Ruan Mei Complete Harmony Guide
Version: 2.7+ | Last Updated: 2026-02-10 | Sources: Game8, VG247, Lootbar
Overview
Ruan Mei is a 5-star Ice Harmony character who buffs the entire party's DMG, SPD, Break Efficiency, and delays enemy recovery after Weakness Break.
Why Ruan Mei is SS Tier Support
- Party-wide DMG buff (up to 68%)
- SPD buff to entire team
- Break Efficiency increase (50%+)
- Delays enemy recovery after Weakness Break
- Deals bonus break DMG when enemies recover
- Universal - works with any team
Key Mechanics
Skill: String Sings Slow Swirls
- Increases party SPD and DMG
- Lasts 3 turns
- SP-positive playstyle (Skill → Basic → Basic → Skill)
Ultimate: Petals to Stream, Repose in Dream
- All allies gain RES PEN
- Enemies have delayed Weakness Break recovery
- When enemies recover, Ruan Mei deals bonus break DMG
Talent: Somatotypical Helix
- Party gains Break Efficiency based on Ruan Mei's Break Effect
- Cap: 50% Break Efficiency at 180% Break Effect
Best Relic Sets
Main Build
| Slot |
Set |
Reason |
| 4pc |
Watchmaker, Master of Dream Machinations |
Break Effect + party buff |
| 2pc |
Sprightly Vonwacq |
Action advance at start |
Alternative Ornaments
- Penacony, Land of the Dreams (ER + team DMG)
- Broken Keel (Effect RES + team CRIT DMG)
Main Stats
| Piece |
Main Stat |
Notes |
| Body |
HP% or DEF% |
Survivability |
| Feet |
SPD |
Always |
| Sphere |
HP% or DEF% |
Survivability |
| Rope |
Energy Regen |
Always |
Substat Priority
- Break Effect ★★★ (until 180% total)
- SPD ★★★
- HP% ★★
- DEF% ★★
Target Stats
| Stat |
Target |
| Break Effect |
180% (160% from substats + 20% from trace) |
| SPD |
134+ |
| HP |
3800+ |
| DEF |
1000+ |
Best Light Cones
| Rank |
Light Cone |
Notes |
| 1 |
Past Self in Mirror (Sig) |
Best overall, ER + break buff |
| 2 |
In Pursuit of the Wind |
Break Effect + action advance |
| 3 |
Memories of the Past |
Break Effect + ER |
| 4 |
Meshing Cogs (4★) |
F2P ER option |
| 5 |
But the Battle Isn't Over |
DMG buff |
Team Compositions
Super Break Team
- Ruan Mei + Trailblazer (Imaginary) + March 7th (Hunt) + Gallagher
- Maximizes Break damage
- Firefly also excellent
Kafka DoT Team
- Ruan Mei + Kafka + Black Swan + Huohuo
- Break delay + DoT synergy
Universal DPS Support
- Ruan Mei + Any DPS + Any Support + Sustain
- She works with everyone
Recommended DPS Partners
| Character |
Synergy |
Notes |
| Firefly |
★★★★★ |
Perfect Break synergy |
| TB Imaginary |
★★★★★ |
Super Break focused |
| Boothill |
★★★★★ |
Break specialist |
| Kafka |
★★★★ |
DoT + Break delay |
| Any DPS |
★★★★ |
Universal buffs work everywhere |
Trace Priority
| Priority |
Trace |
Reason |
| 1 |
Skill |
Core buff ability |
| 2 |
Talent |
Break Efficiency sharing |
| 3 |
Ultimate |
RES PEN + Break delay |
| 4 |
Basic |
Lowest priority |
Gameplay Tips
- Break Effect Goal: 180% total (160% from gear + 20% from Bonus Ability)
- Skill Rotation: Skill → Basic → Basic → Skill (SP positive)
- Ultimate Timing: Before DPS breaks enemies
- Speed: Go first to apply buffs before DPS acts
- Universal: She has no bad teams
Eidolon Analysis
| E |
Value |
Effect |
| E0 |
★★★★★ |
Already complete |
| E1 |
★★★★ |
Ignores DEF on break |
| E2 |
★★★★ |
More ATK buff |
| E6 |
★★★★★ |
Even more Break synergy |
Ruan Mei vs Other Harmony
| Aspect |
Ruan Mei |
Sparkle |
Robin |
| Buff Type |
Team-wide |
Single target |
Team-wide |
| Strength |
DMG + Break |
CRIT DMG + Action |
ATK + FUA |
| SP |
Positive |
Generates |
Neutral |
| Best For |
Universal/Break |
Hypercarry |
FUA teams |
References