Sunday Build Guide HSR – Best Relics, Light Cones, Teams & Eidolons

• Sunday is a 5-star Imaginary Harmony support who grants 100% Action Advance to any ally — and uniquely, to their summon at the same time.
• His Skill also boosts the target’s DMG dealt by 30%, jumping to 80% total if the target has a summon.
• His Ultimate restores 20% of an ally’s Max Energy and applies The Beatified — a CRIT DMG buff that scales with Sunday’s own CRIT DMG stat for up to 3 turns.
• Best Light Cone: A Grounded Ascent (his signature). Without it, you need an Energy Regeneration Rope to maintain consistent rotation.
• Best Relics: Sacerdos’ Relived Ordeal (4-piece) + Lushaka, the Sunken Seas (Planar Ornament).
• Two speed builds: -1 Build (Sunday at 134 SPD, DPS at 135+) or Hyperspeed Build (Sunday at 160+ SPD for action-advance looping).
• Best DPS partners: Aglaea, Jing Yuan, Phainon, Mydei, and Yunli.
• E1 is the first investment priority — it adds 16% DEF ignore for all targets and a transformative 40% DEF ignore for summons.
• Sunday’s Action Advance does not work on other Harmony characters. He cannot advance Bronya, Robin, or other supports.
• Sunday debuted in Version 2.7 and last ran as a rerun in Version 3.4. Watch for future reruns.

Who Is Sunday in Honkai Star Rail?

Sunday is a 5-star Imaginary character following the Path of Harmony in Honkai Star Rail. He debuted in Version 2.7 and is widely regarded as the best single-target buffer in the game. As of patch 4.3, he remains one of the most contested supports on any account — teams built around summon-based DPS characters almost always want him, and even non-summon hypercarries benefit enormously from his action advance and CRIT DMG scaling.

His character lore describes him as a traveler whose wings were clipped. He is a deeply thoughtful, complex figure whose quiet strength and idealism are reflected in his support playstyle — he does not deal the damage himself, but he makes everyone around him hit harder and act faster. In gameplay terms, Sunday does something no other Harmony character does: he advances both a character and their summon simultaneously, solving the core weakness of slow-acting summon DPS like Jing Yuan’s Lightning-Lord in one clean kit.

Sunday’s most recent rerun was in Version 3.4 (July 2025), alongside Tribbie and Sparkle. Keep an eye on future banner announcements. For all current version events and patch details, check the official HoYoverse Honkai Star Rail news page.

Sunday Kit Overview – How His Abilities Work

Sunday’s kit is centered around two things: action economy and CRIT DMG amplification. His Skill accelerates a chosen ally instantly. His Ultimate loads them with a powerful CRIT DMG buff that scales with Sunday’s own stat investment. Together, these two abilities define his role as the premier single-target Harmony buffer in the game.

Basic Attack – One-Way Ticket

Deals Imaginary DMG equal to 100% of Sunday’s ATK to a single enemy. You will rarely use this in practice. It exists mainly to generate a small amount of Energy when Skill Point economy is healthy. In most team rotations, Sunday spends his turns using his Skill or Ultimate rather than attacking.

Skill – Benedicite

This is Sunday’s defining ability. It targets one ally character and their summon simultaneously and:

• Grants 100% Action Advance — the target acts immediately after Sunday’s turn.
• Increases the target’s DMG dealt by 30% for 2 turns.
• If the target has a summon, the DMG boost increases by an additional 50%, totaling 80% DMG increase for 2 turns.
• Forces the summon to take action immediately after the ally, regardless of its original SPD.
• Removes 1 debuff from the target ally.

The 100% Action Advance is what makes Sunday special. Every turn he uses Skill, the chosen DPS effectively takes an extra turn ahead of schedule. Summon characters like Jing Yuan, Aglaea, and Topaz benefit even more because their summons also advance immediately — fixing the core speed problem that made summon units historically awkward. One important limit: Sunday cannot advance other Harmony characters. If you target Bronya, Robin, or any Harmony support, the Action Advance does not trigger. Always point his Skill at DPS characters or their summons.

