Best Light Cone
Make Farewells More Beautiful
Best Relic Set
Poet of Mourning Collapse 4pc
Planar Set
Bone Collection's Serene Demesne
Key Mechanic
HP Loss = Newbud
Best Partner
Remembrance Trailblazer

Skills

Basic Lament, Nethersea's Ripple

Deals Quantum DMG equal to 25% of Castorice's Max HP to one designated enemy. A straightforward single-target hit that still deals respectable damage because it scales off Max HP rather than ATK, making it relevant even in the late game.

25% of Max HP
Skill Silence, Wraithfly's Caress

Consumes 30% of all allies' current HP and deals Quantum DMG equal to 25% of Castorice's Max HP to the target and 15% to adjacent enemies. HP cannot drop below 1. When Netherwing is on the battlefield, this becomes Boneclaw, Doomdrake's Embrace, a joint attack consuming 40% of all allies' HP (except Netherwing) that hits all enemies for 15% + 25% of Castorice's Max HP. This HP consumption is the primary Newbud charging engine.

25% Max HP, main target
Ultimate Doomshriek, Dawn's Chime

Summons the memosprite Netherwing and advances its action by 100%. Simultaneously deploys the Territory "Lost Netherland," which decreases all enemies' All-Type RES by 10%. Netherwing has a base SPD of 165 and Max HP equal to 100% of max Newbud. It disappears after 3 turns or when its HP hits 0, at which point it triggers the finishing burst from Wings Sweep the Ruins. Any DMG Boost effects Castorice holds from her Talent are shared with Netherwing upon summoning.

10% All-Type RES Shred
Talent Desolation Across Palms

The core engine. For every 1 HP lost by any ally, Castorice gains 1 point of Newbud. When Newbud reaches its max, the Ultimate becomes available. Whenever allies lose HP, Castorice's and Netherwing's DMG dealt increases by 10% (stacks up to 3 times, lasts 3 turns). When Netherwing is on the field, Newbud cannot be gained through the Talent. Instead, all HP losses by allies (except Netherwing) are converted to an equal amount of HP for Netherwing, sustaining its battlefield presence.

10% DMG per HP-loss stack
Technique Wail, Death's Herald

Enters the "Netherveil" state for 20 seconds. Enemies cannot approach Castorice while active. Active attacks during Netherveil cause all nearby enemies to enter combat while simultaneously summoning Netherwing (100% action advance) and deploying the Territory "Lost Netherland." Netherwing's HP starts at 50% of max Newbud. Upon entering battle, consumes 40% of all allies' current HP (except Netherwing). If Netherwing does not persist after entering battle, Castorice gains Newbud equal to 30% of max Newbud as a fallback.

30% Newbud fallback

Build Targets

Relic Main Stats
Head
HP (fixed)
Hands
ATK (fixed)
Body
CRIT DMG
or CRIT Rate
Feet
HP%
avoid SPD rolls
Planar Sphere
HP%
or Quantum DMG
Link Rope
HP%
Stat Targets
HP7000+
CRIT Rate~100% in combat
CRIT DMG150%+
Speed<95 (avoid breakpoints)
Substat Priority
01
CRIT Rate / CRIT DMG balance toward 1:2
02
HP% scales all HP-based DMG
03
DEF% survivability
04
Speed keep below 95
Skill Upgrade Order
Ult
1st
Skill
2nd
Talent
3rd
Basic
Last
Ultimate first to maximize Netherwing's damage output, as it governs almost all of Castorice's burst windows. Skill second since HP cost scales damage and accelerates Newbud gain. Talent third for the stacking DMG buff. Basic ATK is the lowest priority since it sees minimal use in optimized rotations.

