Rin Tohsaka arrives in Honkai: Star Rail version 4.4 as a 5-star Quantum Erudition character from the Fate/stay night collaboration. She functions as a flexible damage dealer who converts team Skill Point activity into Gem Energy, then unleashes powerful enhanced Skills packed with bounce damage. She pairs exceptionally well with Archer, enabling joint follow-up attacks and Skill Point recovery while also performing solidly as a main DPS in other setups.
With her banner live, many players face the classic vertical investment question after securing the base character: go for Eidolon 1 or her signature Light Cone at Superimposition 1? Both options improve her performance, but they emphasize different strengths. Here is a clear breakdown to help you decide.
Quick Look at Her Core Playstyle
Rin builds Gem Energy whenever allies spend or recover Skill Points. Once she reaches enough energy (or the team has high Skill Point counts), her Skill upgrades into Second Magic Experiment, an AoE opener followed by numerous random single-target hits. Her Ultimate restores a Skill Point, applies vulnerability, and feeds her more Gem Energy. With Archer on the team, she triggers a strong joint attack under certain Skill Point conditions and shares some of her entry buffs.
She works best in Skill Point-heavy teams and scales with both personal damage and team support.
What E1 (Zelretch's Apprentice) Offers
E1 activates when an Enhanced Skill consumes 30 or more Gem Energy. Rin gains an equal amount of Shadow Gem. While she holds Shadow Gem, her next Skill becomes the enhanced version for free: it consumes the Shadow Gem instead, skips the usual Skill Point-to-Gem conversion, and costs no Gem Energy.
This creates smoother rotations and extra high-damage Enhanced Skills without draining resources as heavily. It primarily boosts Rin’s personal damage output and makes her more comfortable as a main DPS or in longer fights where resource management matters. Community and early calculations often put the personal DPS gain in a moderate range (around 10-15% in Archer teams, higher when she carries more of the damage load).
E1 feels like a quality-of-life and personal power spike rather than a full team multiplier.
What S1 (Flickering Stars) Offers
Her signature Light Cone, Flickering Stars, is an Erudition weapon with strong base stats (approximately 846 HP, 635 ATK, and 529 DEF at level 80). At Superimposition 1 it raises the wearer’s CRIT Rate (starting around 18%) and provides a large Skill DMG bonus. The key passive triggers when any ally consumes 4 or more Skill Points in a single turn: Rin gains Radiant Crown for 3 turns. During this, all allies ignore a portion of the target’s DEF (around 20% at base values in current data), and Rin’s own Skill DMG receives an additional substantial boost.
Because the DEF ignore is team-wide, it benefits Archer (or any other Skill Point spenders) significantly. The CRIT Rate and Skill DMG help Rin herself, while the trigger condition aligns perfectly with the high-SP playstyle her kit encourages. Relative performance guides often rank it as her best-in-slot by a clear margin over strong alternatives like Into the Unreachable Veil.
S1 improves both personal output and team damage, especially in Archer-focused compositions.
Direct Comparison and Recommendation
Choose S1 first if you play her with Archer or in SP-hungry teams. The team-wide DEF ignore amplifies Archer’s damage and the rest of the squad, while the Skill DMG and CRIT Rate keep Rin relevant. Multiple player discussions and early theorycrafting favor S1 for overall team performance and for accounts that lack strong Erudition Light Cones.
Choose E1 first if you plan to run her as a main DPS without heavy Archer reliance, or if you already have a competitive Erudition Light Cone. The free Enhanced Skills reduce resource pressure and raise her personal ceiling more directly. It also serves as a stepping stone toward higher Eidolons (E2 in particular further buffs Skill DMG for the whole team).
Account and pull factors matter. If your jade count is limited, S1 often delivers broader value per pull because Light Cones are easier to obtain on the weapon banner and the team benefit is immediate. If you already own strong substitutes (such as The Herta’s signature or high-superimposition options) and want pure personal power, E1 becomes more attractive. Pure support-oriented builds can stay at E0S0 or E0S1 and still perform well.
In most standard Archer + Rin teams, S1 edges out as the higher priority for the average player. If your goal is maximizing Rin’s own damage contribution or preparing for future vertical investment, E1 is the stronger personal upgrade.
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