4-Star
Fire
The Harmony
A Tier
Fire
The HarmonyA universally applicable Harmony support specialising in boosting the whole team's ATK and SPD. Asta's Ultimate grants a massive flat +50 Speed to all allies for 2 turns, while her Charging stacks provide up to 70% ATK boost, making her one of the most versatile 4-star supports in the game.
Asta
Lead Researcher / Herta Space StationBest Light Cone
Dance! Dance! Dance!
Best Relic Set
Messenger 4pc
Planar Set
Sprightly Vonwacq
SPD Breakpoint
134 / 143+
Best Partner
Skills
Basic
Spectrum Beam
Deals Fire DMG equal to 100% of Asta's ATK to a single enemy. Has an 80% base chance to Burn the target for 3 turns (via the Sparks A2 trace), making them take Fire DoT equal to 50% of Basic ATK DMG each turn. Keeps Charging stacks alive while remaining SP-positive.
100%
of ATK
Skill
Meteor Storm
Deals Fire DMG equal to 50% of Asta's ATK to a single enemy, then Bounces 4 additional times, each hit dealing 50% ATK to a random enemy. Total multiplier reaches 250% ATK against a single target. Each different enemy hit grants 1 Charging stack, plus an extra stack if the enemy has Fire Weakness. Deals exceptional Toughness damage for a support (90 total across 5 hits).
250%
total ATK
Ultimate
Astral Blessing
Increases SPD of all allies by 50 for 2 turns. Costs 120 Energy. An extraordinary teamwide Speed boost. A flat +50 SPD is enormous for every character and can push some builds past the double-turn threshold above 200 SPD. Timing matters: use when characters have higher Action Values (larger numbers shown) to maximize the forward push.
+50
SPD all allies
Talent
Astrometry
Gains 1 Charging stack for every different enemy hit, plus 1 extra stack if the enemy has Fire Weakness. Each stack increases all allies' ATK by 14%, up to 5 stacks (maximum 70% ATK). Starting from her second turn, Charging stacks decrease by 3 at the start of each turn. Even against a single enemy without Fire Weakness, Asta maintains at least 14% ATK permanently.
70%
max ATK boost
Technique
Miracle Flash
Immediately attacks the enemy. After entering battle, deals Fire DMG equal to 50% of Asta's ATK to all enemies. A useful tool to open combat with a multi-target hit, potentially granting Charging stacks from the very start of a fight.
50%
AoE entry hit
Build Targets
Relic Main Stats
Head
HP (fixed)
Hands
ATK (fixed)
Body
HP%
or DEF%
Feet
Speed
Planar Sphere
Fire DMG%
or HP%
Link Rope
Energy Regen
Stat Targets
Substat Priority
01
SPD
until breakpoint
02
HP%
survivability
03
DEF%
survivability
04
Effect RES%
30% for Keel
Skill Upgrade Order
Talent
1st
Ult
1st
Skill
2nd
Basic
Last
Talent and Ultimate are equally important: Talent governs the ATK% buff while Ultimate provides the Speed boost. Skill third for extra Charging stacks. Basic ATK is last priority.
Best Light Cones
#1
Dance! Dance! Dance! (S5)
Best-in-slot for team-wide action advance. When the wearer uses their Ultimate, all allies' actions are Advanced Forward by 24% at max superimposition. Strongest on characters who can access their Ultimate at least once every 2–3 actions. Asta qualifies easily with Energy Regen substats.
#2
Meshing Cogs (S5)
One of the strongest energy-generating cones in the game. After using attacks or getting hit, regenerates up to 8 Energy per turn. Especially potent in fights where Asta is being hit frequently. Trades team advance for raw Ultimate access, which can be valuable for consistent SPD buff uptime.
#3
But the Battle Isn't Over
5-star option providing Energy Regen and SP regeneration on Ultimate use. The 30–50% DMG bonus granted to the next ally acting after Asta's Skill is a significant buff for your damage dealer. Best used when Asta consistently acts before her carry.
#4
Planetary Rendezvous (S5)
Specialist option for Fire-element teams. Upon battle entry, allies of the same element gain up to 24% increased DMG. Works well in mono-Fire compositions or alongside Himeko, but falls behind against mixed-element teams.
Best Relics
Cavern Sets
1
Messenger Traversing Hackerspace (4pc)
Her best-in-slot cavern set. The 2-piece grants +6% SPD. The 4-piece triggers when Asta uses her Ultimate on an ally, increasing all allies' SPD by 12% for 1 turn. Combined with the Ultimate's flat +50 SPD, this creates an exceptional teamwide Speed window. Time it carefully to ensure the buff is active on key members for their most important actions.
