Best Light Cones for Firefly in Honkai: Star Rail

The top pick for Firefly is Whereabouts Should Dreams Rest (her signature light cone), because it provides a massive boost to Break Effect, Energy Regeneration, and Super Break damage—everything her kit needs to shine. If you don’t have that, On the Fall of an Aeon (free from Herta’s Store) is the best budget option, offering a strong ATK% boost that scales well with her ultimate and talent.

What to Look For

Firefly is a Break DPS who relies on Super Break damage, so the usual ATK/Crit stats matter less. When choosing a light cone, prioritize:

• Break Effect (BE): The single most important stat. It directly increases her Super Break damage and her talent’s Fire DMG bonus (up to 360% BE).
• Energy Regeneration (ERR): Firefly wants to use her ultimate every 3 turns. ERR helps her get there faster, especially without her signature cone.
• ATK%: Her base kit converts ATK to Break Effect (up to 200% of her ATK). So ATK% is effectively a secondary way to boost BE.
• Super Break DMG Bonus: Some cones (like her signature) directly boost this, which is multiplicative with Break Effect.
• SP Efficiency: Firefly is SP-hungry (her skill costs 2 SP). Cones that refund SP or reduce skill cost are valuable.

Avoid cones that only boost Crit Rate/DMG—Firefly’s damage is not crit-based in her standard build.

Whereabouts Should Dreams Rest (Signature)

Strengths: This cone is tailor-made for Firefly. It gives 60% Break Effect at S1, 12% Energy Regeneration, and after using her ultimate, it increases her Super Break DMG by 24% for 2 turns. It also restores 1 Skill Point when she breaks an enemy’s weakness, which helps with her SP-hungry rotation.

Trade-offs: It’s a limited 5-star, so you need to pull on the light cone banner. It offers no ATK% directly, but the BE and Super Break boost more than compensate.

Best for: Players who want the absolute maximum damage output and don’t mind investing in the gacha.

On the Fall of an Aeon (Herta Store)

Strengths: This is the best free option. It provides 16% ATK% at S5, and when Firefly attacks, she gains 8% ATK% stacking up to 4 times (32% total). Since her ultimate and talent convert ATK to Break Effect, this effectively gives her a huge stat boost. It’s also a 5-star cone, so its base stats are higher than 4-stars.

Trade-offs: No direct Break Effect or ERR. You’ll need to rely on relics and rope to hit high BE. It also requires you to farm Herta’s Store currency (Hertareum) which takes time.

Best for: F2P players and anyone who hasn’t pulled the signature cone. At S5, it’s competitive with low-refinement 5-star options.

Indelible Promise (Battle Pass)

Strengths: This 4-star cone gives 56% Break Effect at S5 and 12% Energy Regeneration. It also increases Firefly’s Break Effect by 20% for 2 turns after she uses her ultimate. This is a solid mix of BE and ERR, making it a great middle ground.

Trade-offs: It’s only available through the Battle Pass (paid). It has lower base stats than 5-star cones, and the post-ult BE boost is conditional.

Best for: Light spenders who want a strong 4-star option without pulling on the limited banner.

Memories of the Past (Gacha 4-star)

Strengths: This cone provides 56% Break Effect at S5 and 28% Energy Regeneration at S5. The ERR is huge—it helps Firefly get her ultimate back in 3 turns even without her signature. It’s also a 4-star, so it’s easier to superimpose.

Trade-offs: No ATK% or Super Break boost. The base stats are lower than 5-stars. It also has a passive that only boosts Break Effect on the wearer’s next attack after using their ultimate, which is less consistent.

Best for: Players who need ERR more than ATK and have a few copies of this cone lying around. It’s a great budget option for 3-turn ult rotations.

Make the World Clamor (Event 4-star)

Strengths: This free event cone (from 1.4) gives 32% Break Effect at S5 and 12% Energy Regeneration. It also increases Firefly’s Break Effect by 20% for 2 turns after she uses her ultimate, similar to Indelible Promise. It’s a decent free alternative if you missed the Battle Pass cone.

Trade-offs: Lower BE than Indelible Promise at S5 (32% vs 56%). The event is no longer available, so if you missed it, you can’t get it.

Best for: Players who have it from the event and want a free BE+ERR option.

Nowhere to Run (Gacha 4-star)

Strengths: This cone gives 24% ATK% at S5 and restores HP when the wearer defeats an enemy. The ATK% is useful for Firefly’s conversion, and the HP restore helps with sustain in Simulated Universe.

Trade-offs: No Break Effect or ERR. The ATK% is lower than On the Fall of an Aeon. The HP restore is situational and not needed in most content.

Best for: A temporary option if you have nothing else. It’s not worth building around.

How to Choose

Your choice depends on your budget and how much you want to invest in Firefly.

• F2P / no pulls: Use On the Fall of an Aeon (S5) from Herta’s Store. It’s free, has high base stats, and the ATK% is excellent. Pair it with Break Effect relics and rope to reach 200%+ BE.
• Light spender / Battle Pass: Indelible Promise (S5) is a solid upgrade over the free option, offering BE and ERR in one package. If you have Memories of the Past at high superimposition, it’s also strong for faster ult rotations.
• Whale / max damage: Pull for Whereabouts Should Dreams Rest. The Super Break DMG boost and SP refund are unmatched. Even at S1, it’s a significant damage increase over any other cone.

Common trade-offs: ERR vs ATK—if you can hit 3-turn ult without ERR (using energy rope or specific team comps), you can opt for ATK% cones. BE vs Super Break DMG—Super Break DMG is multiplicative with BE, so it’s often better, but you need both to be effective.

Frequently Asked Questions

Is Firefly’s signature light cone worth pulling?

Yes, if you plan to use Firefly as your main DPS. It provides a 60% Break Effect boost, 12% ERR, and a 24% Super Break DMG boost after her ultimate. No other cone comes close.

Can I use a 4-star light cone on Firefly?

Absolutely. Indelible Promise and Memories of the Past are both excellent 4-star options. They won’t reach the same peak as the signature, but they’re more than enough for all content.

Does Firefly need Energy Regeneration?

Yes, to maintain her ultimate uptime. Her ultimate costs 240 energy, and she needs to use it every 3 turns. ERR from cones or an energy rope helps achieve that. Without ERR, she may need 4 turns, which hurts her damage.

Is ATK% or Break Effect better for Firefly?

Break Effect is better in most cases, but ATK% is also valuable because her talent converts ATK to BE (up to 200% of ATK). In practice, you want both. A good balance is around 200% Break Effect and 2000+ ATK.

Should I use a Crit light cone on Firefly?

No. Firefly’s damage is not crit-based in her standard build. Crit cones like In the Night or Sleep Like the Dead are wasted on her. Stick to BE or ATK cones.

What about the light cone ‘The Moles Welcome You’?

That cone gives ATK% and DEF% reduction, but it’s not ideal for Firefly. It lacks Break Effect and ERR, and the DEF shred is negligible. Use it only if you have nothing else.

Bottom Line

For maximum performance, pull Whereabouts Should Dreams Rest. For a free option, On the Fall of an Aeon is your best bet. If you have a Battle Pass, Indelible Promise is a great middle ground. Ultimately, any cone that provides Break Effect or ATK% will work—just avoid crit-based cones and prioritize energy for a smooth rotation.

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