Sunday is one of the most powerful support characters in Honkai Star Rail. As a 5-star Imaginary character following the Path of Harmony, he brings incredible buffing potential that can transform any hypercarry team. Many players consider him the best support in the game due to his ability to advance actions and boost damage output. This guide covers everything you need to build Sunday properly and maximize his support capabilities.
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About Sunday
Sunday works by advancing both allies and their summons using his Skill. His Skill grants 100% Action Advance, meaning the target acts immediately after Sunday. This gives DPS characters double actions and makes summon-based characters incredibly powerful.
His Ultimate regenerates Energy for one ally and applies “The Beatified” status. This status increases CRIT DMG based on Sunday’s own CRIT DMG stat. The buff lasts for 3 turns and only affects the most recent target.
The key to Sunday’s power is his bonus traces. He starts battles with 25 Energy and restores 1 Skill Point when using his Skill on a Beatified target. This makes him SP-positive after using his Ultimate once. He also provides a 20% CRIT Rate buff that lasts 3 turns and removes 1 debuff when using his Skill.
Best Light Cones for Sunday
Choosing the right light cone improves Sunday’s energy regeneration and buffing power. Here are the best options:
| Light Cone | Rarity | Why It’s Good |
| A Grounded Ascent | 5-Star | His signature with energy regeneration and ally damage buffs |
| Past and Future | 4-Star | Best 4-star option with energy and damage boost effects |
| Carve the Moon, Weave the Clouds | 4-Star | Provides energy regeneration and CRIT boosts |
| Chorus | 3-Star | Best free option that always triggers due to instant action advance |
Best Relics for Sunday
Relics are crucial for building Sunday correctly. Here’s what you need:
Best Relic Set
The 4 piece Sacerdos’ Relived Ordeal is Sunday’s best relic set. The 2 piece bonus gives 6% CRIT DMG. The 4 piece bonus increases an ally’s CRIT DMG by 18% for 2 turns when Sunday uses his Skill or Ultimate on them. This effect stacks up to 2 times for a total of 36% CRIT DMG.
The 4 piece Eagle of Twilight Line is an alternative that provides Wind DMG and Action Advance. This set advances Sunday’s action by 25% after using his Ultimate, giving him more turns.
Best Planar Ornaments
For planar ornaments, use Lushaka, the Sunken Seas for Energy Regeneration and ATK bonuses. This set provides 5% Energy Regeneration and increases the ATK of the first character in the team lineup by 12%.
Broken Keel is another option that provides 10% Effect Resistance and increases all allies’ CRIT DMG by 10% when Sunday has 30% or higher Effect Resistance.
Sprightly Vonwacq works well for hyperspeed builds. It provides 5% Energy Regeneration and advances Sunday’s action by 40% at battle start when his Speed reaches 120 or higher.
Main Stats and Substats
Focus on these stats for maximum effectiveness:
Main Stats:
- Body: CRIT DMG
- Feet: Speed
- Planar Sphere: HP%
- Link Rope: Energy Regeneration
Substats Priority:
- CRIT DMG (aim for 200% or more)
- Effect Resistance (50% or higher)
- HP%
- DEF%
- Speed
Speed Tuning Guide
Sunday has two main speed build options:
-1 Speed Build: Set Sunday 1 to 2 speed slower than your main DPS character. For example, if your DPS has 135 Speed, build Sunday with 134 Speed. This allows the DPS to act first, then Sunday immediately advances them for double actions. This rotation continues throughout the battle.
Hyperspeed Build: Build Sunday to 160 Speed or higher. This permanently drags your DPS up to Sunday’s speed level. With this build, you can completely ignore Speed stats on your DPS and focus entirely on damage stats instead.
The -1 Speed Build is the most common and usually most powerful option. The Hyperspeed Build works better for specific DPS characters who benefit more from other stats.
Best Team Compositions
Sunday works in many team combinations. Here are some of the best:
- Premium Summon Team: Sunday + Jing Yuan + Robin + Aventurine
- Alternative Summon Team: Sunday + Topaz + Robin + sustain
- Hypercarry Team 1: Sunday + Acheron + Pela + sustain
- Hypercarry Team 2: Sunday + Seele + Sparkle + sustain
- New Meta Team: Sunday + The Herta + Robin + sustain
Trace Priority
Level Sunday’s traces in this order:
- Skill, Ultimate, and Talent (level all three together)
- Basic Attack (lowest priority)
For bonus abilities, prioritize A2 first, then A4, and finally A6. All three bonus traces are important for making Sunday SP-positive and maximizing his energy regeneration.
Eidolons Worth Considering
Sunday’s Eidolons are powerful but not necessary. His E1 allows him and allies to ignore DEF when dealing damage. His E2 increases The Beatified damage by 30%. However, Sunday functions perfectly well at E0 with proper team building and speed tuning.
Sunday is a must-pull character for players who enjoy hypercarry team playstyles. His ability to advance actions and provide massive buffs makes him viable against any content in the game.
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