Fire Harmony

Asta

Lead Researcher of Herta Space Station

TierA
RolesSupport · Amplifier
Release1.0

Asta is a 4★ Fire Harmony support. Her Skill bounces between enemies to build Charging stacks, each raising the whole team's ATK by 14% (up to 70%), and her Ultimate gives every ally +50 SPD for 2 turns. Outclassed by limited Harmony characters in most teams, she has found a new niche with Silver Wolf LV.999, whose A2 turns that flat SPD into Elation.

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Asta

SPD support

Light Cones

Dance! Dance! Dance! BiS
4★
Prydwen's top pick (S5): each Ultimate advances all allies' actions on top of her +50 SPD — the go-to choice with Silver Wolf LV.999.
Using the Ultimate advances all allies' actions by 16%.
But the Battle Isn't Over
5★
Standard 5★ and Game8's top pick: Energy Regeneration, Skill Point recovery, and +30% DMG for the next ally to act after her Skill.
Energy Regeneration Rate +10%; the Ultimate on an ally recovers 1 Skill Point every 2 uses, and the Skill gives the next ally to act +30% DMG.
Memories of the Past
4★
4★: extra Energy on every attack, plus Break Effect for Break teams.
Break Effect +28%, and attacking regenerates 4 extra Energy once per turn.
Carve the Moon, Weave the Clouds
4★
4★: a random team buff every turn (ATK, CRIT DMG or Energy Regeneration).
At the start of battle and of each of the wearer's turns, all allies get a random buff: ATK +10%, CRIT DMG +12% or Energy Regeneration Rate +6%.
Meshing Cogs
3★ F2P option: extra Energy when attacking or getting hit, at the cost of every other bonus.
Regenerates 4 extra Energy after attacking or being hit, once per turn.
Planetary Rendezvous
4★
4★ for mono-Fire teams: +12% DMG for allies of her Type.
After entering battle, allies of the same Type as the wearer deal 12% more DMG.

Relics

Messenger Traversing Hackerspace ×4
Best set for both sources: her Ultimate targets allies, so it adds +12% SPD for the whole team for 1 turn on top of her own buff.
Set effects
2pIncreases SPD by 6%.
4pWhen the wearer uses their Ultimate on an ally, SPD for all allies increases by 12% for 1 turn(s). This effect cannot be stacked.
Watchmaker, Master of Dream Machinations ×4
Break teams only: +30% Break Effect for all allies for 2 turns after her Ultimate.
Set effects
2pIncreases Break Effect by 16%.
4pWhen the wearer uses their Ultimate on an ally, all allies' Break Effect increases by 30% for 2 turn(s). This effect cannot be stacked.
Eagle of Twilight Line ×4
Specialist option: a 25% action advance after each Ultimate, for more frequent SPD buffs.
Set effects
2pIncreases Wind DMG by 10%.
4pAfter the wearer uses their Ultimate, their action is Advanced Forward by 25%.

Planar ornaments

Sprightly Vonwacq ×2
Prydwen's top pick: a 40% action advance at the start of battle at 120 SPD, so she buffs the team sooner, plus Energy Regeneration.
Set effects
2pIncreases the wearer's Energy Regeneration Rate by 5%. When the wearer's SPD reaches 120 or higher, the wearer's action is Advanced Forward by 40% immediately upon entering battle.
Broken Keel ×2
Game8's top pick for CRIT-based teams: +10% CRIT DMG for all allies once she reaches 30% Effect RES.
Set effects
2pIncreases the wearer's Effect RES by 10%. When the wearer's Effect RES is at 30% or higher, all allies' CRIT DMG increases by 10%.
Fleet of the Ageless ×2
+8% ATK for all allies at 120 SPD — the best choice for DoT teams.
Set effects
2pIncreases the wearer's Max HP by 12%. When the wearer's SPD reaches 120 or higher, all allies' ATK increases by 8%.