Ultimate – Reveille

Targets one ally and applies The Beatified state, which provides:

• Restores 20% of the target’s Max Energy (minimum 40 Energy). This helps DPS characters reach their own Ultimates faster.
• Increases the target’s (and their summon’s) CRIT DMG by an amount equal to 30% of Sunday’s CRIT DMG plus 12%. This means the more CRIT DMG Sunday himself has, the stronger the buff he applies.
• The Beatified state lasts for 3 turns, ticking down on Sunday’s turns — not the buffed character’s turns. This is crucial for uptime: if you speed-tune Sunday correctly so he acts less frequently than the DPS, the buff stays active for more of the DPS’s turns.

One honest limitation: the 20% Energy restore is wasted on characters without conventional Energy mechanics. Characters like Feixiao, E0 Acheron, and Castorice do not use standard Energy. Sunday still buffs these characters with CRIT DMG through The Beatified, but the Energy component is lost. Keep this in mind when building teams.

Talent – Coreflame-Igniting Verse

When Sunday uses his Skill or Ultimate on an ally, Sunday gives them a 20% CRIT Rate boost lasting for 3 turns. This is a passive on-use bonus — every Skill and Ultimate application refreshes the CRIT Rate buff on the target. Combined with The Beatified CRIT DMG boost, Sunday’s full buff package covers both CRIT Rate and CRIT DMG in a single rotation, making it easier to hit consistent crits on the buffed DPS without over-investing in CRIT Rate on their relic build.

Technique – Prism Promenade

Sunday’s Technique applies a 2-turn buff to a chosen ally at battle start, increasing their DMG dealt. This pre-battle buff can be extended to cover Phainon’s first Ultimate transformation window if timed correctly. Always use the Technique before entering fights to grab the free DMG buff on your primary DPS from the very first action.

Sunday Best Light Cones in HSR

Sunday follows the Path of Harmony. Only Harmony path Light Cones trigger their passive effects on him. His signature Light Cone is genuinely transformative — it solves his main Energy issue and provides SP economy, two things that otherwise require precise stat tuning to manage without it.

A Grounded Ascent (Signature – Best in Slot)

Sunday’s 5-star signature is the best-in-slot option and the single biggest power spike for him. After Sunday uses his Skill or Ultimate on an ally, he regenerates 8 Energy per use. The ally also gains 1 stack of Hymn (up to 3 stacks), each increasing their DMG dealt by 24% at S1 — a separate multiplicative damage layer on top of all other buffs. After every 2 uses of Skill or Ultimate on the same ally, Sunday recovers 1 Skill Point. The combined effect: Sunday becomes SP-positive (not just neutral), his ally gains a significant ongoing DMG multiplier, and his Energy issues disappear entirely — enabling consistent 3-turn Ultimate rotations without needing an Energy Regeneration Rope. This frees his Link Rope slot for ATK% or other offensive stats. If you have Sunday, his signature is the first thing to pursue.

But the Battle Isn’t Over (Bronya’s Signature – Strong 5-Star Alternative)

The next best option, obtainable from the standard banner or character selectors. It regenerates 10 Energy for Sunday on Skill use, provides a 1-turn 50% DMG boost to the targeted ally after Sunday uses his Ultimate, and recovers 1 Skill Point every 2 Ultimates. The Energy regen keeps Sunday’s Ultimate cycling consistently. The 50% DMG boost is a solid offensive contribution but lower ceiling than the signature’s Hymn stacking. This is the recommended substitute for players without the signature, and it is available without limited pulls.

Past and Future (4-Star F2P)

The best accessible 4-star option for Sunday. After the wearer uses their Skill, the next ally to take action gains a 16% DMG boost. On Sunday, this effectively provides a passive DMG increase to the ally he just advanced. Use this if you have neither of the 5-star options and run it at high Superimposition for best results.

Planetary Rendezvous (4-Star Alternative)

Provides an ATK boost for all allies of the same element as the wearer. Sunday is Imaginary, so this benefits Imaginary DPS like Dan Heng • Imbibitor Lunae. Niche but useful in mono-Imaginary team setups where no better option is available.

Sunday Best Relics in HSR

Sunday is a support, so his relic goals are different from DPS characters. You are not building for personal damage — you are building enough CRIT DMG to make his Beatified buff strong, enough Speed to hit rotation breakpoints, and enough Energy Regeneration (if no signature LC) to keep his Ultimate cycling every 3 turns.

