HSR Castorice + Cyrene Team — Premium Quantum Build Walkthrough

Castorice has been referenced across nearly every HSR endgame article since her debut — Apocalyptic Shadow walkthroughs, Pure Fiction guides, Memory of Chaos team recommendations — but never received a dedicated Build Guide. With Cyrene's Phase 2 rerun live since June 24, 2026, Trailblazers who pulled Cyrene specifically to unlock the Quantum Remembrance hyper-carry archetype are now actively optimizing Castorice teams. This is the complete Castorice Build Guide covering kit mechanics, Light Cones, Relics, Trace priorities, Eidolons, and the team compositions that exploit her ceiling — including the Cyrene synergy package currently dominating endgame.

⭐ Why Castorice Matters Right Now

Castorice is one of HSR's premier Quantum DPS options — a Remembrance path Main DPS whose ceiling depends entirely on team composition. Solo, she's a strong Quantum carry. Paired with Cyrene's Remembrance support kit, she becomes a top-tier endgame finisher capable of clearing Apocalyptic Shadow Starward Mode, Pure Fiction current cycle, and Memory of Chaos premium clears.

The current synergy window is unique:

• 🟢 Cyrene rerun LIVE in HSR 4.3 Phase 2 (since June 24, until early-mid July)
• 🟢 Apocalyptic Shadow "Gale of Forgetting" features Flame Reaver weakness to Quantum + Ice — direct match for Castorice + Cyrene + Evernight
• 🟢 Brand of Anamnesis buff on the Flame Reaver node amplifies Quantum/Ice damage — perfect Castorice exploitation window
• 🟢 Remembrance path content continues to be HSR's strongest premium archetype across multiple endgame modes

For complete Phase 2 banner pull guidance comparing Phainon and Cyrene priorities, see our Phainon vs Cyrene Pull Analysis.

🔮 Castorice Kit Breakdown

Element: Quantum
Path: Remembrance
Role: Main DPS / Quantum Hyper-Carry
Rarity: 5-Star Limited

Castorice's gameplay loop is built around accumulating damage potential through her Memosprite mechanic and Recollection buff stacks from supporting Remembrance teammates. She thrives in extended-burst scenarios where her Ultimate's damage scaling unlocks the team's full ceiling.

Core Gameplay Mechanics:

• Memosprite Summon: Castorice summons her signature memosprite that scales with her HP — survives across multiple turns and contributes to overall damage output
• Recollection Stacks: Receives Recollection buffs when Remembrance teammates take action (key synergy with Cyrene)
• Quantum Damage Focus: Personal damage primarily Quantum-typed, exploits Quantum-weak enemies (perfect for Flame Reaver in current AS cycle)
• Ultimate Burst Window: Major damage output during Ultimate active phases — team-wide damage amplification during burst windows
• HP-Scaling Stat Priority: Unlike standard ATK-scaling DPS, Castorice benefits significantly from HP investment for both survivability and memosprite scaling

🌟 Best Light Cones for Castorice

Tier 1 (5★ BiS Options):

• Castorice's Signature Light Cone — Direct tuning for her kit, provides massive damage scaling during burst windows. If you have it from her release or rerun banners, this is the ceiling option
• Night on the Milky Way — Strong ATK buff scaling with enemy count, exceptional for multi-target Apocalyptic Shadow and Pure Fiction nodes
• In the Night — Crit-focused option that pairs with high-Crit relic builds

Tier 2 (Alternative 5★ Options):

• The Birth of the Self — Erudition-path option with Crit DMG scaling
• On the Fall of an Aeon — Reliable ATK and Break-buff stacker

Budget/F2P (4★ Light Cones):

• Make the World Clamor — Energy Regen focus for Ultimate uptime cycling
• Passkey — Strong F2P option with Energy Regen
• Memories of the Past — Reasonable substitute for Erudition-pathed scaling

For F2P Trailblazers, Make the World Clamor or Passkey enables functional Ultimate cycling — Castorice's kit benefits from frequent Ultimates, making Energy Regen-focused Light Cones surprisingly competitive without the signature investment.