Best Light Cones

#1
Make Farewells More Beautiful
Make Farewells More Beautiful
Castorice's signature Light Cone and her clear best-in-slot option. Provides significant HP scaling bonuses that directly amplify all of her HP-based damage multipliers. Unless you have the Battle Pass cones, this is effectively mandatory for maximum performance.
Signature
#2
Sweat Now, Cry Less
Sweat Now, Cry Less
The best F2P-accessible alternative, available through the Battle Pass. Provides solid stats that complement Castorice's HP-focused build without requiring gacha investment beyond the base character.
Battle Pass
#3
Time Waits for No One
Time Waits for No One
A strong 5-star option from the permanent pool. The high base HP stat directly feeds into Castorice's damage scaling. Prioritize this if you do not have her signature and lack the Battle Pass cones.
5-star pool
#4
Flames Afar
Flames Afar
Another solid alternative that works around Castorice's HP loss mechanic. The passive activates naturally in her kit and provides a meaningful damage bonus when team members lose HP.
alternative
#5
Victory in a Blink
Victory in a Blink
Budget pick for players without other Remembrance options. Offers basic stat support and is usable in early progression before more targeted Light Cones become available.
budget

Best Relics

Cavern Sets
1
Poet of Mourning Collapse
Poet of Mourning Collapse
Castorice's best-in-slot cavern set by a clear margin. The 4-piece bonus increases Quantum DMG and raises the CRIT Rate of both Castorice and her memosprite Netherwing, one of the few sets in the game that benefits a character and their summon simultaneously. The set's synergy with Netherwing is unique and irreplaceable at this tier of performance. Avoid Speed substats to let the set function at full capacity.
4-piece Best in Slot
2
Longevous Disciple
Longevous Disciple
Excellent alternative if your Poet pieces have poor substat rolls. Provides an HP bonus to Castorice and grants CRIT Rate whenever she consumes HP, a passive that triggers naturally on every Skill use. The 2-piece bonus from this set can also be mixed with 2 pieces of Poet if needed.
4-pieceAlternative
3
2pc Poet + 2pc Longevous Disciple
A mixed-set option that captures partial bonuses from both cavern sets. Use this configuration when you have well-rolled pieces from both sets but lack a complete 4-piece of either with ideal substats.
2+2 mix
Planar Ornament Sets
1
Bone Collection's Serene Demesne
Bone Collection's Serene Demesne
Castorice's best planar set. Since the Poet of Mourning Collapse already supplies large amounts of CRIT Rate for both Castorice and Netherwing, the Bone Collection set focuses on boosting CRIT DMG, which becomes the primary scaling stat to stack once CRIT Rate approaches the cap. The HP-boosting sphere also directly amplifies all of her damage multipliers.
2-piece Best in Slot
2
Rutilant Arena
Rutilant Arena
Solid backup planar set. Provides a CRIT Rate bonus and a 8% DMG bonus when CRIT Rate is at or above 70%. Castorice easily hits this threshold with the Poet set active. Use this if your Bone Collection Sphere and Rope have poor main or substats.
2-piece

Best Teams for Castorice

Castorice's Global Passive (Mooncocoon Shrouds the Form) means allies cannot drop below 1 HP while Netherwing is active. Build teams that consume HP aggressively to stack Newbud fast and push Netherwing's damage cap.

