Rainbow Serpent’s Rain Bow is a 4-star bow with a simple promise: fix Energy Recharge on your off-field bow unit and reward them with a sizable ATK steroid whenever their abilities hit from the sidelines. It is free, time-limited, and clearly tuned for a small set of characters rather than the entire bow roster.
Rainbow Serpent’s Rain Bow stats and passive
| Rarity | Base ATK (Lv. 90) | Substat (Lv. 90) | Weapon skill |
|---|---|---|---|
| 4★ Bow | 510 | 45.9% Energy Recharge | Astral Whispers Beyond the Sacred Throne – ATK is increased for 8s after the wielder’s attacks hit an opponent while they are off-field. |
At refinement 1, the passive grants a 28% ATK increase for eight seconds. At refinement 5, that jumps to 56%. The trigger condition is very specific: the character must be off-field when their attack connects. That means turret-style skills and persistent bursts are ideal. On-field normal and charged attacks do nothing for this passive.
The combination of 510 base ATK and 45.9% Energy Recharge puts the bow in the same general stat tier as other modern 4-star ER weapons, but with a pure personal-damage passive instead of team utility or particles.
How to get Rainbow Serpent’s Rain Bow and refinements
Rainbow Serpent’s Rain Bow comes from the Soulblazers’ Snowbound Journey flagship event in Version 6.2 Luna III. The key thresholds are:
- 200 Blazing Spirit Points – unlocks the bow itself.
- 1000 Blazing Spirit Points – grants all Refined Heart materials to reach refinement 5.
Blazing Spirit Points are awarded for clearing the event’s minigames and combat stages. The weapon follows the usual event-weapon pattern: a limited window to obtain both the base weapon and its refinements, and after the event ends, there is no clear rerun path for Refined Heart.
Ascension costs are standard for a 4-star bow. Fully raising it to 90 requires 150,000 Mora, Night-Wind’s Mystic materials in all four tiers, plant drops like Refractive Bud, Bewildering Broadleaf, and Illusory Leafcoil, plus the Warrant enemy drop line (Tattered, Immaculate, Frost-Etched).
What kind of characters want this bow
Rainbow Serpent’s Rain Bow does three things at once:
- Raises the user’s base attack to a solid 510.
- Pushes Energy Recharge close to 46% from a single weapon slot.
- Hands out up to 56% bonus ATK whenever off-field attacks connect.
That profile naturally fits three conditions.
1. The character’s damage scales with ATK. Units that scale on HP or DEF gain very little from the passive. They still enjoy the Energy Recharge, but the identity of the weapon is wasted.
2. They do real work while off-field. The passive is trivial to trigger on characters that leave behind turrets, constructs, or lingering bursts. It is awkward on the main on-field DPS, where most damage comes from normal or charged attacks.
3. They are sub-DPS or supports who need Burst uptime. High Energy Recharge and a short, repeatable ATK buff are most valuable in quick-rotation teams that rely on consistent burst cycles.
That framing immediately narrows the field. Among all bow characters, only a handful check every box and are worth building around Rainbow Serpent’s Rain Bow.
Best Rainbow Serpent’s Rain Bow users
Jahoda
Jahoda is the clearest match for the weapon’s design. She is a 4-star Anemo bow unit who provides off-field healing and damage through her Elemental Skill and Burst, both of which scale with ATK. Keeping her Burst on cooldown is important, and she wants a healthy Energy Recharge baseline without sacrificing too many offensive substats.
Rainbow Serpent’s Rain Bow gives Jahoda:
- Enough Energy Recharge from the weapon alone to loosen ER requirements on artifacts.
- A significant ATK buff that directly boosts both her off-field damage and Burst-scaling healing.
Her rotation naturally triggers the passive: cast Skill or Burst, swap away, and let her lingering effects connect while she is off-field. For players who do not own a 5-star support bow, this is effectively her go-to F2P option.
Ororon
Ororon is built around an off-field Elemental Burst that delivers most of his personal damage while another character is on the field. That alone lines up perfectly with Astral Whispers Beyond the Sacred Throne.
In typical Ororon teams, maintaining Burst uptime is non‑negotiable, and he often competes for weapons like Favonius Warbow to solve energy problems. Rainbow Serpent’s Rain Bow offers a different angle:
- The Energy Recharge substat stabilizes his Burst without demanding ER sands.
- The passive dumps a very high ATK percentage directly into his Burst damage window.
The trade-off is clear. Favonius Warbow feeds the entire team with extra particles and demands CRIT investment to trigger. Rainbow Serpent’s Rain Bow focuses on Ororon’s own numbers. In groups that already have strong batteries or do not rely on his weapon for team energy, the event bow is a strong pick and visually fits his “Masters of the Night Wind” aesthetic almost too well.
Fischl
Fischl’s Elemental Skill, Oz, is one of the classic off-field damage engines in Genshin Impact. Oz’s Electro shots count as the equipping character’s attacks, so they continuously refresh Astral Whispers’ ATK buff while Fischl is off-field.