🛡️ Best Relics & Planar Ornaments

4-Piece Relic Set BiS:

• Poet of Mourning Collapse (4-piece) — Currently the strongest Quantum damage set for Castorice, providing both Quantum DMG bonus and additional scaling effects that align with her kit

Planar Ornaments (Choose Based on Build Direction):

• Firmament Frontline: Glamoth (2-piece) — Best for SPD-focused builds; requires 135 SPD threshold to activate full bonus, scales further at 160 SPD
• Rutilant Arena (2-piece) — Best for Crit-focused builds; requires 70% Crit Rate threshold to activate full bonus
• Pan-Cosmic Commercial Enterprise (2-piece) — Effect Hit Rate focus, niche for specific compositions

The choice between Glamoth and Rutilant Arena depends on your relic substat luck — if you've rolled high SPD across multiple pieces, Glamoth wins; if your Crit Rate naturally reaches 70%+, Rutilant Arena provides more consistent damage.

📊 Stat Priorities

Main Stats by Slot:

• Body: Crit Rate or Crit DMG (target 1:2 ratio between Rate and DMG)
• Feet: SPD (priority) or ATK% (if SPD breakpoints already met)
• Sphere: Quantum DMG Bonus
• Rope: ATK% (primary) or Energy Regeneration Rate (if Ultimate uptime needs boost)

Substat Priority Order:

1. Crit Rate / Crit DMG (target 70%+ Crit Rate, 200%+ Crit DMG)
2. SPD (target 134+ baseline, 160+ for Glamoth full activation)
3. ATK%
4. HP% (secondary — scales memosprite damage)
5. Effect Hit Rate (situational for specific debuff applications)

Speed Breakpoints:

• 134 SPD — Baseline for most endgame teams
• 160 SPD — Glamoth full activation threshold
• 180 SPD — Premium breakpoint for tight Apocalyptic Shadow scoring

🎯 Trace Priority

Castorice's Trace upgrade order to maximize damage ceiling:

1. Ultimate — Primary damage source; max first
2. Talent — Affects passive damage scaling and memosprite mechanics
3. Skill — Damage scaling secondary to Ultimate
4. Basic Attack — Lowest priority, only fills as resource constraints allow

Major Traces:

• Prioritize Crit-focused major traces if running Crit build
• Prioritize HP%/ATK% major traces for hybrid stat balance
• Unlock all 3 major trace tiers as Credit and material budget allows

🎰 Eidolon Ranking

Castorice's Eidolon value distribution:

• E0 — Fully functional; her base kit is one of the strongest among Quantum DPS units
• E1 — Quality-of-life improvements, typically Energy Regen or burst damage refinement; moderate gain
• E2 — Significant power spike; recommended ceiling for most Trailblazers who pull again
• E3-E5 — Incremental gains, primarily for whales
• E6 — Major final ceiling unlock; whale tier

For most Trailblazers, E0 is a complete experience — Castorice's E0 ceiling is high enough that additional Eidolons offer luxury improvements rather than required upgrades. Save Stellar Jades for character + signature Light Cone rather than chasing Eidolons unless budget allows.

👥 Best Castorice Team Compositions

Team #1: Castorice Premium Remembrance Core (BiS — Current Synergy Peak)

• Castorice (Main DPS — Quantum carry)
• Cyrene (Remembrance buffer/sub-DPS — Phase 2 rerun NOW available)
• Evernight (Ice Sub-DPS — Ice element for Brand of Anamnesis buff)
• Hyacine (Remembrance sustain — completes Remembrance team for full path buffs)

This is the consensus best team for current Apocalyptic Shadow "Gale of Forgetting" cycle. All four members benefit from the Brand of Anamnesis buff (Quantum/Ice damage amplification), and the team composition exploits Flame Reaver's elemental weaknesses perfectly. Cyrene's Phase 2 rerun is the keystone — without her, this team archetype is locked behind banner availability.

