abilities are crucial for her Super Break damage output.
Eidolons Worth Considering
Firefly’s Eidolons are powerful but not necessary. Her E1 allows Enhanced Skill to ignore 15% DEF. Her E2 gives an extra turn when defeating or breaking enemies during Complete Combustion. However, Firefly functions perfectly well at E0 with proper team building.
Firefly is a must-pull character for players who enjoy Break team playstyles. Her ability to implant Fire Weakness and deal consistent Super Break damage makes her viable against any content.
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