Main stats

Body
HP% / DEF%
Feet
SPD
Planar Sphere
Fire DMG Boost / HP% / DEF%
Link Rope
Energy Regeneration Rate

Substat priority

1SPD 2HP% 3DEF% 4Effect RES

Stat targets

  • SPD: 134, 143 (recommended) or 160+
  • HP: 3,600–4,400+
  • DEF: 900–1,100+
  • Energy Regeneration Rate: 19.44% (Energy Regeneration Rope)
  • Effect RES: 30% if you use Broken Keel

Talent priority

Talent
Ultimate
Skill
Basic ATK

Talent and Ultimate are equal priority. Major Trace priority: Ignite (A4) > Sparks (A2) > Constellation (A6).

Teams

Recommended teams

Budget Silver Wolf LV.999

Silver Wolf LV.999
Trailblazer (Elation)
Asta
Dan Heng • Permansor Terrae

Her new niche: Silver Wolf's A2 converts Asta's flat SPD buff into Elation, and the free Trailblazer (Elation) supplies Punchline and Certified Banger.

Kafka DoT

Kafka
Black Swan
Asta
Huohuo

Her SPD lets Kafka and Black Swan act more often between enemy turns, her ATK stacks stay high, and her Basic ATK's Burn is one more DoT for Black Swan's Arcana.

Free Break team

March 7th (The Hunt)
Trailblazer (Harmony)
Asta
Gallagher

Accessible Break team: her Skill bounces add Toughness damage, and Watchmaker on her Ultimate boosts everyone's Break Effect.

Guide

How to play

How she works

  • Astrometry (Talent). Asta gains 1 Charging stack for each different enemy she hits, plus 1 if that enemy is weak to Fire. Each stack gives all allies +14% ATK (up to 5 stacks, so +70%). From her second turn on, she loses 3 stacks at the start of each of her turns.
  • Meteor Storm (Skill). 50% ATK on the target, then 4 bounces of 50% ATK on random enemies (5 at E1): her main way to build Charging, with strong Toughness damage for a support.
  • Astral Blessing (Ultimate, 120 Energy). +50 SPD for all allies for 2 turns.
  • Traces. Ignite (A4): +18% Fire DMG for all allies while she's on the field. Sparks (A2): her Basic ATK can Burn enemies, one more debuff for debuff-based teams. Constellation (A6): +6% DEF per Charging stack.

Rotation

  1. Open with her Technique (an AoE hit at the start of battle), then her Skill to build Charging stacks.
  2. Alternate Skill and Basic ATK depending on your Skill Points: even an SP-positive Asta keeps 1–2 stacks.
  3. Time her Ultimate right before your key characters act. Turning on "Display Action Values" in the settings helps, and casting it during an ally's turn before they act effectively gives them an extra turn of the SPD buff.

Tips

  • None of her buffs scale with her stats: build her for SPD, Energy and survivability.
  • E2 and E4 are her key Eidolons, and they're realistic for a 4★.
  • With Silver Wolf LV.999, her flat +50 SPD becomes Elation through Silver Wolf's A2 (+2% Elation per SPD point above 160), and Dance! Dance! Dance! adds a team-wide action advance on each Ultimate.
  • In mono-Fire teams, her A4 adds 18% Fire DMG for everyone.

Strengths

  • Universal support: team-wide ATK and SPD
  • A massive +50 SPD for the whole team
  • Strong Toughness damage for a support
  • Supports dual-DPS teams well
  • New niche in Silver Wolf LV.999 Elation teams

Weaknesses

  • Charging stacks depend on random bounces
  • Keeping stacks high costs Skill Points
  • Outclassed by 5★ amplifiers in most teams
  • Her Ultimate needs careful timing

Notable dupes · Eidolon

E1
Solid upgrade

One extra Skill bounce: more Charging stacks and Toughness damage.

E2
Big upgrade

After her Ultimate, she doesn't lose Charging stacks on her next turn, so her buffs line up for burst windows.

E4
Big upgrade

+15% Energy Regeneration Rate with 2+ Charging stacks — Prydwen's most impactful Eidolon for her.

E5
Solid upgrade

Ultimate level +2: +52.8 SPD instead of +50 (Prydwen rounds it to 53).

E6
Solid upgrade

She loses 1 fewer Charging stack each turn.

Community

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Updated September 25, 2026 · Version 4.5
Sources & references
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