Team #2: Castorice + Cyrene + Flex DPS + Sustain

• Castorice (Main DPS)
• Cyrene (Remembrance buffer)
• Robin or Sunday (Harmony amplifier — universal damage scaling)
• Huohuo or Lingsha (Sustain — Energy Regen support)

For Trailblazers without Evernight, this composition substitutes a universal Harmony buffer to maintain Castorice's damage ceiling. Robin's partywide ATK% buff or Sunday's Energy + Crit DMG scaling both work — pick based on what's already built in your roster.

Team #3: Castorice + Trailblazer (Remembrance) Budget Comp

• Castorice (Main DPS)
• Trailblazer (Remembrance/RMC) (Path partner — free 5★)
• Hyacine or Huohuo (Sustain)
• Flexible support (Robin, Tingyun, Bronya)

For Trailblazers who missed Cyrene's Phase 2 rerun, the Remembrance Trailblazer (RMC) serves as a budget Cyrene substitute. Significantly lower ceiling than Cyrene, but maintains the Remembrance path bonuses needed for team scaling.

Team #4: F2P Friendly Composition

• Castorice (Main DPS)
• Trailblazer (Remembrance) (Free path partner)
• March 7th Hunt (4-star) (Imaginary support — F2P accessible)
• Natasha or Lynx (4-star sustain)

For pure F2P Trailblazers, this composition provides functional clears with minimal investment. Lower ceiling but solid for standard endgame content completion.

🤝 Cyrene Team Synergy Deep Dive

Cyrene + Castorice synergy is the headline reason to pull Cyrene during Phase 2. Here's exactly how the synergy works:

• Recollection Stacks: When Cyrene takes action, she generates Recollection stacks that Castorice consumes for damage scaling
• Demiurge Memosprite (Cyrene's): Cyrene's summon contributes True Damage that complements Castorice's Quantum damage output
• Remembrance Path Bonuses: Both characters scale through Path bonuses; teams with multiple Remembrance characters unlock the strongest Path scaling tier
• Ice Element Coverage: Cyrene's Ice damage complements Castorice's Quantum on dual-weakness nodes (current Flame Reaver perfect fit)
• 180+ SPD Target on Cyrene: Higher Cyrene SPD = more Recollection generation = more Castorice damage windows

For complete Cyrene-focused Pull Analysis covering whether to commit during Phase 2, our Phase 2 Pull Analysis compares Cyrene vs Phainon resource allocation.

🏆 Endgame Content Performance

How Castorice performs across HSR's three endgame modes:

Apocalyptic Shadow "Gale of Forgetting"

• 🟢 Direct counter to Flame Reaver (Quantum + Ice weakness)
• 🟢 Brand of Anamnesis buff amplifies Quantum/Ice damage
• 🟢 Premium team composition clears Starward Mode reliably for 7,500+ scoring

Pure Fiction Starward Mode

• 🟡 Functional but not optimal — Pure Fiction rewards AoE wave clearing, where Castorice's single-target focus is less dominant
• 🟡 Best paired with Erudition AoE carries for mob-clearing
• 🟢 Cyrene support contribution remains valuable across mode

Memory of Chaos

• 🟢 Strong for Quantum-weak boss nodes
• 🟢 Cycle-efficient burst windows clear high-HP enemies effectively
• 🟢 Pairs well with Remembrance path bonuses across full-team Remembrance compositions

For complete endgame mode strategy across all three modes including Starward Mode integration, see our HSR 4.3 Starward Mode Master Guide.

