Honkai: Star Rail Castorice Build Guide: Relics, Light Cones, Teams & More

Looking to make the most of Castorice in Version 3.7? With her rerun alongside Hyacine and Tribbie, now is a great time to pull her or upgrade her as your main Quantum AoE DPS. Castorice shines as the 5★ Remembrance path’s goddess of death, turning ally HP into massive area damage. Her kit can hit over 1 million AoE damage per cycle when properly invested, so she is the one for high-risk, high-reward gameplay. and today, this Honkai: Star Rail Castorice build guide walks you through her kit, stat priorities, Eidolon breakpoints, and team setups to advance her to the top.

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Why Castorice Stands Out?

Castorice builds her power by draining your team’s HP. Her Newbud resource fills whenever allies lose HP, allowing her to summon the Netherwing for chained Quantum attacks. Even off-field, she has a global passive that acts as a pseudo-revive. If an ally would fall, they instead enter a cocooned state, delaying death until they are healed or shielded. This is especially clutch during boss fights.

Castorice Kit Overview

To have a proper Honkai: Star Rail Castorice build, knowing what she can do with her kit packed with effects is a must. So, here is how her kit works with the key abilities on level 10 values:

• Basic Attack: Lament, Nethersea’s Ripple – Deals single-target Quantum damage equal to 100% of her ATK. This is mainly for energy generation, so use it when you need SP quickly.
• Skill: Silence, Wraithfly’s Caress – This costs 0 SP and will drain 30% of all allies’ current HP (minimum 1 HP). It can also deal 150% of Castorice’s Max HP as Quantum damage to one enemy, plus 75% splash to nearby foes
• Ultimate: Doomshriek, Dawn’s Chime (Energy: 120) – When you reach max Newbud, Castorice calls forth Netherwing, a powerful summon whose health matches your current Newbud value. It immediately takes action once summoned and creates a field called Lost Netherland for 3 turns. While this field is active, all enemies lose 20% of their resistance to every damage type. Netherwing also carries all the buffs that Castorice currently has, making it a strong extension of your power.
• Talent: Desolation Across Palms – Every time your allies lose HP, Castorice gains Newbud. When Netherwing is on the field, that HP loss is converted into healing for it instead, which helps keep it active longer. The moment Netherwing appears, your whole team gains 10% extra damage for 3 turns, giving you a solid boost in combat.
• Technique: Wail, Death’s Herald – Enter Netherveil (20s): When you use this skill, Castorice enters Netherveil for 20 seconds. During this time, enemies cannot get close to you. Once a battle starts, Netherwing is summoned with 50% HP, and your team loses 40% of their health to power the summon. If summoning Netherwing is not possible, you instead gain 30% more Newbud instantly.

Netherwing Breakdown

Netherwing is Castorice’s memosprite that acts on its own once summoned. With a high speed (base 134), it can hit hard while giving you utility in battles. Here’s how each of its abilities works and what you should know to make the most of it.

1. Basic Attack: Claw Splits the Veil: This move deals area Quantum damage to all enemies, equal to 100% of Netherwing’s Max HP.
2. Skill: Breath Scorches the Shadow: When using this skill, Netherwing sacrifices 25% of its own HP to unleash repeated area Quantum attacks. The first hit deals damage equal to 150% of its Max HP, and each repeat adds 10% more, up to five times total. These hits happen continuously without ending its turn. If Netherwing’s HP falls to 25% or below, it will stay alive at 1 HP and then explode, dealing heavy damage before disappearing.
3. Vanish: Wings Sweep the Ruins: When Netherwing vanishes, it strikes six random enemies with single-target Quantum attacks, each dealing damage equal to 100% of its Max HP. After the attacks, the whole team is healed by 10% of their Max HP plus an extra 1,000 flat healing.
4. Passive: Mooncocoon Shrouds the Form: This passive allows Netherwing to protect your team by taking a fatal hit on their behalf, absorbing damage at 500% efficiency.

Netherwing’s skills don’t consume Skill Points, and its resistance reduction makes it excellent for clearing waves of enemies. However, you’ll need strong Abundance-type healers to keep it alive since its abilities drain its own HP. These healers also help convert that HP loss into extra Newbud through Castorice’s A2 trace.

Optimal Light Cones: Focus on HP and DEF Ignore

Remembrance Light Cones are short in supply, so prioritize high-base-HP options for Honkai Star Rail Castorice build. Her signature dominates for consistent DEF ignore on drains and these are the top light cones to be equipped with:

Light Cone	Source	Key Effects (S1)	Best For
Make Farewells More Beautiful (Signature)5 Star	Limited Banner	+30% Max HP; On HP loss (self/memosprite): Ignore 30% enemy DEF (2 turns); +24% action advance on vanish	BiS: Enables 1-turn Ult recycles with strong healers.
Sweat Now, Cry Less4 Star	Battle Pass	+16–32% CRIT DMG (self + memosprite)	F2P meta: CRIT inheritance without sig pulls. S5 caps 200%+ DMG.
The Flower Remembers4 Star	Battle Pass	+24–48% CRIT DMG to memosprites	Budget burst: Pairs with E0 for Netherwing focus.
Victory in a Blink4 Star	Standard Warp	+12–24% action advance on kills	Superimpose alternative: QOL for multi-wave PF.
Flames Afar (F2P Stat Stick)4 Star	Standard Warp	1,058 base HP; +12–24% Break Effect	Entry-level: Pure HP scaling if no Remembrance options.

