Rin Tohsaka — Honkai Star Rail Character Guide

Overview

Dedicated Archer support whose joint Follow-up ATK refunds 4 SP and shares 150% ATK plus 15% Quantum RES PEN with him, layering 70% CRIT DMG on every SP move. Banks Gem Energy for an on-demand bounce nuke, but loses most of her value without Archer.

Quantum Erudition support built around Skill Points and her Gem Energy resource. She raises the SP cap by 2, generates SP with Basic ATKs, and converts every SP the team consumes or recovers into Gem Energy while granting the acting ally 70% CRIT DMG. With Archer on the team she shares her 150% ATK and 15% Quantum RES PEN combat-entry buff with him, and their joint Follow-up ATK (300% of each character's ATK to all enemies) refunds 4 SP once per cycle — the engine that funds his 5-Skill rotations. Banked Gem Energy powers her Enhanced Skill, a bounce nuke that spends 3 gems per 90% ATK hit for up to 33 hits, giving her an on-demand burst without spending SP.

Key Mechanics

• Gem Energy is her core resource: 20 on combat entry (+10 from Technique), +1 per SP any ally consumes or recovers, +12 per Ultimate. It only leaves through her Enhanced Skill, so passively playing Basic ATKs banks a progressively bigger nuke.
• The 70% CRIT DMG talent buff applies to whichever ally consumed or recovered SP — Archer's multi-Skill turns keep it permanently active on him, and Sparkle's CRIT DMG conversion scales off it further.
• The joint Follow-up ATK triggers after Archer's Skill when SP is 3 or fewer OR after his 5th Skill in a Circuit Connection, once per cycle, resetting when Rin's turn ends — she must act between Archer turns to re-arm it. The 4 SP refund is worth 2 more Skills to him, and the AoE hit covers his single-target blind spot.
• Enhanced Skill piloting: it costs 0 SP but drains team SP above 2 into gems (3 gems per SP with the talent). Use it when SP is already spent, when a burst window demands it (end of a boss phase, add waves), or to refresh the A4 SPD buff — not on cooldown.
• SPD tuning targets Sparkle: any loop where Rin acts between Archer turns re-arms the joint attack, so the real goal is simply not getting lapped by Sparkle (~140 geared SPD with the A4 buff, closer to Sparkle's SPD in long fights). ATK boots are viable in short fights, with Remembrance Trailblazer, or as a main DPS.
• Ultimate deliberately held: basic-spamming slows her Energy, so the 20% Vulnerability and 1 SP refund are timed to Archer's burst turns rather than fired on cooldown.
• joint-attack
• Freeform Tohsaka Style
• Dual-character Joint Follow-Up ATK with Archer. After Archer uses his Skill, if SP is 3 or fewer or he has used his Skill 5 times in the current Circuit Connection, Rin and Archer strike all enemies together and refund 4 SP.
• Trigger check runs after Archer's Skill "Caladbolg II: Fake Spiral Sword": SP ≤ 3 OR 5 active Skill uses in the current Circuit Connection state.
• Deals Quantum DMG equal to 300% of Rin's ATK plus 300% of Archer's ATK to all enemies, then recovers 4 SP for allies — the refund that converts Archer's SP-starved late rotation into 2 extra Skills.
• Triggers once, and the count resets when Rin's turn ends — Rin must take a turn between Archer's turns to re-arm it; getting lapped by Sparkle costs a joint attack.
• Counts as a Follow-up ATK from an ally action, so it can trigger Archer's own Talent Follow-up (another SP back) and feeds follow-up-conditioned team effects and relic sets.
• Gives the otherwise single-target Archer team real AoE coverage for trash waves and add phases.
• Entirely inactive without Archer on the team.
• enhanced-state
• Second Magic Experiment (Gem Energy)
• Her Skill enhances into a Gem-Energy-fueled bounce nuke while she holds 15+ Gem Energy or the team has 7+ SP. It spends banked gems — not SP — making it a stored burst she can fire on demand.
• Deals Quantum DMG equal to 90% ATK to all enemies, then consumes 3 Gem Energy per bounce of 90% ATK against random living enemies, up to 33 bounces (99 Gem Energy) per cast.
• On use, if current SP is above 2, consumes SP down to 2 and gains 2 Gem Energy per SP consumed — on top of the talent's 1 per SP, so each SP converted this way is worth 3 gems (9 extra bounce damage percent-points of ATK each).
• Gem consumption is capped by what is needed: bounces stop when enemies are dead, conserving the remaining Gem Energy for the next cast.
• Costs no SP by itself, so it is usable even right after Archer empties the SP bar.
• Using it refreshes the A4 20% SPD buff.
• In Archer teams this is a burst-window tool, not a rotation piece — SP converted into her damage is generally worth more fired by Archer.

