Hyacine is a 5-star Wind character following the Path of Remembrance in Honkai: Star Rail, introduced as a specialized sustain unit who excels in HP-scaling teams. Unlike traditional Abundance characters, Hyacine utilizes her Memosprite, "Little Ica," to provide consistent healing, debuff removal, and massive HP buffs to the entire party. Her kit is uniquely designed to reward extremely high speed, making her one of the fastest and most proactive healers in the current meta.

For players looking to optimize Hyacine, the focus must be on hitting specific stat thresholds—most notably the 200 Speed mark—to fully activate her potent "Tempestuous Halt" trace. This guide breaks down the best relics, light cones, and team synergies to maximize her effectiveness as a premier sustain.

Core Stat Priorities and Benchmarks

Hyacine’s healing and sub-DPS output scale directly with her Max HP. However, her utility is tied to her "After Rain" state and her Speed. To maximize her potential, players should target the following stats:

  • Primary Stat: Speed (SPD) – Aim for 200+ in combat.
  • Secondary Stat: Max HP% – Aim for 5,000 to 6,000+.
  • Utility Stat: Energy Regeneration Rate (ERR) – Critical for Ultimate uptime.
  • Support Stat: Effect Resistance (RES) – Essential to prevent crowd control from disrupting her rotation.

The 200 Speed requirement is not just a suggestion; it is the cornerstone of her advanced build. Reaching this number triggers her "Tempestuous Halt" bonus ability, which significantly increases her Max HP and Outgoing Healing based on every point of speed exceeding 200.

Best Light Cones for Hyacine

Light Cones for the Path of Remembrance are diverse, but for a sustain-focused Hyacine, options that provide speed or HP are paramount.

Signature Light Cone: Long May Rainbows Adorn the Sky

This is the undisputed best-in-slot option. It provides a massive 18% to 30% Speed boost (at S1-S5), which drastically lowers the relic sub-stat requirements needed to reach the 200 SPD threshold. Furthermore, it allows Hyacine to consume a small portion of allies' HP to empower Little Ica's attacks, creating a synergistic loop with HP-scaling DPS units like Blade or Castorice. The 18% damage vulnerability it applies to enemies further cements Hyacine's role as a hybrid support-sustain.

F2P Alternative: Memory's Curtain Never Falls

Available through Herta’s Shop, this 5-star Light Cone is the best free-to-play choice. At S5, it offers a 12% Speed increase and boosts team-wide damage after Hyacine uses her skill. While it lacks the raw HP-manipulation power of her signature, the speed boost is vital for hitting her breakpoints.

4-Star Options: The Story's Next Page

If the 5-star options are unavailable, "The Story's Next Page" provides a reliable increase to Max HP and Outgoing Healing. It is a solid "pure healing" choice, though players will find it much harder to reach the 200 SPD mark without the speed bonuses provided by the higher-tier cones.

Relic and Planar Ornament Selection

The choice of relics is what separates a basic Hyacine build from an elite one. Every piece must contribute to either her speed or her sustainability.

Best Cavern Relics: Warrior Goddess of Sun and Thunder (4-Piece)

This set was practically designed for Hyacine. The 2-piece effect provides a speed boost, while the 4-piece set increases the party's Crit DMG when the wearer heals an ally. Given that Hyacine and Little Ica provide frequent, multi-target healing, the uptime on this Crit DMG buff is nearly 100%.

  • Alternative: 2-Piece Messenger Traversing Hackerspace + 2-Piece Sacerdos' Relived Ordeal. This combination is easier to farm and provides a consistent 12% total Speed increase, which can be helpful if you are struggling with SPD sub-stats.

Best Planar Ornaments: Giant Tree of Rapt Brooding

This set is the go-to for HP-based supports. It grants a baseline HP increase and further boosts the wearer's Outgoing Healing. Most importantly, it provides a team-wide ATK or Crit buff (depending on specific requirements) that synergizes well with Hyacine's high-turn frequency.

  • Alternative: Broken Keel. If your team relies heavily on Crit DMG, the 10% team-wide buff from Broken Keel is always valuable, provided you reach the 30% Effect RES requirement.

Recommended Main Stats and Sub-stats

When farming relics, prioritize the following main stats to ensure Hyacine fulfills her role:

Relic Piece Main Stat
Body Outgoing Healing Boost
Feet Speed (Non-negotiable)
Planar Sphere HP%
Link Rope Energy Regeneration Rate

Sub-stat Priority:

  1. Speed: Until 200+ (In-combat).
  2. HP%: For scaling heals and survivability.
  3. Effect RES: To maintain control over the battle.
  4. Flat HP: To further boost the scaling pool.

Understanding Hyacine's Kit and Rotation

To play Hyacine effectively, you must manage her "After Rain" state, which is triggered by her Ultimate, "We Who Fly Into Twilight."

The Role of Little Ica

Little Ica is Hyacine’s Memosprite. It acts as an independent entity on the action bar but its efficacy is tied to Hyacine’s stats. While Hyacine is in the "After Rain" state, Little Ica gains an extra turn and automatically attacks whenever Hyacine uses an ability. This means that a high-speed Hyacine results in a high-frequency Little Ica.

