Robin Summeretto (Robin SP) build guide: why her fever state changes everything

Most supports in Honkai: Star Rail want to keep taking turns. Robin Summeretto, also called Robin SP, is the opposite. After she uses her Ultimate, she enters a Fever state and stops acting entirely. Her buffs become effectively permanent, but she can no longer use her Skill or Basic ATK. That one quirk determines everything about her build: what stats to stack, which relics to farm, and even which teammates she works best with.

Robin Summeretto fits into almost any team composition. She can boost either ATK or Crit DMG depending on what your main damage dealer needs. The choice is not automatic. It depends on whether your DPS scales with ATK or not, and getting it wrong means leaving damage on the table.

Robin Summeretto at a glance

Best Light Cone: Rise and Sing
Best relic set: World-Remaking Deliverer
Best planar ornament: Amphoreus, The Eternal Land
Main stats: HP or Crit DMG body, SPD feet, HP or Wind DMG sphere, ERR link rope
Substat priority: SPD > HP% > Crit Rate (until 100%) > Crit DMG
Eidolon priority: E1 > E2 > E6 > E4

Two builds, one character

Robin Summeretto has two distinct build paths, and the right one depends on your main DPS. There is no single best setup.

If your DPS scales with ATK, stack HP on Robin. Her ATK buff scales off her own HP, so more HP means a bigger boost for the team. The stat spread looks like this: HP body, SPD boots, HP sphere, ERR rope.

If your DPS does not scale with ATK, switch to Crit DMG instead. Robin buffs the team’s Crit DMG in this scenario, so you want her own Crit DMG as high as possible. The stat spread changes to: Crit DMG body, SPD boots, DMG Bonus sphere, ERR rope.

There is one exception. Players who run Phainon as their main DPS can drop SPD boots entirely and go double HP. Phainon does not need Robin to act quickly, so the extra survivability wins out.

Best Light Cones for Robin Summeretto

Rise and Sing is Robin’s signature Light Cone and the clear winner. It increases max HP and refunds one Skill Point after her Ultimate. More importantly, the 20 percent SPD buff it grants can become permanent as long as Robin stays in Fever state. That is a lot of value from a single slot.

To Evernight’s Stars is a strong alternative. It boosts HP and lets allied memosprites ignore 20 percent of enemy DEF. It also grants 8 Energy when Robin’s memosprite disappears, though that is a niche benefit you will rarely plan around.

For free-to-play players, Memory’s Curtain Never Falls is the best option. It increases SPD and boosts ally damage. The buff lasts three turns, but Robin cannot refresh it while in Fever state. That means timing matters more than with her signature cone.

If you have none of the above, any Light Cone that boosts SPD or HP will work. Good fallbacks include This Love, Forever, Long May Rainbows Adorn the Sky, and Make Farewells More Beautiful.

Relic sets and planar ornaments

Relic sets

World-Remaking Deliverer is Robin’s best relic set by a wide margin. It increases her HP and raises all allies’ damage by 15 percent. Because Robin stops using Basic ATK and Skill in Fever state, that damage buff is essentially always active. There is no downtime.

Sacerdos’ Relived Ordeal works as a temporary option. It grants 18 percent Crit DMG to an ally after Robin uses her Ultimate. The effect is weaker than World-Remaking Deliverer, but it can fill the gap while you farm the better set.

Messenger Traversing Hackerspace gives extra SPD to the team. The catch is that the buff only lasts one turn and cannot stack. It is a niche pick for speed-tuning specific rotations.

You can also mix two-piece combinations. Pair The Great Scepter of Sun and Thunder, but I’ll keep it short: Use two-piece sets like Longevous Disciple for HP if needed.