Master the rhythm of combat with Castorice, the 5-star Quantum unit whose unique buff cycling makes her the cornerstone of any elite follow-up attack team. This guide will break down how to build her to maximize her potent Crit DMG, DMG% buffs, and unparalleled rotation speed, transforming your team into a synchronized engine of destruction.
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Who is Castorice?
Castorice is a 5★ Quantum unit on the Remembrance Path, specializing in amplifying follow-up attack teams and generating Energy through her unique buff cycling. She provides consistent Crit DMG and DMG% buffs to allies while enhancing the team’s rotation speed. Her kit is designed to shine in coordinated setups that rely on triggering multiple follow-up attacks each turn. With excellent synergy in Quantum-based or FUA-centric teams, she can act as both a primary buffer and rotation accelerator.
Castorice’s Kit: Abilities, Talents, and Eidolons
Basic ATK –Lament, Nethersea’s Ripple
Deals Quantum DMG equal to 50% of Castorice’s Max HP to one designated enemy.
Skill – Silence, Wraithfly’s Caress
Consumes 30% of all allies’ current HP. Deals Quantum DMG equal to 50% of Castorice’s Max HP to one designated enemy and Quantum DMG equal to 30% of Castorice’s Max HP to adjacent targets.
If the current HP is insufficient, reduces the current HP down to 1.
If Netherwing is on the battlefield, the Skill becomes “Boneclaw, Doomdrake’s Embrace” instead.
Skill –Boneclaw, Doomdrake’s Embrace
Consumes 40% of the current HP of all allies (except Netherwing). Castorice and Netherwing launch Joint ATK on the targets, dealing Quantum DMG equal to 30% and 50% of Castorice’s Max HP to all enemies. If the current HP is insufficient, reduces the current HP down to 1.
Ultimate – Doomshriek, Dawn’s Chime
Summons the memosprite Netherwing and advances its action by 100%. At the same time, deploys the Territory “Lost Netherland,” which decreases all enemies’ All-Type RES by 20%. If Castorice has the DMG Boost effect from her Talent, then this effect spreads to Netherwing. Netherwing has an initial SPD of 165 and a set Max HP equal to 100% of max “Newbud.” After Netherwing experiences 3 turns or when its HP is 0, it disappears and dispels the Territory “Lost Netherland.”.
Talent & Support
Talent – The maximum limit of “Newbud” is related to the levels of all characters on the battlefield. For every 1 point of HP lost by all allies, Castorice gains 1 point of “Newbud.” When “Newbud” reaches its maximum limit, can activate the Ultimate. When allies lose HP, Castorice’s and Netherwing’s DMG dealt increases by 20%. This effect can stack up to 3 time(s), lasting for 3 turn(s).Technique – At the start of battle, Castorice grants all allies a short-duration DMG buff, making her a strong initiator for fast clears.
Support-After obtaining Castorice or when Castorice is in the current team, receive the following effect: In battle, when an ally character receives a killing blow, all ally characters that received a killing blow in this action enter the “Mooncocoon” state. Characters in “Mooncocoon” temporarily delay becoming downed and can take actions normally. After the action and before the start of the next turn, if their current HP increases or they gain a Shield, “Mooncocoon” is removed. Otherwise, they will be downed immediately. This effect can only trigger once per battle.
Technique- Wail, Death’s Herald
After using Technique, enters the “Netherveil” state that lasts for 20 seconds. While “Netherveil” is active, enemies are unable to actively approach Castorice.
During “Netherveil,” active attacks will cause all enemies within range to enter combat. At the same time, summons the memosprite Netherwing, advances its action by 100%, and deploys the Territory “Lost Netherland.” Netherwing has its current HP equal to 50% of max “Newbud.” After entering battle, consumes 40% of the current HP of all allies (except Netherwing).
If Netherwing is not summoned after entering battle, Castorice gains “Newbud” by an amount equal to 30% of max “Newbud.”
Castorice Eidolons – Worth Pulling or Not?
Castorice functions well at Eidolon 0, as her base kit already provides excellent team buffs and Energy cycling.• E1 improves the potency and duration of her DMG% buffs, smoothing rotations further.• E2 increases her Ultimate’s buff values and enhances her follow-up scaling.• E4 allows her to extend buffs based on the number of FUAs triggered, greatly amplifying team uptime.• E6 is a major spike, providing additional action advances and multiplicative buffs, pushing her into top-tier support status.For most players, E1 or E2 is already excellent, while E6 is a luxury for high-end teams and leaderboard speedruns.
