Sunday HSR Build 2.7: 50% Summon DMG, 20% CRIT & 4200 HP Guide

Sunday drops as a 5-Star Imaginary Harmony on Dec 4, 2024, in patch 2.7. He pumps ally and summon DMG by 30-50%, hands out +20% CRIT Rate, +20% energy regen, and even advances turns. Chase those Skill, Talent, and Ult traces first. Grab A Grounded Ascent as his LC, and stack Sacerdos' Relived Ordeal relics for 4200+ HP. Absolute must-pull if you're running Jing Yuan summons—his E2? Rotation-defining gold.

Sunday's Kit at a Glance

This guy's built for hypercarry and summon squads—5-Star Imaginary Harmony through and through. His Skill slaps +30% DMG (scaling to 50% on summons) onto a non-Harmony ally or summon, advances their action, and refunds +1 SP. Talent? Straight +20% CRIT Rate for 3 turns. Ultimate cranks +20% Max Energy while dropping Beatified—a juicy CRIT DMG boost (+30%, plus +12% to Sunday's own CRIT DMG, lasting 3 turns).

At Lv 80, expect ATK around 640, DEF 534, HP 4200+. Technique gives allies and summons +50% DMG for 2 turns right off the bat. Basic ATK dishes 100% ATK Imaginary to a single foe. Ascension hits Lv 70 with 6 Fragments Impression and +3 Chordal Mirage.

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Dissecting Sunday's Abilities

Basic ATK: Gleaming Admonition
Single-target 100% ATK Imaginary DMG. Key trace: +40 Ult Energy Regen (Rest Day's Longing). Level it after your cores. Filler duty for those -1 SPD setups.

Skill: Benison of Paper and Rites

Boost a non-Harmony ally or summon with +30% DMG (50% on summons), advance their turn, +1 SP. Picture advancing Jing Yuan for that fat 50% Lightning-Lord spike. Pro tip: Aim at your hypercarry DPS, then layer on Talent's +20% CRIT Rate.

Ultimate: Ode to Caress and Cicatrix
+20% Max Energy to an ally, plus Beatified (CRIT DMG +30%, Sunday's own +12%, 3 turns). E2 amps it with +2 SP post-Ult, SPD tweaks, +30% Beatified DMG, and Ult Lv+2. Hit Ult on summon carriers first. E4 cycles +8 Energy per turn—smooth.

Talent
+20% CRIT Rate for 3 turns; E6 triples stacks, converting 1% excess CRIT Rate to 2% CRIT DMG. Slap it on Jingliu for easy +20%. Priority matches Skill and Ult.

Traces Priority: Where to Spend

Major Traces
Skill = Talent = Ult > Basic. Standouts: Rest Day's Longing (CRIT DMG 5.3-10.7%, Effect RES 4-8%, +40 Ult Energy); Haven in Palm (debuff dispel). Materials grind: 8 Tracks of Destiny, 12 Lost Echo of Shared Wish, 18 Firmament Note, 41 Tatters Thought, 56 Fragments Impression, 58 Shards of Desires, 69 Celestial Section, 139 Heavenly Melody, 3M Credits. Farm Calyx (Rarity 3/4) for Chordal Mirage.

Minor Traces
Pump CRIT DMG and Effect RES—aim 1100+ DEF. Max majors first, then weekly scraps.

Build Path
Skill/Talent/Ult leads, Basic trails. Dump 69 Celestial Section into majors.

Eidolons: How Far to Chase?

E0
Buffs fire on a dime—F2P summon dream. Pull E0S1 for Jing Yuan synergy.

E2
Post-Ult +2 SP, SPD nudge, +30% Beatified DMG, Ult +2 Lv. Keeps endgame rotations humming. (Editor note: This one's a game-changer for hypercarry uptime—I've seen it shave cycles in MoC.)