Best 4-Piece Relic Set: Sacerdos’ Relived Ordeal

This is Sunday’s best relic set and the clear recommendation. The 2-piece bonus gives a direct SPD increase, helping him reach the 134 breakpoint for the standard -1 build without as many SPD substats. The 4-piece is the key: when Sunday uses his Skill or Ultimate on an ally, that ally gains a significant CRIT DMG boost for 2 turns. This bonus stacks with The Beatified’s CRIT DMG buff and Sunday’s own Talent CRIT Rate boost, creating a powerful combined buff package with every rotation. Always farm this set specifically for Sunday.

Alternative: 2-Piece Sacerdos + 2-Piece Messenger Traversing Hackerspace

If you do not have a clean 4-piece Sacerdos set with good substats, running a 2+2 combination is a solid placeholder. Sacerdos 2-piece gives SPD. Messenger 2-piece gives additional SPD. This double SPD approach can make hitting the 134 breakpoint considerably easier with less SPD investment in substats, freeing those rolls for CRIT DMG. Use this while farming for a complete Sacerdos set.

Best Planar Ornament: Lushaka, the Sunken Seas

Sunday’s best Planar Ornament. It gives Energy Regeneration Rate, which helps maintain his Ultimate cycle when not running the signature Light Cone. It also boosts an ally’s ATK when Sunday is not the lead character — which is almost always true in practice, since Sunday leads his Skill and Ultimate toward DPS teammates rather than himself. The ATK contribution is a meaningful secondary bonus for energy-scaling DPS characters.

Alternative Planar Ornament: Penacony, Land of the Dreams

A usable alternative for Sunday if you are running him in an Imaginary-heavy team. The DMG bonus applies to allies of the same element as Sunday. Works in Imaginary mono-comps or when paired with Dan Heng • Imbibitor Lunae. Use Lushaka as the primary target in most cases.

Relic Main Stats to Target

• Head: HP (fixed)
• Hands: ATK (fixed)
• Body: CRIT DMG — this is the most important main stat. Sunday’s Beatified buff scales with his own CRIT DMG, so higher CRIT DMG on Sunday translates directly into a larger buff for the DPS he targets.
• Feet: SPD — aim for 134+ for the standard -1 build, or push toward 160+ for the Hyperspeed build (see below).
• Planar Sphere: HP% or DEF% — Sunday has low base HP (800) and needs survivability stats to avoid being knocked down, which would dispel The Beatified on the target.
• Link Rope: Energy Regeneration Rate (if not running signature LC) — you need around 119.44% ERR to maintain a 3-turn Ultimate cycle without the signature. ATK% if running signature LC.

Key Substat Priority

CRIT DMG is the top priority for offensive power — aim for 180–220%+. SPD substats are critical for hitting rotation breakpoints. HP and DEF substats help prevent Sunday from dying, which would dispel his buffs. Avoid CRIT Rate on Sunday — he rarely attacks, and CRIT Rate on him has no value for his support function.

Stat Targets

• CRIT DMG: 180–220%+ (the higher, the stronger The Beatified buff)
• SPD: 134+ for -1 build, or 160+ for Hyperspeed build
• Energy Regen: 119.44%+ if not using signature LC
• HP: 4,200+ for survivability
• DEF: 1,100+ to avoid fragility

Sunday Speed Tuning – -1 Build vs Hyperspeed Build

Sunday has two main speed strategies. Choosing the right one depends on your DPS character and team composition.

The -1 Build (Standard – Most Common)

In this setup, Sunday runs at 1 SPD lower than the DPS he is supporting. The DPS should be at 135+ SPD, and Sunday at 134+. The result: the DPS takes a turn, then Sunday acts, then the DPS acts again — creating two DPS turns back-to-back in quick succession. Sunday’s Skill advances the DPS immediately, the DPS takes another turn with full buffs active, and the cycle repeats. This is the cleanest and most reliable rotation for the vast majority of teams. It is predictable, easy to tune, and works in all endgame content.

