5-star Harmony character in HSR, Sunday excels at empowering your entire squad with substantial ATK increases, damage amplification, and CRIT DMG boosts, all without demanding excessive resources. To fully unlock his capabilities, prioritize his equipment and team synergy.
This guide outlines the key build strategies for Sunday in a clear, easy-to-follow structure. Prepare for his arrival by stocking up on Stellar Jades via Enjoygm’s secure platform!
Who is Sunday?
Sunday is a 5-star Imaginary Harmony character in Honkai: Star Rail. As a Harmony unit, he excels as a powerful single-target support, providing substantial DMG Boost, CRIT Rate increase, CRIT DMG enhancement, and Energy regeneration. His most valuable capability lies in his Skill’s action-forwarding effect, which simultaneously advances both the target ally and their summons. This significantly optimizes the damage rhythm of summon-based DPS characters, enabling both the main unit and their summons to act with high frequency and unleash continuous damage.
- Strengths
Powerful Single-Target Catalyst: His Skill enables both a designated ally and their summon to take action immediately (Action Advance), while granting a substantial DMG boost (up to 80%). This allows core DPS units to unleash their damage in a rapid burst sequence.
Valuable Energy and CRIT Support: His Ultimate regenerates a significant amount of Energy (20% of max) for an ally and applies the “The Beatified” state, which provides a massive CRIT DMG increase based on Sunday’s own CRIT DMG. Furthermore, his Talent offers a reliable CRIT Rate boost, making him a comprehensive offensive support.
Optimized Summon Synergy: The Action Advance from his Skill affects both the target character and their summon simultaneously. This dramatically improves the damage rhythm for summon-reliant DPS characters (e.g., Clara, Physical Trailblazer), making him an ideal partner for such teams.
- Weaknesses
Pressure to Maintain “The Beatified”: The “The Beatified” state applied by his Ultimate decreases its duration at the start of each of Sunday’s own turns and is dispelled entirely if he is knocked down. This places demands on the team’s survivability and overall action speed.
Core Function Relies on Ultimate: The crucial “The Beatified” state and its linked Skill Point recovery mechanic are dependent on his Ultimate. While its 130 Energy cost is not the highest, ensuring its consistent uptime is crucial for maintaining his support rhythm.
Action Restriction on Harmony Teammates: The “immediate action” effect from his Skill cannot be triggered on allies who follow the Path of Harmony. This somewhat limits his tactical flexibility when paired with certain other support characters.
Skill Priority
Ultimate = Skill > Talent > Basic Attack
Leveling Sunday’s Skill is the top priority as it directly increases the DMG% multiplier for his targeted ally, forming his core combat value. Enhancing his Ultimate remains highly valuable as it scales the CRIT DMG bonus provided by “The Beatified” state, making it the recommended second priority after his Skill.
Sunday Materials
- Ascension Materials
Tatters of Thought x 15
Fragments of Impression x 15
Shards of Desires x 15
Chordal Mirage x 65
Credit x 308,000
- All Trace Node Materials
Firmament Note x 15
Tatters of Thought x 41
Celestial Section x 72
Fragments of Impression x 56
Heavenly Melody x 139
Shards of Desires x 58
Lost Echo of the Shared Wish x 12
Tracks of Destiny x 8
Credit x 3,000,000
Best Light Cone for Sunday
Here are the most effective Light Cone options to maximize Sunday’s supportive capabilities:
| Light Cone | Stats | Wht It Fits |
| A Grounded Ascent 5★ (Signature) | HP: 1164ATK: 476DEF: 529 | Consistently maintains a 3-turn Ultimate rotation, providing crucial Skill Points. |
| But the Battle Isn’t Over 5★ | HP: 1164ATK: 529DEF: 463 | This light cone quickly stacks up to 5 layers. When attacking 3+ targets, it provides additional SPD buffs, enhancing field presence and action frequency. |
| Earthly Escapade 5★ | HP: 1164ATK: 529DEF: 463 | Offers substantial CRIT Rate and CRIT DMG boosts to allies, perfectly complementing Sunday’s own CRIT-focused buffs. |
| Past and Future 4★ | HP: 952ATK: 423DEF: 396 | Delivers significant DMG enhancement to the target ally following Sunday’s Skill usage. |
Pro Tips: Maximize your in-game advantage with Enjoygm Top-up service – the most efficient way to boost your Oneiric Shard reserves!
Best Relics and Planar Ornaments for Sunday
- Outer Relics
Sacerdos’ Relived Ordeal (Best-in-Slot)
Provides 36% CRIT DMG from 4-piece set
Offers a 9%+ damage increase for standard DPS carries
Eagle of Twilight Line (Speed Specialist)
Requires a Wind set main DPS and synchronized energy rotation
Currently only recommended for E2 Feixiao with Wind set
- Inner Relics (Planar)
Lushaka, the Sunken Seas (Primary Recommendation)
Boosts single-target ATK and Energy Regeneration Efficiency
Perfectly aligns with Sunday’s single-target support role and improves energy cycle
Fleet of the Ageless / Broken Keel (Alternative Options)
Easier to obtain with high availability rates
Provide team-wide ATK or CRIT DMG bonuses
When paired with Sunday’s signature Light Cone, Energy Regeneration Rope alone enables 3-turn Ultimate rotationAlternative
Main Stats and Sub Stats Priority
| Body | CRIT DMG |
| Feet | SPD |
| Sphere | HP / DEF |
| Rope | Energy Regeneration |
| Sub-Stats Priority | CRIT Rate/CRIT DMG > SPD > HP / DEF |
Best Teams for Sunday
| Best Team | Sunday + Phainon + Cerydra + Dan Heng Permansor Terrae | Phainon, buffed by Cerydra and Sunday, achieves peak performance as his Souldragon summon fully activates Sunday’s enhanced 50% DMG bonus and synergizes with his kit. |
| Hypercarry Team | Sunday + Mydei + Tribbie + Luocha | Sunday excels as a universal buffer in hypercarry teams but falls short in Break/DoT compositions where specialized supports outperform him. |
Recommended Eidolons
- E1 | ★★★★★ (Excellent)
Significantly enhances performance with summon-based DPS (e.g., Jing Yuan). Optimal if the team includes or plans to include summon-centric characters.
- E2 | ★★★★☆ (Good)
Improves early-game Skill Point economy and boosts the main DPS’s damage output.
- E4 | ★★★★☆ (Good)
Smoothens energy rotation, reducing reliance on a strict 3-turn Ultimate cycle and ensuring more consistent uptime for Ultimate buffs.
- E6 | ★★★★★ (Excellent)
Greatly alleviates CRIT stat requirements for the main DPS, effectively raising their damage ceiling.
Conclusion
Sunday establishes himself as a premier Harmony character, delivering exceptional value through versatile team-wide offensive support. His capabilities prove most impactful when empowering hypercarry compositions, where his coordinated buffs create remarkable damage amplification.
To accelerate your progress in building Sunday, consider utilizing available HSR redemption codes for additional resources through official channels.