E6
Triple Talent stacks (+1 turn), excess CRIT Rate converts 1:2 to DMG; bumps E1-5 (Ult+2, Basic+1, Skill/Talent+2, +8 Energy). Stop at E2 unless you're whaling. Test in MoC first.

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Top Light Cones for Sunday

Signature: A Grounded Ascent

24% DMG (stacks to 72%), Energy/SP on Skill/Ult. King for hypercarry/summons. S1 it to 72%, pair with Sacerdos.

F2P Picks
Past and Future S5: 32% DMG to next ally after Skill. But the Battle Isn't Over: 30% DMG post-Ult. Carve the Moon: +10% ATK, 12% CRIT DMG teamwide. Budget? Past and Future all day.

Planar Ornaments
Lushaka or Sprightly Vonwacq + Messenger Traversing Hackerspace. ER at 119.44+ minimum.

Relics & Stats: The Grind

Sets
Sacerdos' Relived Ordeal x4 (or x2 + Messenger x2). Hit 4200+ HP, 1100+ DEF, 190%+ CRIT DMG. Farm HP% body. SPD 134 (-1 builds) or 160+ hyperspeed.

Main/Substats
Body: HP%. Feet: SPD. Sphere/Rope: Energy Regen. Subs: CRIT DMG > Effect RES. ER 119.44+ for Ult spam.

Ornaments
Synergy central with A Grounded; push 160+ SPD.

Killer Team Comps & Synergies

Hypercarry
Sunday + Jingliu + Robin + Huohuo. Advance Jingliu, stack CRIT/DMG (50% summon boost). Skill her first, Ult for energy.

Summon
Sunday + Jing Yuan + Robin + Aventurine: 50% Lightning-Lord juice. Technique + Beatified. E1 Ignore DEF 16-40%.

F2P
Sunday + any DPS + Asta. Duo options: Himeko + Jade + Aventurine. That +20% CRIT Rate? Universal cheese.

Sunday's Rotation & Flow

2-Turn Cycle
Technique (+50% DMG, 2 turns). Skill advance DPS/summon (+30-50% DMG +20% CRIT). Ult for energy/Beatified. Talent refresh. -1 SPD or hyperspeed; E2/E4 handles SP/Energy.

Damage shines: 72% hypercarry peaks via LC, AoE summon amps. Non-Harmony focus; traces dispel debuffs.

Common pitfalls? Skipping E6 too soon (don't), ER under 119%, Skilling Harmony allies. Ever wonder why your Ult fizzles?

Sunday vs. the Harmony Pack

Ruan Mei edges Break, but Sunday owns summons/hypercarry—20% CRIT Rate + scaling CRIT DMG, per data dives. Sparkle/Tingyun match energy/SP, but his +50% summon DMG pulls ahead. Top 3.0 Harmony, no cap. S-tier, especially Penacony summons. (My take: He's the summon whisperer we've craved.)

Verdict: Pull or Pass?

F2P
E0 + Past and Future crushes. Jing Yuan first. Lv 20: 5 Tatters, 4k Credits. Lv 70: Full kit.

Whale
E2 locks rotations; E6 CRIT wizardry. Sig LC. MoC/Apocalyptic Shadow loves him.

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FAQ

What's Sunday's kit in Honkai: Star Rail?
Skill: Advance ally +30-50% DMG +1 SP. Talent: +20% CRIT Rate, 3 turns. Ult: +20% Energy + Beatified CRIT DMG.

Must-pull in HSR 3.0?
Yep—for summons/hypercarry like Jing Yuan. Best Harmony hands down.

Best Sunday build?
A Grounded Ascent LC, Sacerdos x4, 4200+ HP, 160 SPD, Skill/Talent/Ult traces.

Top teams?
Jing Yuan + Robin + Aventurine; Jingliu + Huohuo; F2P + Asta.

Relics and LCs?
Sacerdos' Relived Ordeal; A Grounded Ascent > Past and Future.

Rotation guide?
Technique > Skill DPS > Ult > Talent; -1 SPD + E2 cycle.