The Hyperspeed Build (Advanced)

In this setup, Sunday pushes his own SPD as high as possible — ideally 160+ SPD in combat — using the Eagle of Twilight relic set and Dance! Dance! Dance! Light Cone stacks. The principle is similar to how Sparkle plays at high speed: Sunday acts so frequently that the DPS effectively gets extra turns through pure Action Advance frequency, without needing the DPS to build SPD at all. This is valuable for DPS characters who strongly prefer ATK% or other offensive boots over SPD — like Yunli, who gets most of her damage from out-of-turn counters. The Hyperspeed build requires more relic investment to reach the speed threshold and is harder to execute consistently, but the ceiling is higher in the right team. Only chase this build after your core stats (CRIT DMG, survivability) are solid first.

Sunday Best Teams in HSR 4.3

Sunday is a single-target buffer by design. He shines most in teams built around one primary DPS who takes many turns and benefits from per-turn CRIT/DMG buffs. He is uniquely powerful for summon-based DPS because he is the only support in the game who can advance both a character and their summon simultaneously.

Summon Team: Sunday / Aglaea / Robin / Huohuo

This is one of Sunday’s best teams in the current meta. Aglaea is a Lightning Remembrance DPS who spends an enormous 350-Energy Ultimate. She needs massive Energy support to sustain her rotation, and Sunday’s 20% Max Energy restore through The Beatified is exactly what she needs. Sunday also advances both Aglaea and her memosprite Garmentmaker simultaneously, and all of his CRIT Rate and CRIT DMG buffs apply to both the character and the summon. Robin provides team-wide ATK and DMG buffs. Huohuo handles healing and provides additional Energy regeneration. This team creates near-constant high-damage turns from Aglaea in MoC and AS.

Classic Summon Team: Sunday / Jing Yuan / Robin / Aventurine

Sunday is considered the best support for Jing Yuan in the entire game. Before Sunday, Jing Yuan’s biggest weakness was his Lightning-Lord: slow, vulnerable to CC, and often acting after enemies were already dead. Sunday’s Skill advances both Jing Yuan and Lightning-Lord simultaneously, completely solving every one of those problems. On Jing Yuan’s turns, he builds Lightning-Lord stacks. Sunday then fires — and Lightning-Lord acts immediately after Jing Yuan with full stacks and the 80% summon DMG buff active. Robin and Aventurine provide damage amplification and survivability. Speed-tune Sunday to 1 SPD below Jing Yuan for clean rotations.

Hypercarry Team: Sunday / Phainon / Bronya / Tingyun

Sunday is one of Phainon‘s top supports. He generates Coreflame for Phainon through his Skill (1 Coreflame), Ultimate (2 Coreflame), and the Action Advance forcing extra turns (2 additional Coreflame). His 20% CRIT Rate buff fills a critical gap in Phainon’s build — most Phainon builds are stacked with CRIT DMG from team buffs, making Sunday’s CRIT Rate contribution especially valuable. Critically, Sunday’s 2-turn buffs are snapshot into Phainon’s transformation and persist through all 8 Khaslana enhanced turns. Bronya provides a second Action Advance and additional CRIT DMG. Tingyun handles Energy and ATK buffs.

Hypercarry Team: Sunday / Mydei / Tribbie / Gallagher

Mydei is a Destruction HP-scaling DPS with a large Energy pool. Sunday solves his Energy cost challenge with 20% Max Energy restoration and keeps his turns flowing with Action Advance. Sunday’s buffs are not tied to ATK, which makes them especially strong for HP-scaling DPS like Mydei. Tribbie provides RES PEN and DMG Taken debuffs. Gallagher handles sustain with efficient healing. This is a strong and accessible team that works across all endgame modes.

Alternative DPS Partners Worth Noting

• Yunli – Large Energy pool and out-of-turn counter-based DPS. Sunday’s Energy restore and buff uptime across multiple turns synergize well with her reactive playstyle.
• Blade – HP-scaling Destruction DPS who benefits from Sunday’s DMG% and CRIT buffs without needing ATK scaling.
• Dan Heng • Imbibitor Lunae – SP-hungry DPS who benefits from Sunday’s SP-positive rotation, especially with the signature LC.
• Dan Heng • Permansor Terrae – His Bondmate-attached summon receives the full 80% summon DMG buff from Sunday’s Skill, making him effective even without a native summon.
• Acheron – Sunday can replace Sparkle in some Acheron builds to provide consistent action advance and CRIT buffs. Note that the Energy restore is wasted on E0 Acheron, but CRIT/DMG buffs still apply.