Materials Farming Guide
Ascension Materials (Level 1–80)
The following are all the ascension materials you need to upgrade Castorice from 0-80.
- Total Materials Total
- Ethereal Omen *15
- Echoing Wail *15
- Eternal Lament *15
- Darkveil Moonlight *65
- Credit *308,000
Trace Materials (Per Trace to Level 10)
The following are all the trace materials you need to enhance Castorice’s Basic ATK, Skill, Ultimate, Talent, Stat Bonus and abilities to the max.
- Ethereal Omen *41
- Echoing Wail *56
- Eternal Lament *58
- Bja of Consciousness *18
- Seedling of Manas *69
- Flower of Ālaya *139
- Auspice Sliver *12
- Tracks of Destiny *8
- Credit *3,000,000
Light Cone Materials (0–80)
- Ethereal Omen *20
- Echoing Wail *20
- Eternal Lament *14
- Bija of Consciousness *4
- Seedling of Manas *12
- Flower of Alaya *15
- Credits 385k
Make sure to pre-farm sufficient Light Cone enhancement materials to push her signature or chosen cone to level 80 on day one.
Best Builds: Light Cones, Relics & Priority
Top Light Cones
⭐ Signature (5★) – “Make Farewells More Beautiful”Increases the wearer’s Max HP and grants a buff that lets them and their memosprite ignore a portion of enemies’ DEF when dealing damage. Additionally, when the memosprite disappears, the wearer’s next action is slightly accelerated.
Alternative 5★ Options:
• To Evernight’s Stars – While the energy restoration is negligible, To Evernight’s Stars increases Castorice’s HP and all memosprites in the party can ignore enemy DEF.
4★ Options (F2P):
• Sweat Now, Cry Less – Increases the wearer’s CRIT DMG and boosts all allies’ damage for a few turns whenever the wearer’s memosprite uses an ability on them.
Relic Sets & Stats
Best Relic Sets:
• 4pc Poet of Mourning– boosts CRIT Rate if the wearer’s SPD is low, with a small SPD reduction; the effect also applies to the wearer’s memosprite.
• 4pc Bone Collection’s Serene Demense – Increases the wearer’s Max HP and boosts CRIT DMG for both the wearer and their memosprite when the wearer’s HP is sufficiently high.
Best Planar Ornaments:
• Bone Collection’s Serene Demesne – Increases her and her memosprite’s CRIT DMG. The effect can be easily activated since Castorice has a lot of HP.
• Arcadia of Woven Dreams – Provides team Crit DMG buff if high Effect RES is achieved.
Main Stats:
• Body: Crit DMG / Crit Rate
• Feet Main: HP%
• Planar Sphere: Quantum DMG or HP%
• Link Rope: HP%
Substats Priority: CRIT Rate/DMG = HP% > CRIT DMG
Best Teams and Rotations for Castorice
Premium Team
Castorice/Evernight/ Tribbie /Hyacine
Castorice’s best team features Evernight and Tribbie since their buffs help out the most for her damage. Tribbie will also benefit from Castorice’s high HP, which will increase her own damage.
Hyacine is the best healer for this team since she can heal all allies and increase the Max HP of the team. Hyacine can also consume more HP through Little Ica and buildup Newbud faster than any other sustain.
F2P Option
Castorice/Trailblazer (Ice)/Pela/Lynx
Castorice’s best free-to-play teammate is the Remembrance Trailblazer with at least E1 unlocked. The Remembrance Trailblazer can provide CRIT DMG buffs, True DMG, and turn advance to Castorice, increasing her damage output.
Pela can decrease the DEF of all enemies while Lynx can increase Castorice’s HP with her Skill.
Double DPS Team
Castorice/Mydei/ Tribbie/Gallagher
Castorice can also be used with another DPS that can consume their own HP. Characters like Mydei and Blade can help accumulate energy for Castorice’s Ultimate.
Conclusion
Castorice is a high-impact Harmony unit that thrives in follow-up and Quantum-centric teams. Her ability to provide Crit DMG, DMG%, and consistent action advancement makes her an excellent addition to many top-tier rotations. She’s powerful at E0, scales well with Eidolons, and fits both premium and F2P teams with ease. Pre-farming her materials and preparing the right relic sets will ensure she shines from day one.
