Theorylytics
ElectroBroadbladeSupport★★★★ 4-Star

Lumi

Lumi

Published 2026-07-20 · Updated 3.5+
Content Ratings
ToAA
WhiWaA
OverworldS
Should You Pull?FREE

Free—Lumi is Resonance Skill amp support. Liberation “Squeakie Express” deals a focused attribute damage hit as the named setup tool. Best with Carlotta / Xiangli Yao / Skill carries. Skill DMG Outro only pays if the next Resonator Skill-dumps. Skip when Taoqi or a premium Skill amp already covers the seat.

Lumi is a 4★ Electro Support who fights with a Broadblade. Liberation “Squeakie Express” deals a focused attribute damage hit as the named setup tool. Forte “Signal Light” enters Red Spotlight Mode. Outro “Escorting” amplifies the incoming Resonator’s damage on Outro handoff.

ElectroBroadbladeSupport4★Outro AmpTune

Overview

Quick Build

Weapon

Best-in-slot 5★ Broadblade

Signature / premium option when available — largest personal damage or utility spike.

Echo Set

Moonlit Clouds (5pc)

Default Sonata match for this role/element package.

4-Cost

Energy Regen

Main stat

3-Cost

Electro DMG / ATK%

Main stat

1-Cost

ATK%

Substats

Energy Regen > ATK% > CRIT

Strengths

  • Liberation “Squeakie Express” deals a focused attribute damage hit as the named setup tool — team value spikes when this window is online every rotation.
  • Forte “Signal Light” enters Red Spotlight Mode, so resource banking is mandatory, not optional filler.
  • Outro “Escorting” amplifies the incoming Resonator’s damage on Outro handoff — swap timing is part of the damage plan, not just Concerto filling.
  • Aerial / plunge routes give flexible dodge and reposition options mid-combo.

Weaknesses

  • Value collapses if you cannot use the Amplification niche on Outro “Escorting”.
  • ER / Concerto investment competes with DPS Echo farming until Liberation is reliable.
  • 4★ ceiling is real — expect to rotate them out when a premium option takes the same niche.

Forte Priority

1
EscortingHighest

“Escorting” — amplifies the incoming Resonator’s damage on Outro handoff.

2
Squeakie ExpressHighest

“Squeakie Express” — deals a focused attribute damage hit as the named setup tool. Level first.

3
Signal LightHigh

“Signal Light” — enters Red Spotlight Mode.

4
Searchlight ServiceHigh

Setup and energy / Concerto generation.

5
Special DeliveryMedium

Entry heal/buff — useful but not always the first upgrade.

Stat Priority

1
Energy Regen~120–135% ER
2
ATK% / HP%Match kit scaling
3
Electro DMGIf personal damage matters
4
CRIT Rate / DMGSecondary after ER
Rotation
General

Swap to Lumi → “Searchlight Service” setup → “Squeakie Express” / “Signal Light” buffs → “Escorting” to amplify the on-fielder.

S0+

Refine timings once you learn Concerto breakpoints for your specific team.

Weapons

1
Standard 5★ BroadbladeABIS

CRIT Rate / ATK%

Any well-refined 5★ Broadblade with CRIT or ATK.

Why it works —Flexible premium stand-in while farming signature.

2
DiscordBF2P Best

ATK% / Energy Regen

Accessible Broadblade option for early investment.

Why it works —Best F2P path — refine and swap off once a 5★ lands.

Echoes

SMoonlit CloudsBest in Slot
Energy Regen5pc
2PC2pc bonuses as listed in-game for this Sonata.
5PC5pc completes the set identity — farm this set first for the role.
Outro amp + energy — default support set.
AVoid ThunderFarmable
Electro DMG5pc
2PC2pc bonuses as listed in-game for this Sonata.
5PC5pc completes the set identity — farm this set first for the role.
When the Support still deals meaningful personal damage.

Team Compositions

Jinhsi core with Lumi: Verina is the fast generalist heal + ATK / DMG amp seat. Lumi opens Stellarealm / heals, then Jinhsi takes the buffed damage window.

Character Synergy
Jinhsi
JinhsiMain DPS

Jinhsi is the on-fielder this shell is built around — Lumi keeps them alive and buffed through Liberation.

Lumi
LumiSupport

Lumi enables this shell — keep Outro / setup online every rotation for Jinhsi + Verina.

Verina
VerinaHealer

Verina is the fast generalist heal seat — ATK-scaling heals plus 15% team DMG Amplify with a short Concerto cycle for Jinhsi.

Forte & Resonance Chain

Forte

Normal AttackNavigation Support

Yellow Light: Basic Attack Summon Squeakie to shoot three shots in a row, dealing Electro DMG. Yellow Light: Sprint Dodge to perform Sprint and enter Zoom Mode. Lumi is unable to Dodge when performing Sprint. Yellow Light: Zoom When in this state, automatically shoot Glitters at a locked-on target and deal Electro DMG, considered Basic Attack DMG. Yellow Light: Plunging Attack Consume STA to perform a Plunging Attack, dealing Electro DMG. Red Light: Basic Attack Perform up to 3 consecutive attacks, dealing Electro DMG. Red Light: Heavy Attack Consume STA to strike the ground with Squeakie, causing an impact dealing Electro DMG, considered Basic Attack DMG. Red Light: Plunging Attack Consume STA to perform a Plunging Attack, dealing Electro DMG. Red Light: Dodge Counter Use Basic Attack right after a successful Dodge to attack the target, dealing Electro DMG.

