Firefly vs Mydei
Firefly vs Mydei — two Destruction characters competing for the same roster slot.
TL;DR — Quick Pick
Pick Firefly if…
- You need a Fire Destruction unit and Firefly's kit matches your account gap.
- You prefer Break DPS gameplay over Mydei's Main DPS identity.
- Yes for Super Break—Firefly remains a top Fire Break carry.
Pick Mydei if…
- You need a Imaginary Destruction unit and Mydei's kit matches your account gap.
- You prefer Main DPS gameplay over Firefly's Break DPS identity.
- Yes—Mydei is a strong Imaginary HP-drain Destruction carry.
Firefly and Mydei are both Destruction investments that answer different account needs. Firefly (Fire, Break DPS) shines when Yes for Super Break—Firefly remains a top Fire Break carry.. Mydei (Imaginary, Main DPS) is the better commit when Yes—Mydei is a strong Imaginary HP-drain Destruction carry.. Compare signature builds, team requirements, and your existing supports before pulling either.
At a Glance
Strengths & Weaknesses
Firefly
- Ultimate “Fyrefly Type-IV: Complete Combustion” enters Complete Combustion with full action advance, SPD, and Break-boosted Enhanced attacks—most of the kit’s damage lives inside that window, not on filler Basics.
- Skill “Order: Aerial Bombardment” spends a large HP chunk to refund Energy and advance action—the rotation wants controlled self-damage, not panic healing that cancels the state.
- Talent “Chrysalid Pyronexus” scales DMG Reduction with low HP and locks max reduction in the burst state—survivability is written into the damage plan, not bolted on later.
- E0 without “Whereabouts Should Dreams Rest” is still clearable, but the gap versus a signature copy is larger than a single eidolon for most Destruction carries—plan the cone before deep eidolon hunting.
- HP-spend skills mean Firefly can soft-lock if sustain is weak or if a healer tops them up at the wrong time and breaks a low-HP / Charge condition.
- Firefly wants Break Effect supports and Toughness bars that can actually be broken; into awkward weakness line-ups the Complete Combustion / Break loop loses most of its damage.
Mydei
- Ultimate “Throne of Bones” Blast-hits the main target plus adjacent enemies—most of the kit’s damage lives inside that window, not on filler Basics.
- Skill “Deaths are Legion, Regrets are None” spends HP as a deliberate self-damage cost—the rotation wants controlled self-damage, not panic healing that cancels the state.
- “Blood for Blood” spends HP as a deliberate self-damage cost—cleaving a trash mob can snowball into another full Skill/Ult cycle.
- E0 without “A Thankless Coronation” is still clearable, but the gap versus a signature copy is larger than a single eidolon for most Destruction carries—plan the cone before deep eidolon hunting.
- HP-spend skills mean Mydei can soft-lock if sustain is weak or if a healer tops them up at the wrong time and breaks a low-HP / Charge condition.
- Extra-turn and single-target Ultimate patterns shine on bosses but stall in Pure Fiction unless adds die fast enough to proc the talent loop.
Shared Team Members
With Firefly
Tingyun amps Break Effect / action value so Toughness bars die on schedule.
With Mydei
Tingyun is the Advance / DMG amp — time their Skill/Ult for the carry’s damage window.
With Firefly
Pela enables Super Break / Toughness pressure rather than a generic CRIT Harmony slot.
With Mydei
Pela applies DEF shred / vulnerability so the carry’s multipliers actually land.
With Firefly
Gallagher keeps Toughness routes alive with heals (and Break-friendly sustain when built that way).
With Mydei
Gallagher covers HP / memosprite upkeep so the Remembrance loop does not collapse mid-wave.
Best Builds (Signature)
Light Cone
Whereabouts Should Dreams Rest
Relics
Scholar Lost in Erudition (4pc) + Inert Salsotto (2pc)
Body
CRIT Rate%
Feet
ATK%
Sphere
Fire DMG%
Rope
ATK%
Substats
CRIT Rate ≥ CRIT DMG > ATK% > SPD
Light Cone
A Thankless Coronation
Relics
Scholar Lost in Erudition (4pc) + Inert Salsotto (2pc)
Body
CRIT Rate%
Feet
ATK%
Sphere
Imaginary DMG%
Rope
ATK%
Substats
CRIT Rate ≥ CRIT DMG > ATK% > SPD
Who Should You Pull?
- You need a Fire Destruction unit and Firefly's kit matches your account gap.
- You prefer Break DPS gameplay over Mydei's Main DPS identity.
- Yes for Super Break—Firefly remains a top Fire Break carry.
- Ultimate “Fyrefly Type-IV: Complete Combustion” enters Complete Combustion with full action advance, SPD, and Break-boosted Enhanced attacks.
- Firefly is a stronger general pull priority for your roster.
- You need a Imaginary Destruction unit and Mydei's kit matches your account gap.
- You prefer Main DPS gameplay over Firefly's Break DPS identity.
- Yes—Mydei is a strong Imaginary HP-drain Destruction carry.
- Ultimate “Throne of Bones” Blast-hits the main target plus adjacent enemies.
- Mydei is a stronger general pull priority for your roster.