On Fischl, Rainbow Serpent’s Rain Bow behaves like this:
- Energy Recharge is more of a luxury than a necessity, since her Burst has a low cost and her Skill already generates Electro particles.
- The ATK buff, however, feeds directly into Oz’s damage and any Burst damage she does weave in.
Other 4-star options like Stringless and Alley Hunter still compete, especially in reaction-focused teams, but for players missing those or preferring a simple ER + ATK package that feels good at R5, the event bow is entirely viable. It essentially covers all Fischl’s energy needs and lets her funnel artifact stats into ATK, CRIT, and Elemental Mastery.
Collei
Collei’s role in modern teams is primarily Dendro application via her Skill and Burst. Neither of those hits especially hard, but both snapshot ATK and deal damage while she is off-field, so they satisfy Rainbow Serpent’s Rain Bow’s trigger condition cleanly.
On Collei, the bow provides two advantages:
- Higher Burst uptime in rotations that lean on her for consistent Dendro application.
- Noticeably better personal damage from her Skill and Burst, even if that is not the main reason she is picked.
Collei will never turn into a hyper-carry with this weapon, and Dendro reaction teams still care more about her uptime than her raw damage. But the bow is an efficient, low-friction F2P choice if she is a regular in your rosters and you do not need her to hold Favonius Warbow for team energy.
Venti
Venti’s interaction with Rainbow Serpent’s Rain Bow depends on how he is played.
In the “old-school” Venti pattern, he casts his Burst, vacuums enemies, and immediately leaves the field until the next rotation. In that mode, his Burst is doing nearly all the work while he is off-field, which means Astral Whispers stays active, and the weapon functions as an ER bow that also boosts his own output.
In the newer Hexerei style, where players keep Venti on-field to perform empowered aimed shots during his Burst, the bow falls off. The passive stops aligning with his main source of damage, and he instead wants weapons that emphasize on-field personal DPS or team buffs.
So Venti is a conditional pick. If he is a pure Burst-and-swap support in a team that can spare his weapon slot for personal damage, Rainbow Serpent’s Rain Bow is serviceable. If he is built as an on-field Anemo driver, other bows are more appropriate.
Other workable but lower-priority users
A few more bow characters can make the passive work mechanically but do not take full advantage of the kit.
- Faruzan can trigger the ATK buff with her off-field damage at C6 and appreciates Energy Recharge, but her core value is Anemo resistance shred and team buffs, not her personal hits. Her major buff scales off base ATK rather than buffed ATK, so the passive does not strengthen her support capabilities.
- Kujo Sara shares the same issue. Her team-wide ATK buff is based on her base ATK and ignores bonus ATK from weapon passives. Rainbow Serpent’s Rain Bow raises her own numbers but does not improve the buff that justifies her slot.
- Amber can technically trigger the passive with Baron Bunny explosions or her Burst while off-field. The bow then becomes a straightforward ER + ATK stat stick for niche Amber builds, but nothing in her kit uniquely rewards Rainbow Serpent’s Rain Bow over other accessible options.
- Gorou benefits from Energy Recharge but scales on DEF and cares little about ATK. The passive is mostly wasted, making it an inferior choice next to purely supportive options.
These characters can hold the bow without issues if nothing better is available, but they are not the main pieces it is tuned around.
Who should not use Rainbow Serpent’s Rain Bow
The list of poor candidates is longer than the list of good ones. Knowing who should avoid the bow helps narrow your choices quickly.
- On-field main DPS bow users such as Tighnari, Lyney, Ganyu in freeze or melt teams, Tartaglia, Yoimiya, and Sethos derive most of their damage from normal or charged attacks while they are on-field. They cannot reliably trigger an off-field-only passive and generally prefer raw ATK/CRIT weapons or tailored 5-star signatures.
- HP-based supports or sub-DPS units like Yelan and healers who scale on HP gain almost nothing from a large ATK buff. The Energy Recharge is nice but does not outweigh weapons that interact directly with their main stat.
- DEF-scaling supports such as Gorou, as mentioned earlier, waste the passive and only leverage the ER.
In many team compositions, Favonius Warbow will still be the correct call for pure utility. Its Energy Recharge substat and particle generation benefit the entire squad rather than just one unit’s personal damage, and its passive can be triggered with careful CRIT rate building. Rainbow Serpent’s Rain Bow, in contrast, is best when you are comfortable with team energy and want to push an off-field bow unit’s individual numbers higher.
For players who clear Soulblazers’ Snowbound Journey, Rainbow Serpent’s Rain Bow is worth claiming and refining to R5. It will not replace high-end 5-star options, and it is mediocre on most of the cast, but in the hands of Jahoda, Ororon, Fischl, and Collei, it quietly solves energy issues and adds a noticeable chunk of damage or healing without demanding complex setups.