Sunday Trace Priority

Sunday is a support, so his trace priority is different from DPS characters. You are investing in the abilities that directly improve the buffs he delivers to teammates.

• Skill – Level first. His Skill is his most-used ability and the source of the 100% Action Advance. Higher Skill level increases the DMG boost percentage and improves the summon-specific bonus. This is your primary tool every rotation.
• Ultimate – Level alongside Skill. The Beatified’s CRIT DMG buff scales with Ultimate level. Higher Ultimate level means stronger CRIT DMG buffs applied to the target. Level this in tandem with Skill since both are used every rotation.
• Talent – Level third. The Talent governs the 20% CRIT Rate buff applied on Skill and Ultimate use. Leveling it increases the CRIT Rate percentage. Slightly lower priority than Skill and Ultimate since the CRIT Rate boost is a flat value rather than scaling, but still meaningful.
• Basic Attack – Last. You almost never use Sunday’s Basic Attack in normal rotation. Leave this at 1 or level it minimally with leftover materials.

Sunday Eidolons – Which Ones Are Worth It?

Sunday is functional and strong at E0, especially with his signature Light Cone. His Eidolons improve him progressively, with E1 being the most impactful early investment.

E1 – Best Value Eidolon (Priority Investment)

E1 is the first thing to pursue after his signature Light Cone. It adds two effects: when Sunday uses his Skill, the target and their summon can ignore 16% of enemy DEF (for non-summon characters) or 40% DEF (for summons and their related attacks) for 2 turns. The 40% DEF ignore for summons is a truly transformative bonus — it dramatically increases Jing Yuan’s Lightning-Lord damage, Aglaea’s Garmentmaker output, and any other summon DPS attached to Sunday. Even the 16% DEF ignore for standard DPS characters is a solid team-wide penetration bonus. Additionally, after the first use of Ultimate, Sunday recovers 2 Skill Points. E1 makes Sunday meaningfully better for every DPS he supports, and significantly better for summon teams.

E2 – Strong Rotation and Damage Upgrade

E2 adds 30% DMG to the Beatified state and recovers 2 Skill Points after the first Ultimate use. The extra Skill Point economy effectively makes Sunday slightly SP-positive at E2 even without the signature, and the DMG boost to The Beatified state stacks with all other buffs. A meaningful upgrade for dedicated Sunday users but not as transformative as E1 for most team contexts.

E4 – Energy Independence

E4 generates 8 Energy for Sunday at the start of his turn. This effectively removes Energy concerns entirely — Sunday no longer needs an Energy Regeneration Rope or precise tuning to maintain Ultimate cycles. This frees his Link Rope slot for ATK% or other stats, providing indirect build flexibility. Valuable at deeper investment but expensive to reach.

E6 – Maximum Output

E6 converts excess CRIT Rate beyond 100% into CRIT DMG at a 1:2 ratio and provides a full 3-stack Talent CRIT Rate bonus instantly. In practice, this means Sunday can build CRIT Rate more freely without worrying about over-capping, since overflow converts directly into CRIT DMG which then scales his Beatified buff. A significant ceiling raise for fully invested Sunday but prohibitively expensive for most players.

Sunday Rotation Guide – How to Play Him

Sunday’s rotation is clean and predictable once you understand the goal: keep The Beatified active on your DPS as much as possible while using your Skill on every available turn.

Standard 3-Turn Rotation (With Signature LC or ERR Rope)

The ideal rotation runs on a 3-turn cycle:

• Turn 1: Use Ultimate on the DPS to apply The Beatified (CRIT DMG buff + Energy restore). The DPS gains CRIT DMG and can immediately use their own Ultimate if Energy allows.
• Turn 2: Use Skill on the DPS — 100% Action Advance, DMG boost, and CRIT Rate refresh. The DPS acts immediately. If they have a summon, it also acts now.
• Turn 3: Use Skill again on the DPS — another Action Advance. At this point The Beatified should still be active (it decrements on Sunday’s turn, so with 3-turn duration and 3-turn cycle, it just about maintains uptime with good tuning).
• Then Ultimate fires again to re-apply The Beatified, and the cycle repeats.