Resonance SkillSearchlight Service

Pounce When in Yellow Light Mode, use Resonance Skill to perform Pounce, which consumes STA to pounce on the target before switching to Red Light Mode. Lumi will perform a Pounce without STA cost when switched onto the field. Rebound When in Red Light Mode, use Resonance Skill to perform Rebound, which consumes STA to leap backward and attack the target before switching to Yellow Light Mode. Yellow Light Mode Perform ranged attacks when in Yellow Light Mode. Red Light Mode Perform melee attacks when in Red Light Mode.

Resonance LiberationSqueakie Express

Throw the giant Squeakie at the target, dealing Electro DMG.

Intro SkillSpecial Delivery

Enter Yellow Light Mode and attack the target, dealing Electro DMG.

Outro SkillEscorting

The incoming Resonator has their Resonance Skill DMG Amplified by 38% for 10s or until they are switched out.

Tune BreakTune Break: Broadblade

When the target's Off-Tune Level is full, the Resonator may cast Tune Break on the target.

Forte CircuitSignal Light

Energized Pounce When Yellow Light Spark is fully recovered, replace Resonance Skill with Resonance Skill Energized Pounce that deals Electro DMG and enter Red Spotlight Mode. The DMG dealt is considered Basic Attack DMG. When in Red Spotlight Mode, the DMG Multiplier of Red Light: Basic Attack and Red Light: Heavy Attack is increased, with an extra amount of Sparks recovered. Red Spotlight Mode ends after performing altogether 4 Basic Attacks and/or Heavy Attacks. Energized Rebound When Red Light Spark is fully recovered, replace Resonance Skill with Resonance Skill Energized Rebound that deals Electro DMG and enter Yellow Spotlight Mode. The DMG dealt is considered Basic Attack DMG. When in Yellow Spotlight Mode, Glitter is replaced by Glare, with an increased DMG Multiplier and an extra amount of Sparks recovered. Yellow Spotlight Mode ends after shooting 6 Glares. Laser Casting Outro Skill consumes all Sparks obtained in the current mode. Laser can be cast when the amount of consumed Sparks is greater than or equal to 25, dealing Electro DMG. The DMG dealt is considered Basic Attack DMG. Every 25 Sparks consumed generates 1 extra Laser beam, up to 4 Laser beams. Yellow Light Spark Lumi can hold up to 100 Yellow Light Sparks. Lumi obtains Yellow Light Spark under the following conditions: When Yellow Light: Basic Attack hits the target; When Glitter hits the target; When Glare hits the target; When Resonance Skill Energized Rebound hits the target; When casting Intro Skill Special Delivery. Red Light Spark Lumi can hold up to 100 Red Light Sparks. Lumi obtains Red Light Spark under the following conditions: When Normal Attack Navigation Support hits the target in Red Light Mode or Red Spotlight Mode.

Inherent SkillPathfinding

Gain 10% Electro DMG Bonus when in Red Light Mode.

Inherent SkillExpediting

Casting Energized Pounce or Energized Rebound increases ATK by 10% for 5s.

Inherent SkillSkillful Cooking

Has a chance to produce special dishes when cooking.

Resonance Chain

1
S1
2
S2
3
S3
4
S4
5
S5
6
S6
S1Parcel To Be Delivered

After casting Energized Rebound, additionally recovers 60 STA within 3s.

Is it worth getting?

Small 4★ bump: After casting Energized Rebound, additionally recovers 60 STA within 3s. Take Wavebands when they appear on rate-up; never the reason you pull the banner.

S2Lollo Logistics, Ready to Help

Energized Pounce and Energized Rebound ignore 20% of the target's DEF.

Is it worth getting?

Meaningful upgrade: Adds RES / DEF shred or a large DMG Bonus clause. Strong when it lands, but weigh it against a new limited teammate.

S3Priority Parcel In Transit

The DMG of Resonance Liberation Squeakie Express is increased by 30%.

Is it worth getting?

Situational S3: Adds RES / DEF shred or a large DMG Bonus clause.

S4Captain Lumi, At Your Service

Gain 30% Basic Attack DMG Bonus.

Is it worth getting?

Side-grade: Adds RES / DEF shred or a large DMG Bonus clause. Happy if it drops; not a planned stopping point.

S5Parcel Collected On TimeSkip

When Spark is fully recovered, Laser DMG Multiplier is increased by 100%.

Is it worth getting?

Late luxury: When Spark is fully recovered, Laser DMG Multiplier is increased by 100%. Grab it if you overshoot toward S6 — never hard-pity for S5 alone.

S6Give Me A Five-star RatingSkip

Casting Resonance Liberation Squeakie Express increases all team members' ATK by 20% for 20s.

Is it worth getting?

Whale ceiling: Raises party ATK from a Stellarealm / team aura. Only chase if Lumi is your dedicated main and S0–S2 already feel finished.

Lumi is designed to work at S0. Extra Sequences are comfort from rate-up dupes, not requirements.

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