Quantum
Erudition
Rin Tohsaka
Sixth Head of the Tohsaka Family
TierSS
RolesSub DPS · Support
Release4.4
Rin Tohsaka is a Quantum Erudition sub-DPS and support designed for Archer. Every Skill Point the team spends or recovers gives her Gem Energy and gives that ally +70% CRIT DMG; her Gem Energy then fuels Second Magic Experiment, an enhanced Skill that can bounce up to 33 times. She shares +150% ATK and 15% Quantum RES PEN with Archer and fires a Joint Follow-Up ATK with him that restores 4 Skill Points, which turns his team into one of the best in the game.
Light Cones
Flickering Stars BiS
5★
Signature: CRIT Rate, and once any ally spends 4+ SP in a turn (every Archer turn) all allies ignore 20% DEF and her Skill DMG rises by 72%.
CRIT Rate +18%; when an ally spends 4+ Skill Points in one turn, gains Radiant Crown: all allies ignore 20% DEF and the wearer's Skill DMG +72% for 3 turns.
Into the Unreachable Veil
5★
The Herta's signature: good personal stats and an SP refund on her Ultimate.
CRIT Rate +12%; the Ultimate increases Skill and Ultimate DMG by 60% for 3 turns and refunds 1 Skill Point if it cost 140+ Energy.
Life Should Be Cast to Flames
5★
Anaxa's signature, for its Energy and its 12% DEF reduction (which also enables 4-piece Divine-Querying Master Smith).
Regenerates 10 Energy each turn, DMG +60% against targets with a Weakness implanted by the wearer, and attacks lower DEF by 12% for 2 turns.
Eternal Calculus
5★
Best free option (Herta's Store, S5): ATK per enemy hit, and SPD when she hits 3+ enemies with her Joint ATK.
ATK +8%, +4% ATK per enemy hit until the next attack (up to 5), and SPD +8% for 1 turn when 3 or more enemies are hit.
Today Is Another Peaceful Day
4★
Battle Pass option (S5): a permanent DMG bonus.
Increases DMG based on the wearer's Max Energy (up to 160 Energy counted).
Make the World Clamor
4★
4★ for short fights: 20 Energy on entry gets her Vulnerability up sooner.
Regenerates 20 Energy upon entering battle, and Ultimate DMG +32%.
Relics
Genius of Brilliant Stars
×4
Best in slot against Quantum-weak enemies: Quantum DMG and 20% DEF ignore.
Set effects
2pIncreases Quantum DMG by 10%.
4pWhen the wearer deals DMG to the target enemy, ignores 10% DEF. If the target enemy has Quantum Weakness, the wearer additionally ignores 10% DEF.
The Ashblazing Grand Duke
×4
Her 5-hit Joint ATK stacks up to +48% ATK against 2+ enemies and gets the Follow-Up ATK bonus.
Set effects
2pIncreases the DMG dealt by Follow-Up ATK by 20%.
4pWhen the wearer uses a Follow-Up ATK, increases the wearer's ATK by 6% for every time the Follow-Up ATK deals DMG. This effect can stack up to 8 time(s) and lasts for 3 turn(s). This effect is removed the next time the wearer uses a Follow-Up ATK.
Divine-Querying Master Smith
×4
Only with Life Should Be Cast to Flames: its DEF reduction triggers +15% DMG for the whole team.
Set effects
2pIncreases Max HP by 12%.
4pIncreases the wearer's CRIT DMG dealt to enemy targets in the DEF reduction state by 28%. After the wearer inflicts the DEF reduction state on an enemy target, all allies gain "Comburent" for 2 turn(s). This effect cannot be stacked. The DMG dealt by ally targets with "Comburent" increases by 15%. This effect can be triggered again after the wearer uses an attack.
Planar ornaments
Penacony, Land of the Dreams
×2
The most used sub-DPS option: Energy Regeneration for her and +10% DMG for Archer (and other Quantum allies).