Rin Tohsaka FAQ

Who works best with Rin Tohsaka in HSR?

Rin Tohsaka's best team options include Cerydra, Sparkle, Mortenax Blade. StarGuide rates teammates by role and composition fit so the recommendation reflects how the character is actually played.

What relics should Rin Tohsaka use?

Rin Tohsaka's recommended relic setup is Genius of Brilliant Stars with City of Converging Stars, with stat targets around CRIT Rate ~100% in-combat, SPD ~140 geared / ~160 in combat.

What is the best light cone for Rin Tohsaka?

Flickering Stars is the top listed light cone for Rin Tohsaka. Signature. 18% CRIT Rate plus Radiant Crown: whenever any ally consumes 4+ SP in one turn — automatic in Archer rotations — the team gains 20% DEF ignore and she gains 72% Skill DMG for 3 turns. The premium stop for Archer teams and a big spike for the main-DPS mode; E0S0 already does the core job, so it is a luxury rather than a requirement.

How should I invest in Rin Tohsaka?

Rin Tohsaka's first listed investment priority is LC S1. The premium Archer-team stop is E0S1: 18% CRIT Rate, near-permanent 20% team DEF ignore under Radiant Crown (Archer's rotations trivially consume 4+ SP in a turn), and 72% Skill DMG for her own bursts.

Important Notes

• Archer-locked value: the joint Follow-up ATK, the shared 150% ATK / 15% Quantum RES PEN trace, and the SP engine are all built around Archer — without him she shrinks to a generic SP-positive amplifier and loses most of her worth.
• Her Enhanced Skill drains team SP above 2 when cast — SP converted into her damage is generally worth more fired by Archer, so treat the nuke as a burst-window tool, not a rotation piece.
• The joint attack only re-arms when Rin takes a turn between Archer's turns; if Sparkle laps her (or an MoC wave ends on Archer's turn), a cycle's joint attack — and its 4 SP — is lost.
• Collab character obtained on the dedicated collab Warp with no free-claim alternative; eidolons and the signature Light Cone come only from that Warp.
• The main-DPS mode is investment-gated: E1 plus the signature at minimum, ideally with Cerydra and Sparkle — at E0S0 her carry damage is too volatile to recommend.
• cerydra
• S
• Best support for her carry mode: Coup de Main duplicates the Enhanced Skill without consuming Gem Energy — a free copy of her biggest hit — while smart gem consumption stretches every bank further. Her CRIT DMG and RES PEN buffs scale the nuke, and her SPD support loosens Rin's tuning.
• sparkle
• S
• Top-priority SP battery for carry Rin: funds the SP the Enhanced Skill loop devours, accelerates Gem Energy stacking, and layers CRIT DMG on top — worth bringing even though her Advance is partly wasted under Rin and Cerydra's SPD buffs.
• mortenax-blade
• A
• Preferred sustainless third amplifier: DEF shred, Vulnerability, and +50% ally DMG all multiply the Enhanced Skill window, with AoE chip damage on top. No gem or SP synergy — he amplifies the burst rather than enabling it.
• robin-summeretto
• A
• Broad generic buffing that Rin Tohsaka converts cleanly — flat ATK from Robin's trace, Zone DEF ignore, and up to 16% vulnerability across the team, with an off-turn advance and 20% Max Energy on her Ultimate. Cerydra and Sparkle both target this shell's specific needs more directly.
• trailblazer-remembrance
• B
• The free-to-play sustainless option: Mem's True DMG and 100% advance compress her burst window, but the lower team SP generation works against the Enhanced Skill loop — Mortenax keeps the third slot when available.
• tribbie
• B
• Best fielded at E1, where her amplification uptime covers the full burst window — but her RES PEN and DMG Taken buffs stay generic here, with no SP or gem contribution to the loop, so Mortenax and Mem remain the stronger picks.
• welt
• B
• Budget sustainless filler: slow and Imprisonment add real safety when no sustain is present, and his DMG Taken debuff helps the nuke — but he contributes nothing to the gem or SP engine.