With the signature LC’s Hymn stacks, each Skill and Ultimate use adds a Hymn stack on the DPS (up to 3 stacks of 24% DMG each). By turn 3 of the cycle, the DPS has 3 Hymn stacks (72% DMG) plus full CRIT Rate and CRIT DMG buffs from Sunday active simultaneously.

Using the Technique

Use Sunday’s Technique before entering any fight. It applies a 2-turn DMG buff to a chosen ally at battle start. For Phainon specifically, this Technique buff can be timed to persist through his first Khaslana transformation window — apply it at the right moment and the pre-battle buff extends into the transformation.

When Energy is Tight

Without the signature LC, Sunday needs 119.44%+ Energy Regeneration Rate on his Link Rope to maintain 3-turn Ultimate cycles. If you find his Ultimate is slightly off-schedule, check whether your ERR stat meets that threshold. SPD tuning also matters — Sunday needs to be acting at roughly the right pace relative to the DPS for buff uptime to stay consistent.

Should You Pull Sunday in HSR 4.3?

Yes — Sunday is one of the safest and most versatile support investments in the entire game. He is rated T1 in the current 4.3 meta and remains essential for specific team archetypes, particularly summon DPS teams where he is functionally irreplaceable. No other character in the game can advance both a DPS character and their summon simultaneously with a single Skill use. That unique function has aged extremely well and continues to grow in value as new summon DPS characters are released.

Even outside of summon teams, Sunday’s impact is significant. His 100% Action Advance gives any hypercarry effective extra turns per cycle. His Beatified CRIT DMG buff scales with stat investment, making it a flexible offensive tool for virtually any CRIT-based DPS. And his Skill’s debuff cleanse adds a layer of utility that helps teams without a dedicated dispeller.

The main consideration is the signature Light Cone. Without it, Sunday requires an Energy Regeneration Rope and careful SPD tuning to maintain clean rotations. With it, he becomes SP-positive, his Energy concerns vanish, and his Hymn stacking adds an additional multiplicative damage layer on the buffed DPS. If you pull Sunday, going for his signature on the same banner is strongly recommended.

Sunday is most worth pulling if you own or plan to pull summon-based DPS characters like Aglaea or Jing Yuan. He is also excellent alongside Phainon, Mydei, and other turn-hungry hypercarries. If your roster lacks a strong single-target buffer for boss content, Sunday is the answer.

For other top-tier Harmony supports to consider, check our guides for Robin, Bronya, Ruan Mei, Sparkle, and Tribbie. For the DPS characters who benefit most from Sunday’s kit, see our guides for Aglaea, Jing Yuan, Phainon, and Mydei.

Sunday Build Guide HSR – Quick Summary

• Role: Action Advance Support / Harmony Buffer
• Element: Imaginary
• Path: Harmony
• Best Light Cone: A Grounded Ascent (signature) > But the Battle Isn’t Over (Bronya’s sig, standard banner) > Past and Future (4-star)
• Best 4-Piece Relic Set: Sacerdos’ Relived Ordeal (or 2-piece Sacerdos + 2-piece Messenger while farming)
• Best Planar Ornament: Lushaka, the Sunken Seas
• Body Main Stat: CRIT DMG
• Feet Main Stat: SPD
• Sphere Main Stat: HP% or DEF% (survivability)
• Rope Main Stat: Energy Regeneration Rate (without signature) / ATK% (with signature)
• Stat Goals: 180–220%+ CRIT DMG, 134+ SPD (-1 build) or 160+ SPD (Hyperspeed build), 119.44%+ ERR without sig, 4,200+ HP
• Trace Priority: Skill = Ultimate > Talent > Basic Attack
• First Investment Target: E1 (16% DEF ignore standard / 40% DEF ignore summons). Signature LC should come before E1 for most accounts.
• Best Teams: Aglaea / Jing Yuan / Phainon / Mydei + Sunday as primary buffer
• Critical Rule: Action Advance does not work on other Harmony characters. Always target DPS characters or their summons with his Skill.
• Endgame Tier: T1 support, essential for summon DPS teams, strong in all endgame modes

For full skill calculations, complete Eidolon breakdowns, and team simulation data, visit the complete Sunday guide on GamingProMax.

For official version notes and event details, check the HoYoverse official Honkai Star Rail news page.