01 · Premium Best-in-slot composition
Castorice
Castorice
Main DPS
Sunday
Harmony / Action Advance
Tribbie
Support / HP Buff
Huohuo
Healer / Sustain
Sunday provides action advance to Netherwing, dramatically increasing its turn count and DPS window. Tribbie's high HP stat and buffs synergize perfectly with Castorice's HP-scaling kit. Huohuo keeps the team alive through HP consumption and provides an ult energy battery passive.
02 · F2P Friendly All accessible or free characters
Castorice
Castorice
Main DPS
Robin
Harmony / Damage Amp
Sparkle
Harmony / CRIT DMG
Gallagher
Healer / Sustain
Gallagher is the ideal F2P sustain for Castorice. His healing through Besotted and Enhanced Basic ATK keeps the team stable while costing minimal skill points. Sparkle provides valuable CRIT DMG and skill point generation. Robin's universal damage amplification benefits both Castorice and Netherwing equally.
03 · Double HP Carry Maximum Newbud generation
Castorice
Castorice
Main DPS
Aventurine
Sub DPS / Shield
Tribbie
Support
Lingsha
Healer / Off-turn DMG
Lingsha's off-turn follow-up attacks provide supplementary damage while keeping the party alive. Aventurine's shield ensures allies survive aggressive HP consumption. This composition maximizes overall team damage while keeping Castorice's Newbud meter topped up continuously.
04 · Budget / Starter No limited 5-stars required
Castorice
Castorice
Main DPS
Sunday
Harmony / CRIT Amp
Fu Xuan
Shield / Sustain
Gallagher
Healer
Fu Xuan's matrix passive redistributes incoming damage and provides CRIT Rate, synergizing well with Castorice's HP-consumption playstyle. Sunday's CRIT buffs and action advance help compensate for weaker supports. Gallagher handles healing efficiently. This team clears all endgame content without requiring any characters beyond Castorice herself.
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Eidolons

E 1
Snowbound Maiden, Memory to Tomb
When an enemy target's current HP is at 80% or below of its Max HP, DMG dealt by Boneclaw, Doomdrake's Embrace; Claw Splits the Veil; Breath Scorches the Shadow; and Wings Sweep the Ruins increases to 120% of original DMG. When the enemy's HP is at 50% or below, this further increases to 140% of original DMG. A meaningful damage multiplier that activates reliably in endgame content where enemies begin at full HP and are quickly brought down.
High Pull Value
E 2
Crown on Wings of Bloom
After summoning Netherwing, Castorice gains 2 stacks of "Ardent Will" (max 2 stacks). Ardent Will can be spent to offset the HP cost of Netherwing's "Breath Scorches the Shadow" and advances Castorice's action by 100%. When using the next Enhanced Skill (Boneclaw), Castorice additionally gains Newbud equal to 30% of max Newbud. This dramatically accelerates Castorice's rotation speed and reduces the dependency on party HP losses to fuel Netherwing.
Game Changer
E 3
Pious Pilgrim, Dance in Doom
Ultimate level +2 (max 15), Basic ATK level +1 (max 10), and Memosprite Talent level +1 (max 10). The Ultimate level increase directly improves the power of Netherwing's summoning and the Territory effect. The Memosprite Talent level boost improves Netherwing's own ability scaling, compounding the gains from this eidolon.
Solid Upgrade
E 4
Rest in Songs of Gloom
While Castorice is on the field, all allies' Incoming Healing during HP restoration increases by 20%. This improves team-wide survivability and makes HP recovery from Wings Sweep the Ruins more impactful, helping the team stay healthy through extended fights without requiring a dedicated high-healing support.
Good Passive
E 5
Pristine Pages, Prophecy as Plume
Skill level +2 (max 15), Talent level +2 (max 15), and Memosprite Skill level +1 (max 10). Skill upgrades directly increase HP consumption damage, amplifying Newbud generation efficiency and raw output. Talent upgrades boost the DMG Boost effect per stack, compounding across all of Castorice's and Netherwing's hits.
Incremental
E 6
Await for Years to Loom
When Castorice or Netherwing deals DMG, Quantum RES PEN increases by 20%. During Netherwing's attacks, it can reduce enemy Toughness regardless of Weakness type, and when breaking Weaknesses this way, it triggers the full Quantum Weakness Break effect. Additionally, the number of Bounces for Netherwing's Talent "Wings Sweep the Ruins" increases by 3 (from 6 to 9 total bounces). This is a transformative eidolon that massively extends the finishing burst damage.
Massive Upgrade