Set effects
2pIncreases wearer's Energy Regeneration Rate by 5%. Increases DMG by 10% for all other allies that are of the same Type as the wearer.
City of Converging Stars
×2
Damage-oriented: the Joint ATK triggers its ATK bonus, and kills give the team CRIT DMG.
Set effects
2pWhen the wearer uses Follow-Up ATK, increases ATK by 24% for 2 turn(s). When an enemy target gets defeated, increases CRIT DMG for all allies by 12% in the current battle. This effect cannot stack.
Lushaka, the Sunken Seas
×2
Energy for her and +12% ATK for the first character of the lineup — put Archer first.
Set effects
2pIncreases the wearer's Energy Regeneration Rate by 5%. If the wearer is not the first character in the team lineup, then increases the ATK of the first character in the team lineup by 12%.
Main stats
Body
CRIT Rate
Feet
SPD
/ ATK%
Planar Sphere
Quantum DMG Boost
/ ATK%
Link Rope
Energy Regeneration Rate
/ ATK%
Substat priority
1SPD
2CRIT Rate
3CRIT DMG
4ATK%
Stat targets
- SPD: 135–160 (140+ before combat ≈ 160 in combat with her A4)
- Energy Regeneration Rate: 119.44% (Energy Rope), 124.44% with Penacony or Lushaka
- CRIT Rate: 90–100% in combat
- CRIT DMG: 120%+ before combat
- ATK: 2,500–3,000+
Talent priority
Talent
Ultimate
Skill
Basic ATK
Major Trace priority: Elegant Conduct (A2) > Ladylike Poise (A4) > Inbound Prosperity (A6).
Light Cones
Flickering Stars BiS
5★
Signature: +72% Skill DMG on her Enhanced Skill bursts.
CRIT Rate +18%; when an ally spends 4+ Skill Points in one turn, gains Radiant Crown: all allies ignore 20% DEF and the wearer's Skill DMG +72% for 3 turns.
Into the Unreachable Veil
5★
Second best for her own damage: CRIT Rate and +60% Skill and Ultimate DMG after her Ultimate.
CRIT Rate +12%; the Ultimate increases Skill and Ultimate DMG by 60% for 3 turns and refunds 1 Skill Point if it cost 140+ Energy.
Today Is Another Peaceful Day
4★
Battle Pass option (S5).
Increases DMG based on the wearer's Max Energy (up to 160 Energy counted).
Eternal Calculus
5★
Free option (Herta's Store, S5).
ATK +8%, +4% ATK per enemy hit until the next attack (up to 5), and SPD +8% for 1 turn when 3 or more enemies are hit.
Relics
Genius of Brilliant Stars
×4
Best against Quantum-weak enemies.
Set effects
2pIncreases Quantum DMG by 10%.
4pWhen the wearer deals DMG to the target enemy, ignores 10% DEF. If the target enemy has Quantum Weakness, the wearer additionally ignores 10% DEF.
Scholar Lost in Erudition
×4
+20% Skill DMG and +25% on the Skill right after her Ultimate, handy for stored Gem Energy bursts.
Set effects
2pIncreases CRIT Rate by 8%.
4pIncreases DMG dealt by Skill and Ultimate by 20%. After using Ultimate, additionally increases the DMG dealt by the next Skill by 25%.
Planar ornaments
Tengoku@Livestream
×2
Her Enhanced Skill burns SP, easily triggering the extra 32% CRIT DMG.
Set effects
2pIncreases the wearer's CRIT DMG by 16%. If 3 or more Skill Points are consumed in the same turn, additionally increases the wearer's CRIT DMG by 32%, lasting for 3 turns.
Penacony, Land of the Dreams
×2
Alternative with Quantum teammates.
Set effects
2pIncreases wearer's Energy Regeneration Rate by 5%. Increases DMG by 10% for all other allies that are of the same Type as the wearer.