Rin Tohsaka Investment Priority

1. LC S1 — The premium Archer-team stop is E0S1: 18% CRIT Rate, near-permanent 20% team DEF ignore under Radiant Crown (Archer's rotations trivially consume 4+ SP in a turn), and 72% Skill DMG for her own bursts.
2. E1 — Not a meaningful Archer-team upgrade — it is the main-DPS enabler (Shadow Gem duplication) and the stepping stone to E2. Take it only when continuing past S1 or building the Cerydra carry mode.
3. E2 — The one eidolon that matters in both modes: a multiplicative 1.3x scalar on all allies' Skill DMG plus 30% for her own. The best deep-investment stop for Archer teams and the main-DPS mode alike.

Rin Tohsaka Relics and Stat Targets

Recommended: Genius of Brilliant Stars with City of Converging Stars

Stat targets: CRIT Rate ~100% in-combat, SPD ~140 geared / ~160 in combat

Main stats: Body: CRIT Rate · Feet: SPD · Sphere: Quantum DMG > ATK% · Rope: Energy Regen

Best Rin Tohsaka Light Cones

• Flickering Stars (Best in Slot): Signature. 18% CRIT Rate plus Radiant Crown: whenever any ally consumes 4+ SP in one turn — automatic in Archer rotations — the team gains 20% DEF ignore and she gains 72% Skill DMG for 3 turns. The premium stop for Archer teams and a big spike for the main-DPS mode; E0S0 already does the core job, so it is a luxury rather than a requirement.
• Life Should Be Cast to Flames: The premium alternative for support Rin. Its enemy-side 12% DEF reduction is smaller than her signature's 20% team DEF ignore, but as a debuff it unlocks Divine-Querying Master Smith for 15% teamwide DMG, and the Energy feeds better Ultimate timing. At S5 with the Master Smith pairing its team contribution overtakes the signature at S1 — the rare non-BiS case scored above the BiS S1 baseline.
• Into the Unreachable Veil: Premium utility alternative. 12% CRIT Rate always on, big Skill/Ultimate DMG after her Ultimate, and — because her 160-Energy Ultimate meets the 140+ threshold — an SP refund per Ultimate that adds to the team's surplus. Solid on a support Rin whose Ultimates are timed anyway.
• Eternal Calculus: Standard-pool 5★ with ATK stacking per enemy hit and a SPD boost when hitting 3+ targets — her AoE Ultimate, Enhanced Skill, and joint attack all proc it. The SPD is the point: an option for builds that need her faster to hold the Sparkle turn-order loop.

Best Rin Tohsaka Teams

Gem Burst Sustainless

Rin as the sole carry, cashing out Gem Energy through Enhanced Skill nukes with three amplifiers and no sustain. Cerydra duplicates the Enhanced Skill for free while Sparkle funds the SP the loop devours, and the third slot is flexible. This is the preferred way to run carry Rin — but it remains a ceiling below her Archer pairing, which clears faster at equal investment.

• A-tier: Rin Tohsaka, Cerydra, Sparkle, Mortenax Blade
• A-tier: Rin Tohsaka, Cerydra, Sparkle, Trailblazer • Remembrance
• A-tier: Rin Tohsaka, Cerydra, Sparkle, Tribbie

Gem Burst Sustained

The safety variant of her carry mode: Cerydra and Sparkle keep the gem engine running while a sustain covers long or dangerous fights. Any sustain can fill the slot — Huohuo (energy for her 160-cost Ultimate) and Dan Heng • Permansor Terrae (SP-positive pattern) lead the bucket — but the sustain slot costs the third amplifier the engine wants, so run sustainless when the content allows it.

• A-tier: Rin Tohsaka, Cerydra, Sparkle, Huohuo

Best Rin Tohsaka Teammates

Amplifiers: Cerydra (PARTNER), Sparkle (S), Mortenax Blade (A), Robin • Summeretto (A), Trailblazer • Remembrance (B), Tribbie (B), Welt (B)

Sustains: Huohuo (B), Dan Heng • Permansor Terrae (B), Gallagher (C), Aventurine (C), Lingsha (C), Hyacine (C)