2
+
Messenger (2pc) + Flex (2pc)
Mix-and-match alternative using the Messenger 2-piece bonus (+6% SPD) alongside two pieces from other sets for their 2-piece bonuses. Flexible options include Sacerdos' Relived Ordeal, Diviner of Distant Reach, or Warrior Goddess of Sun and Thunder depending on team needs.
3
Eagle of Twilight Line (4pc)
Specialist alternative. The 4-piece advances Asta's own action forward by 25% after using her Ultimate, letting her take more turns and apply her buffs more frequently. Best used when Asta needs to reach her Ultimate rotation faster or stack more Charging turns.
4
Watchmaker, Master of Dream Machinations (4pc)
Break-focused option only. When Asta uses her Ultimate on an ally, all allies' Break Effect increases by 30% for 2 turns. Only relevant in Break-focused team compositions. Skip this set unless your team specifically revolves around Break damage.
Planar Ornament Sets
1
Sprightly Vonwacq
Best planar set for Asta. Provides +5% Energy Regen Rate and, when SPD reaches 120 or higher, advances Asta's action forward by 40% immediately upon entering battle. This lets Asta apply her buffs before the rest of the team acts, accelerating rotations and granting earlier Ultimate access from the very first wave.
2
Fleet of the Ageless
Solid alternative. Provides +12% Max HP and, when SPD reaches 120+, increases all allies' ATK by 8%. Stacks additively with Asta's Charging ATK buff, providing a free team-wide ATK boost simply by meeting the Speed threshold. Ideal when supporting ATK-scaling damage dealers.
3
Broken Keel
Good team CRIT DMG option. Provides +10% Effect RES to Asta and, when her Effect RES reaches 30% or higher, all allies gain +10% CRIT DMG. Requires investing in Effect RES substats to activate, but the CRIT DMG bonus is a strong passive buff for any CRIT-scaling carry.
4
Penacony, Land of the Dreams
Fire-element team option. Provides +5% Energy Regen and increases DMG for all other allies of the same element (Fire) by 10%. Best in mono-Fire teams. Falls behind the other options in mixed-element compositions.
Best Teams for Asta
Asta is a universal support who fits into nearly any team needing ATK and SPD buffs. She excels most in DoT teams where Kafka benefits from both her Speed boost and ATK amplification, and her frequent Basic Attacks enable Kafka's Follow-Up Attacks.
01 · Kafka DoT
Best Asta synergy team
Kafka benefits massively from Asta's constant ATK% boost and Speed buff, stacking more Arcana between actions. Asta's frequent Basic Attacks also trigger Kafka's Follow-Up. Black Swan applies Burn via Arcana when Asta Basic Attacks, creating additional DoT stacking synergy. Gallagher is an accessible sustain option who also applies Weaken.
02 · Kafka + Black Swan
Asta as speed/ATK enabler
Black Swan can utilize Asta's Speed buff to stack more Arcana between enemy actions. Asta's Basic Attack applies Burn, which Black Swan can convert into extra Arcana stacks. Huohuo provides energy regeneration and healing for the entire team.
03 · General Support
Versatile ATK + SPD buffing
Asta's A4 trace grants an extra 18% Fire DMG to all allies while she is on the field, giving Himeko a free multiplicative boost. Asta also maintains high Charging stacks easily by hitting multiple enemies with her Skill Bounce. Good F2P-accessible team.
04 · F2P · Budget
All accessible characters
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Eidolons
E
1
Star Sings Sans Verses or Vocals
When using Skill, deals DMG for 1 extra time to a random enemy. Increases total Skill multiplier to 300% ATK, Toughness damage to 105, and provides an extra chance to gain additional Charging stacks each Skill use.
Good Upgrade
E
2
Moon Speaks in Wax and Wane
After using her Ultimate, Asta's Charging stacks will not be reduced in the next turn. A very significant milestone. Delays Charging stack decay for one full turn after the Ultimate, allowing her to maintain higher stacks for longer without spending additional SP, and lines up her full buff window for bigger damage bursts.
Key Milestone
E
3
Meteor Showers for Wish and Want
Skill Lv. +2 (max 15) and Talent Lv. +2 (max 15). Increases the ATK boost per Charging stack to 15.4% per stack at max level, raising the maximum team ATK boost to 77%. A meaningful improvement to her core support output.