Healing Logic

Hyacine provides a mix of proactive and reactive healing. Her Skill, "Love Over the Rainbow," heals all allies and summons/refreshes Little Ica. However, her Talent, "First Light Heals the World," allows Little Ica to provide micro-heals whenever an ally’s HP is reduced. This makes her exceptionally strong against enemies that deal damage over time (DoT) or in teams where the DPS consumes their own HP.

Skill Rotation

The optimal rotation usually follows a Skill -> Basic -> Basic or Skill -> Basic pattern, depending on Energy needs. Because her Ultimate provides the critical "After Rain" buff (which increases team Max HP by 15%+), maintaining high Ultimate uptime via an Energy Regeneration rope and frequent turns is more important than spamming her Skill every turn.

How to Reach 200 Speed: The Math

Reaching 200 Speed is a daunting task but achievable with the right setup. Here is how the numbers break down:

  1. Base Speed: 110.
  2. Traces: +14 SPD (fully leveled).
  3. Speed Boots: +25 SPD.
  4. Relic Set (2-pc or 4-pc): +6% to +12% of Base SPD (~6.6 to 13.2 SPD).
  5. Light Cone (S1 Signature): +18% SPD (~19.8 SPD).
  6. Sub-stats: You will need approximately 20-30 additional Speed from sub-stats across your six relic pieces.

In our testing, achieving 200 Speed allows Hyacine to act three times in the first cycle of Memory of Chaos, providing unparalleled skill point generation and emergency healing. If you can exceed 200, her "Tempestuous Halt" trace begins to convert every point of excess speed into Outgoing Healing, effectively making her a better healer the faster she gets.

Best Team Compositions

Hyacine is a versatile sustain, but she shines brightest when paired with characters who benefit from her Max HP buffs and frequent healing.

The HP-Scaling Powerhouse: Castorice and Blade

Hyacine is the premier sustain for Castorice. Castorice generates "New Buds" based on HP consumption and recovery; Hyacine’s frequent, multi-target heals and HP-cap increases directly accelerate Castorice’s damage ramp-up. Similarly, Blade benefits immensely from the increased Max HP pool, as his damage scales almost entirely off his health.

  • Team: Hyacine (Sustain) + Castorice (Main DPS) + Evernight (Support) + Cyrene (Support).

The Remembrance Synergy: Memosprite Focus

Because Hyacine is a Remembrance character, she shares synergy with the Remembrance Trailblazer. This team focuses on "True Damage" and Memosprite coordination.

  • Team: Hyacine (Sustain) + Remembrance Trailblazer (Sub-DPS/Support) + Pela (Debuffer) + Any Wind/Ice DPS.

Generalist Sustain: Acheron or Feixiao

Even in teams that don't scale with HP, Hyacine is valuable. If equipped with her signature Light Cone, her Memosprite attacks count as debuff applications, which helps Acheron build "Slashed Dream" stacks faster. For Feixiao, Little Ica's frequent off-turn attacks help generate stacks for her ultimate.

Is Hyacine Worth the Investment?

Hyacine represents a shift in HSR's sustain meta. While characters like Aventurine provide shields and Huohuo provides Energy, Hyacine provides raw survivability through HP pool expansion.

Pros:

  • Incredible synergy with current and future HP-scaling units.
  • High speed leads to excellent Skill Point (SP) economy.
  • AOE cleanse on Skill and Ultimate.
  • Provides sub-DPS through her Memosprite.

Cons:

  • High gear floor (Speed requirements are difficult for newer players).
  • Heavily reliant on her signature Light Cone or high-superimposition F2P options.
  • No "Emergency Burst Heal" outside of her Ultimate.

Summary

Hyacine is a transformative sustain unit for Honkai: Star Rail players who enjoy high-speed, technical gameplay. By focusing on a build that hits the 200 SPD threshold and maximizes her HP scaling, you unlock a character capable of keeping even the squishiest teams alive while significantly boosting the damage of HP-centric carries like Castorice and Blade. Prioritize the "Warrior Goddess" relic set, aim for an Energy Regeneration rope, and ensure your Speed sub-stats are optimized to see her true potential.

FAQ

What is the minimum Speed for Hyacine if I can't reach 200?

While 200 is the goal for her "Tempestuous Halt" trace, a "budget" build should still aim for 160 SPD. This allows her to hit the standard high-speed breakpoint for most endgame content, though you will miss out on the bonus healing scaling.

Does Hyacine work with Robin or Ruan Mei?

Yes. Ruan Mei’s speed buff helps Hyacine reach her 200 SPD requirement more easily. Robin’s Action Advance is less critical for Hyacine than for other characters because Hyacine is already so fast, but the damage buffs still apply to Little Ica.

Can I use Abundance Light Cones on Hyacine?

No. Hyacine follows the Path of Remembrance. She cannot use Abundance Light Cones. You must use Remembrance-specific Light Cones.

How much HP is "too much" for Hyacine?

There is no hard cap, but after 6,500 HP, the diminishing returns on healing usually mean you should have invested more into Speed or Effect RES.

Why does Little Ica have 0 Speed?

Little Ica does not take traditional turns on the action bar. It reacts to Hyacine’s actions and ally HP changes. This is why boosting Hyacine’s speed is the only way to increase Little Ica’s frequency of action.