Main stats
Body
CRIT Rate
Feet
ATK%
Planar Sphere
Quantum DMG Boost
/ ATK%
Link Rope
ATK%
Substat priority
1CRIT Rate
2CRIT DMG
3ATK%
4SPD
Stat targets
- SPD: base (Sparkle and Cerydra carry her)
- Energy Regeneration Rate: 100%
- CRIT Rate: 90–100% in combat
- CRIT DMG: 120%+ before combat
Talent priority
Talent
Skill
Ultimate
Basic ATK
Her E1 (Shadow Gem) is what makes this build work: a big Enhanced Skill is repeated for free.
Teams
Recommended teams
Master and Servant
Her reference team, among the most used in Memory of Chaos: Sparkle raises the SP limit further and refills SP, and the whole team loops Archer's Skill spam.
With Robin
Sustainless variant: Robin's team-wide action advance means more Archer turns and more Joint ATKs.
Guide
How to play
How she works
- Gem Magecraft (Talent). She enters combat with 20 Gem Energy and gains 1 for every Skill Point any ally consumes or recovers. Whenever an ally consumes or recovers SP, that ally gains +70% CRIT DMG for 2 turns.
- Second Magic Experiment (Enhanced Skill). Available with 15+ Gem Energy or when the team has 7+ SP. It deals 90% ATK to all enemies, then spends 3 Gem Energy per extra 90% ATK bounce (up to 33). If the team has more than 2 SP, it burns them down to 2 and turns each one into 2 Gem Energy.
- Ultimate (160 Energy). 600% ATK to the target and 200% to the other enemies, recovers 1 SP and makes all enemies take 20% more DMG for 3 turns. Her A6 adds 12 Gem Energy.
- Freeform Tohsaka Style (Joint ATK with Archer). After one of Archer's Skill shots, if the team is at 3 SP or less (or he has fired all 5 shots), Rin and Archer launch a Joint Follow-Up ATK on all enemies (300% ATK each) that restores 4 SP. It triggers once, then resets when Rin's turn ends.
- Elegant Conduct (A2). +2 Skill Point limit, and +150% ATK and +15% Quantum RES PEN when entering combat — Archer gets the same bonus.
Rotation
- Use her Technique: +10 Gem Energy at the start of the next fight.
- Make sure she acts at least once between two Archer turns so the Joint ATK is always ready: Basic ATK to generate SP, or Enhanced Skill when she has Gem Energy stored.
- Use her Ultimate before Archer's burst so the Vulnerability is up.
Tips
- As a sub-DPS, aim for 135–160 SPD so she acts between Archer's turns and the Joint ATK is always ready again: 140 SPD before combat becomes about 160 with her A4 (+20% base SPD when entering combat or after an Enhanced Skill).
- Main-DPS Rin (with Sparkle and Cerydra) really starts at E1.
- She plays surprisingly well on auto, as long as survival is covered.
Strengths
- Archer's definitive partner: Joint ATK, +150% ATK and 15% Quantum RES PEN
- Restores huge amounts of Skill Points
- Team-wide CRIT DMG for allies who spend or recover SP
- Surprisingly strong personal damage in single target and AoE
- High Toughness damage and solid Eidolons
Weaknesses
- Very little use outside Archer teams at E0
- Her strongest personal buffs are locked behind Eidolons
- Needs SPD tuning for a reliable Joint ATK
Notable dupes · Eidolon
E1
Big upgrade
An Enhanced Skill that spends 30+ Gem Energy stores it as Shadow Gem, and her next Enhanced Skill reuses it for free: the main-DPS stopping point.
E2
Big upgrade
+30% Skill DMG for her, and all allies' Skill DMG becomes 130% of the original — a huge boost for Archer.
E6
Solid upgrade
+20% All-Type RES PEN for herself, and her Ultimate grants her 24 Gem Energy and an extra turn.
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Updated September 25, 2026 · Version 4.5