Solid Upgrade
E
4
Aurora Basks in Beauty and Bliss
Asta's Energy Regeneration Rate increases by +15% when she has 2 or more Charging stacks. Since maintaining 2+ stacks is trivial in most fights, this effectively grants permanent +15% Energy Regen, which can enable permanent Ultimate uptime with certain builds. Her most impactful Eidolon for consistency.
Most Impactful
E
5
Nebula Secludes in Cold Cosmos
Ultimate Lv. +2 (max 15) and Basic ATK Lv. +1 (max 10). Improves the Ultimate's SPD boost to a flat +53 instead of +50. Even 3 extra SPD can be significant for certain breakpoints, making this a worthwhile upgrade despite being a level-type Eidolon.
Incremental
E
6
Galaxy Dreams in Calm and Comfort
Charging stack(s) lost each turn is reduced by 1 (from 3 to 2). This comfort Eidolon makes Charging maintenance significantly easier, allowing Asta to run SP-positive strategies more reliably and spend fewer turns Skill-using to keep stacks at maximum.
Quality of Life
Major Traces
Sparks
Ascension 2
Asta's Basic ATK has an 80% base chance to Burn enemies for 3 turns, making the enemy take Fire DoT equal to 50% of Asta's Basic ATK DMG at the start of each turn. A source of the Burn debuff that synergizes with Guinaifen's Firekiss and Black Swan's Arcana stacking.
Ignite
Ascension 4
When Asta is on the field, all allies' Fire DMG increases by 18%. A free and permanent multiplicative boost for Fire-element damage dealers in your team. Particularly strong in Fire-heavy compositions with Himeko, Kafka, or other Fire carries.
Constellation
Ascension 6
Asta's DEF increases by 6% per current Charging stack she possesses, up to a potential +30% DEF at maximum 5 stacks. A passive survivability boost that scales naturally with her gameplay loop of maintaining high Charging stacks.
+22.4%
Fire DMG
+22.5%
DEF
+6.7%
CRIT Rate
Upgrade Materials
Endotherm Chitin
Character Ascension
Silvermane Badge / Insignia / Medal
Trace Material
Harmonic Tune
Trace Material
Destroyer's Final Road
Weekly Boss Drop
Frequently Asked Questions
Yes, especially for newer players or those without limited 5-star Harmony units like Ruan Mei or Sparkle. Asta is one of the most versatile 4-star supports in the game. Her kit works in virtually every team and her Speed boost is always appreciated. Once you obtain stronger limited Harmony units, she becomes a reliable second-team support or budget option.
Each Charging stack increases the entire team's ATK by 14% (up to 5 stacks = 70% ATK at base). You gain 1 stack for every different enemy hit by Asta's Skill Bounce, plus 1 extra stack if the enemy has Fire Weakness. Starting from her second turn in a fight, 3 stacks are lost at the beginning of each of her turns. Even against a single enemy with no Fire Weakness, you maintain at least 14% permanently by Basic Attacking or Skill-ing each turn.
The recommended breakpoints are 134 SPD (allows Asta to take 4 turns in a standard 3-cycle window) and 143 SPD (a higher-efficiency breakpoint for some team compositions). Going above 160 SPD is also viable if you want Asta to act very frequently and maintain more Charging stack uptime. Sprightly Vonwacq's action advance requires only 120 SPD to activate and is easy to hit.
Enable "Display Action Values" in settings. The larger the Action Value number shown for a character in the turn order, the more they benefit from a Speed boost (the boost pushes their turn up more). Use Asta's Ultimate when your damage dealers have higher Action Values, pushing them further up the queue. There is also a mechanic where using Ultimate on a character's turn before they act grants them an effective extra turn of the Speed boost as a safety measure.
Ruan Mei is stronger overall for most teams, providing a more consistent SPD bonus, Break Effect, and DMG% amplification through her passive and Ultimate. However, Asta has her own advantages: she provides a larger flat SPD burst via Ultimate (enabling double-turn territory above 200 SPD), offers stronger Break damage for a support, and excels in Dual Carry setups. As a free 4-star, Asta is an excellent choice until you can pull a limited Harmony 5-star.
E2 and E4 are the most impactful. E2 prevents Charging stack decay the turn after using the Ultimate, significantly improving Asta's buff uptime and SP efficiency. E4 grants +15% Energy Regen when at 2+ Charging stacks, which is near-permanent and can enable consistent Ultimate uptime. Since Asta is a 4-star available from the Stellar Warp pool, her Eidolons are relatively accessible over time. E0 is already strong and fully functional for all content.