Major Traces

Contained Dark Tide
Ascension 2
After ally targets (excluding Netherwing) receive healing, converts 100% of the healed amount into Newbud. If Netherwing is on the field, this is converted to Netherwing's HP instead. Each ally can accumulate up to 12% of max Newbud per conversion window, and the counter resets after any unit takes action. This trace turns every heal into fuel for Castorice's engine.
Inverted Torch
Ascension 4
When Castorice's current HP is at or above 50% of her Max HP, her SPD increases by 40%. When Netherwing uses "Breath Scorches the Shadow" and deals fatal damage or brings all enemies to an HP state where they cannot be reduced further, Netherwing's SPD increases by 100% for 1 turn, effectively granting Netherwing an immediate bonus action in kill scenarios.
Where The West Wind Dwells
Ascension 6
Each time Netherwing uses "Breath Scorches the Shadow," the DMG dealt increases by 30%. This effect stacks up to 6 times and lasts until the end of that turn. In practice, a single Netherwing turn with 6 Breath stacks applies an effective 180% DMG multiplier increase, making the Breath Scorches chain one of the highest single-turn burst windows in the game.
+13.3%
CRIT DMG
+18.7%
CRIT Rate
+14.4%
Quantum DMG

Upgrade Materials

Ethereal Omen
Character Ascension
Bija of Consciousness
Trace Material
Darkveil Moonlight
Boss Drop
Auspice Sliver
Weekly Boss Drop

Frequently Asked Questions

Castorice's signature Make Farewells More Beautiful is a significant upgrade but not strictly required for clearing all endgame content. Sweat Now, Cry Less from the Battle Pass is a strong alternative. If you have neither, Time Waits for No One from the permanent pool covers her HP scaling needs reasonably well. Her team-building is F2P friendly even if the Light Cone is a premium purchase.
For every 1 point of HP lost by any ally, Castorice gains 1 point of Newbud. The maximum Newbud limit scales based on the levels of all characters on the battlefield. When Newbud reaches its maximum, Castorice can activate her Ultimate (Doomshriek, Dawn's Chime) to summon Netherwing. The primary Newbud sources are: Castorice's Skill consuming 30% of all allies' HP, heals converting to Newbud via the Ascension 2 trace, and the Technique providing 30% Newbud at the start of a fight.
The Poet of Mourning Collapse relic set, Castorice's best-in-slot, has a condition where going above a certain Speed threshold causes it to lose effectiveness. The recommended target is to keep Speed below 95. This means actively avoiding Speed substats on relics and not running any Speed main stats on Feet. Castorice compensates for her low base Speed (95) through Netherwing's independent high SPD of 165 and the Inverted Torch trace bonus.
While Netherwing is on the battlefield, the Mooncocoon Shrouds the Form passive activates: when allies take DMG or consume HP, their current HP can only be reduced to a minimum of 1. After that threshold, Netherwing absorbs any further damage at 500% of the original value, consuming its own HP until it disappears. This means you can aggressively use Castorice's HP-consuming Skill during Netherwing's presence with zero risk of killing your allies.
Gallagher is the top F2P healer since his healing through Besotted is skill-point neutral and his Enhanced Basic ATK provides burst healing when needed. Among limited 5-stars, Huohuo provides energy restoration and consistent AoE healing. Lingsha is excellent if you have Sunday. Sunday can redirect his action advance to Lingsha's summon, keeping the party alive through off-turn follow-up heals. Avoid healers that require many Skill Points, as Castorice herself needs them for her Skill rotations.
E1 provides a meaningful DMG multiplier against enemies below 80% and 50% HP thresholds, which reliably activates in endgame fights. E2 is the most impactful eidolon: it generates Ardent Will stacks that eliminate HP costs on Netherwing's Breath attacks and advance Castorice's own action, significantly compressing her rotation. E6 adds 3 extra Wings Sweep bounces and 20% Quantum RES PEN, representing the largest raw damage jump. E1 and E2 offer the best value for players who want to invest beyond E0.
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