Castorice Relics, Planar Ornaments, and Eidolon Guide

To get the most out of Castorice, you want her stats and equipment tuned for maximum AoE damage. Hitting 7,000–8,500 Max HP will let you burst 1.5M+ per cycle, while 85–100% CRIT Rate and 180–220% CRIT DMG optimize her nukes. Keep base speed below 95 to activate full set bonuses, though substats can push it to 100 if needed.

And these are what we recommend to you:

Relic Sets	Planar Ornaments	Main Stats & Substats
4-Piece BiS: Poet of Mourning CollapseIncreases Quantum damage by 10%Pre-battle SPD under 110 grants +32% CRIT Rate for Castorice and NetherwingBest for F2P players aiming for consistent critical hits	BiS 2-Piece: Bone Collection’s Serene Demesne+12% Max HPIf HP ≥ 5,000, grants +28% CRIT DMG for Castorice and Netherwing	Main StatsHead/Hands: HP% or HP FlatBody: CRIT DMG% preferred, else HP%Feet: HP%Planar Sphere: prioritize HP% over Quantum damageLink Rope: HP%
2-Piece Early-Game OptionCombine Poet of Mourning Collapse with Genius of Brilliant Stars for +10% Quantum damageGood choice if you’re building early or don’t have full 4-piece sets	Alternative 2-Piece: Arcadia of Woven Dreams+5% damage per Remembrance ally or memosprite (max 15% with 2+ units)	Substats PriorityCRIT Rate% > CRIT DMG% > HP% > Effect RES (for survival) > SPD (cap at 100)

Farming and Traces

For farming and traces with Castorice. These are the ideal setups:

• Farm Cavern of Corrosion: Bud of Reminiscence for Poet relic pieces
• Trace Leveling Priority: focus on Netherwing first to maximize chain damage
• Trace Upgrade Order: Netherwing Skill (Breath ramping), Netherwing Talent (Explosion + heals), Ultimate (Summon + RES shred)

Eidolon for Castorice

Castorice works well at E0S1, but her power spikes at E2, doubling Breath uptime for 40%+ DPS gains.

So, the ideal Eidolons for her are:

• E1: Snowbound Maiden – +20–40% damage vs enemies ≤50% HP
• E2: Crown on Wings of Bloom – Adds 2 Ardent Will charges for extra Breaths; Skill gets +100% action advance and +30% Newbud gain (Core power spike)
• E4: Await for Years to Loom – +20% incoming healing; Netherwing ignores one weakness type
• E6: And Waits for Time to Un-Cocoon – +20% Quantum RES PEN; Explosion hits 3 extra times

Pull Order Recommendation: E0 first, then Sig LC, then E2 for hypercarry efficiency

Castorice Meta Teams and Rotations

Castorice performs best with allies that help drain HP for her Newbud gauge and provide healing to sustain her loops. With the right setup, she can hit massive AoE numbers and even support dual-DPS compositions for fast clears.

So, if you are looking for her ideal teams, these are what we can recommend to you:

F2P Core Team (AS/PF Friendly)

Castorice	Main DPS
Remembrance Trailblazer (E1+)	For CRIT mirrors and skill/ultimate advancement
Gallagher	For HP-drain-triggered healing
Pela	For DEF shredding

Rotation Tips

1. Start with Castorice’s Technique to enter combat
2. Use Skill twice to drain HP and build Newbud
3. Activate Ultimate to summon Netherwing
4. Netherwing does 3x Breath attacks
5. Use joint Skill for healing
6. Follow with 2 more Breaths and Detonate

Your heal cycle will typically refresh every 4–5 turns to maintain loops efficiently.

Premium Hypercarry Team

Castorice	Main DPS
Tribbie	For RES PEN and buffs
Hyacine	For HP-scaling damage and team healing
Ruan Mei	For break efficiency

Rotation Tips

1. Start with Tribbie’s Ultimate
2. Castorice uses Skill twice
3. Activate her Ultimate to summon Netherwing
4. Loop Netherwing Breaths while healing via Skill
5. Detonate
6. Use Hyacine to cleanse debuffs

This setup can achieve two-cycle Memory of Chaos clears with high consistency.

Double DPS Team

Castorice + Mydei	For shared HP drains
Tribbie	For added RES PEN and buffs
Gallagher	For healing

Mydei’s low-HP here states fuel both characters’ Newbud, creating strong dual-DPS loops.

Tips

• Avoid using Harmony shields as they block cocoon procs
• For Quantum-weak enemies, swap Pela for Silver Wolf

Note: If you need some more pull chances for these team members, make sure to top up through Enjoygm. Oneiric shard packs are there with a discount price so pulling them will be easy and straightforward.

Conclusion

So, that is how a Honkai Star Rail Castorice build needs to be done. She transforms Remembrance into a self-sustaining nuke machine. So, if you want to invest on this character, use our guide and make it happen to see how well she can perform through the gameplay.