💎 Investment Depth Recommendations

Match your investment to how central Castorice will be in your endgame rotation:

Tier 1: Functional Castorice (E0, 4★ Light Cone)

• Castorice E0 + Make the World Clamor or Passkey
• 4-piece Poet of Mourning Collapse with reasonable substats
• 2-piece Glamoth or Rutilant Arena ornaments
• Functional clears of all current endgame content

Tier 2: Premium Castorice (E0/E1, 5★ Light Cone)

• Castorice E0/E1 + Signature Light Cone or Night on the Milky Way
• Optimized substats (Crit Rate 70%+, Crit DMG 200%+)
• Ceiling damage for Apocalyptic Shadow Starward Mode

Tier 3: Whale Tier (E2+, Signature + Cyrene E2 + Hyacine E2)

• Multi-character Eidolon investment
• Premium clears for 7,500+ Apocalyptic Shadow scoring
• Future-proofs Castorice for Version 4.4+ endgame cycles

💡 Build Tips for Castorice

• Don't undervalue Energy Regeneration — Ultimate cycling is core to her damage output; ERR on Rope can outperform ATK% in tight rotations
• Target SPD breakpoints precisely — 134 baseline, 160 for Glamoth, 180 for premium scoring; don't over-invest beyond your target
• Crit Rate vs Crit DMG balance — 1:2 ratio (70% Rate / 140% DMG minimum) before over-investing in either stat
• Hyacine sustain enables Castorice ceiling — Hyacine's Energy Regen support directly boosts Ultimate frequency
• Don't pull for Castorice Eidolons during Cyrene Phase 2 — Resources are better spent on Cyrene this banner cycle
• Cyrene synergy peaks in current Apocalyptic Shadow — Use this cycle to push max score before Brand of Anamnesis buff rotates out
• 180+ SPD on Cyrene is essential — Cyrene's SPD directly scales Castorice's damage windows
• Remembrance Trailblazer (RMC) works as Cyrene substitute — Free 5★ option for budget teams

📊 Castorice vs Other Quantum DPS

Compared to Acheron (Premium Nihility Quantum-adjacent):

• Acheron = Nihility path with Lightning damage; uses different team archetype entirely
• Castorice = Remembrance Quantum specialist; cleaner team-building requirements
• Different paths — not competing for same team slot

Compared to Seele (Hunt Quantum DPS):

• Seele = Hunt path single-target nuker
• Castorice = Remembrance hyper-carry with team scaling
• Castorice scales higher in team-built compositions; Seele performs better in solo-carry scenarios

Compared to Silver Wolf LV.999 (Premium Quantum Hybrid):

• Silver Wolf LV.999 = Hybrid Main DPS / debuffer
• Castorice = Pure Main DPS focus
• Different roles — coexist in same team for hybrid compositions

🎯 Why Pull Cyrene NOW for Castorice Teams

If you own Castorice but didn't pull Cyrene during her original release banner, her Phase 2 rerun (now LIVE until early-mid July) is the keystone unlock for the premium Castorice team archetype. Without Cyrene, you're stuck with the budget Remembrance Trailblazer (RMC) substitute — functional but significantly lower ceiling.

Specifically:

• 🟢 Phase 2 banner LIVE = guaranteed pull access until early-mid July
• 🟢 Recollection generation transforms Castorice's damage windows
• 🟢 Cyrene's signature Light Cone "This Love, Forever" provides 180+ SPD without forcing relic SPD investment
• 🟢 Current Apocalyptic Shadow cycle directly rewards Cyrene's Ice element
• 🟢 Future endgame cycles will continue to reward Remembrance path investment

🛒 Build Castorice to Endgame Ceiling

Cyrene's Phase 2 rerun closes in approximately 14 days — and Trailblazers ready to unlock the premium Castorice + Cyrene team can capture the strongest current endgame archetype. Trailblazers ready to push every Apocalyptic Shadow node, Pure Fiction Starward Mode, and Memory of Chaos cycle to maximum score can explore trusted Honkai: Star Rail Accounts with deep rosters and pre-built endgame teams, accelerate every Relic and Trace material farming session with expert Honkai: Star Rail Hourly Services, or clear every endgame node through reliable Honkai: Star Rail Boosting.

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