Ultimate Castorice Guide — Relics, Cones & Pro Tips for Peak Performance

HSR Castorice Build Guide: Light Cones, Relics, Teams & More

Castorice is a 5★ Quantum character on the Path of Remembrance in Honkai: Star Rail. She revolves around summoning her memosprite, Pollux, and manipulating team HP to fuel massive Quantum damage and powerful debuffs.

Unlike traditional DPS units, Castorice scales heavily with Max HP, converts healing into resources, and applies meaningful All-Type RES reduction. Played correctly, she functions as a hybrid hypercarry and debuff enabler — but she requires careful team construction to maximize her HP-based mechanics.

This guide covers her best Light Cones, relics, planar ornaments, trace priority, and ideal team setups.

Castorice Overview

Rarity: 5★
Element: Quantum
Path: Remembrance
Role: HP-scaling DPS / Debuff Enabler

Core Mechanics

1. Pollux (Memosprite Summon)
Her Ultimate summons Pollux, who:

• Deals Quantum damage

• Applies strong debuffs

• Reduces enemy All-Type RES

• Synergizes with HP-based mechanics

2. HP Manipulation System
Castorice consumes ally HP to:

• Fuel AoE Quantum attacks

• Empower her damage

• Trigger resource generation

This means she must be paired with a strong healer to prevent team collapse.

3. HP Scaling

• Her abilities scale with Max HP

• HP investment increases both survivability and damage output

She thrives in coordinated hypercarry comps where HP manipulation is controlled rather than chaotic.

Trace Priority

Always unlock Major Traces first before heavy talent investment.

Major Traces

Major Trace 1 – Contained Dark Tide

• Converts healing received by allies into “Newbud” resource.

• Healing just before Castorice’s turn maximizes resource gain.

• When Netherwing is active, healing restores Netherwing instead.

Optimization Tip:
Time your healer’s action right before Castorice’s turn to maximize Newbud conversion.

Major Trace 2 – Inverted Torch

• If Castorice HP ≥ 50%, she gains +40% SPD

• If Pollux secures lethal damage, it gains +100% SPD for 1 turn

This trace makes maintaining HP above 50% extremely important.

Major Trace 3 – Where the West Wind Dwells

• Boosts Pollux’s Breath Scorches the Shadow damage

• Stacks up to 6 times in one turn

Encourages aggressive Pollux skill cycling.

Talent Upgrade Priority

Memosprite Skill > Memosprite Talent > Ultimate > Skill > Talent > Basic ATK

Most of her value comes from Pollux.

Best Light Cones

Best-in-Slot

Make Farewells More Beautiful (5★)

Why it’s perfect:

• +30% Max HP (huge scaling boost)

• DEF ignore when losing HP

• Action advance when memosprite disappears

This LC directly synergizes with:

• HP loss mechanics

• DEF shred stacking

• Turn cycling

Best overall option for peak performance.

Strong Alternatives

To Evernight’s Stars

• HP increase

• DEF ignore for memosprites

• Energy recovery when memosprite disappears

Excellent synergy-focused alternative.

The Flower Remembers

• High CRIT DMG boost

• Also boosts memosprite CRIT DMG

Simple but powerful damage option.

Sweat Now, Cry Less

• Teamwide DMG boost when memosprite acts

• Budget-friendly support-damage hybrid

Best Relics

Best Set: Poet of Mourning Collapse

2-Pc: +10% Quantum DMG
4-Pc: -8% SPD but massive CRIT Rate if SPD is below threshold

Why it works:

• Castorice benefits from lower SPD thresholds

• CRIT Rate bonus applies to her AND her memosprite

• Strong synergy with HP-based scaling builds

This set maximizes her damage ceiling.

Best Planar Ornaments

Bone Collection’s Serene Demense (Best)

2-Pc: +12% Max HP
If Max HP ≥ 5000:

• +28% CRIT DMG for wearer and memosprite

This is tailor-made for Castorice’s HP scaling.

Stat Priority

Main Stats

• Body: CRIT DMG

• Feet: HP%

• Sphere: Quantum DMG% or HP%

• Rope: HP%

Substats

CRIT Rate / CRIT DMG > HP% > Flat HP > SPD (situational)

Because:

• Her relic + traces help CRIT Rate

• HP directly increases damage

• SPD management depends on trace thresholds

Best Team Compositions

Castorice works best in hypercarry setups where she is the main DPS supported by debuff stacking and sustain.

Core Structure

Main DPS: Castorice
Support 1: Tribbie / Remembrance MC / Sunday / Pela
Support 2: One of the above
Sustain: Gallagher or Luocha

Why These Supports Work

Tribbie

• Increases All-Type RES PEN

• Increases enemy damage taken

• Amplifies overall team damage ceiling

Remembrance Trailblazer (RMC)

• Provides True DMG boosts

• Action Advance synergy

• Strong memosprite interaction

Sunday

• CRIT DMG boosts

• Action Advance for Castorice and Pollux

Pela

• DEF shred

• SP positive

• Easy synergy with RES reduction stacking

Sustain Choices

Gallagher

• Strong healing

• SP-efficient

• Reliable HP management

Luocha

• Automatic healing

• Extremely comfortable sustain

• Helps maintain ≥50% HP for SPD trace

A strong healer is mandatory due to HP consumption mechanics.

Playstyle Tips

• Time healing before Castorice’s turn.

• Keep her HP above 50% whenever possible.

• Stack HP aggressively — it scales damage.

• Manage memosprite uptime carefully.

• Avoid overbuilding SPD if it breaks relic bonuses.

She rewards strategic rotation planning more than raw button spam.

Final Thoughts

Castorice is a high-skill, high-reward 5★ Quantum Remembrance DPS who leverages HP manipulation and memosprite synergy to dominate the battlefield. With the right HP stacking, DEF shred layering, and strong sustain support, she becomes a powerful hypercarry capable of shredding enemy RES while maintaining strong personal damage.

Her ceiling is high but only if you build around her mechanics correctly.

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