Honkai Star Rail: Ruan Mei Best Build Guide, Kit & Teams

ATK

Threading Fragrance

• Deals Ice DMG equal to 50% (100%) of Ruan Mei's ATK to a single target enemy

Skill

String Sings Slow Swirls

• After using her Skill, Ruan Mei gains Overtone, lasting for 3 turn(s). This duration decrease by 1 at the start of Ruan Mei’s turn. When Ruan Mei has Overtone, all allies’ DMG increases by 16% (32%) and Weakness Break Efficiency increases 50%

ULT

Petals to Stream, Repose in Dream

• Ruan Mei deploys a field that lasts for 2 turns. The field’s duration decreases by 1 at the start of her turn. While inside the field, all allies’ All-Type RES PEN increases by 15% (25%) and their attacks apply Thanatoplum Redbloom to the enemies hit. 
  When these enemies attempt to recover from Weakness Break, Thanatoplum Rebloom is triggered, extending the duration of their Weakness Break, delaying their action by an amount equal to 20% of Ruan Mei’s Break Effect plus 10%, and dealing Break DMG equal to 30% (50%) of Ruan Mei’s Ice Break DMG. 
  Enemy Thargets cannot have Thanatoplum Rebloom re-applied to them until their recover from Weakness Break.

TECH

Silken Serenade

• After using the Technique, gains Silken Serenade. At the start of the next battle, automatically triggers the Skill for 1 time(s) without consuming Skill Points.
  In Simulated Universe, when Ruan Mei has Silken Serenade, the team actively attacking enemies will always be regarded as attacking their Weakness to enter battle, and this attack can reduce all enemies’ Toughness regardless of Weakness types. When breaking Weakness, triggers Weakness Break Effect corresponding to the attacker’s Type. For every Blessing in possession, additionally increases Toughness-Reducing DMG of this attack by 100%. And after breaking an enemy target’s Weakness, additionally deals to the enemy target Break DMG equal to 100% of Ruan Mei’s Ice Break DMG.

TALent

Somatotypical Helix

• Increases SPD by 8% (10%) for the team (excluding this character). When allies Break an enemy target’s Weakness, Ruan Mei Deals to this enemy target Break DMG equal to 60% (120%) of her Ice Break DMG.

Trace 1

Inert Respiration

• Increases Break Effect by 20% for all allies.

Trace 2

Days Wane, Thoughts Wax

• Ruan Mei regenerates 5 Energy at the start of her turn.

trace 3

Candle Lights on Still Waters

• In battle, for every 10% of Ruan Mei's Break Effect that exceeds 120%, her Skill additionally increases allies' DMG by 6%, up to a maximum of 36%.

Past Self in Mirror

• Increases the wearer's Break Effect by 60%. After the wearer uses their Ultimate, increases all allies' DMG by 24%, lasting for 3 turn(s). Should the wearer's Break Effect exceed or equal 150%, 1 Skill Point will be recovered.
  At the start of each wave, immediately regenerates 10 Energy for all allies. Effects of the same type cannot stack.

Dance! Dance! Dance!

• When the wearer uses their Ultimate, all allies' actions are Advanced Forward by 16%.
  

  • Best option and can be argued that it's even on par if not better tha Ruan Mei's Signature. Although it doesn't offer the Break Effect, manipulating turns in Star Rail is one of the most important things, and with Ruan Mei's buffing capabilities, enemies just might not get a turn

Memories of the Past

• Increases the wearer's Break Effect by 28%. When the wearer attacks, additionally regenerates 4 Energy. This effect cannot be repeatedly triggered in a single turn.

  • A great alternative for Ruan Mei's signature, giving her a lot of Break Effect, making you reach that 180% way easier. A choice that you can't go wrong with.

Meshing Cogs

• After the wearer uses attacks or gets hit, additionally regenerates 4 Energy. This effect cannot be repeatedly triggered in a single turn.

Messenger Traversing Hackerspace

• 2-Piece: Increases SPD by 6%.
• 4-Piece: When the wearer uses their Ultimate on an ally, SPD for all allies increases by 12% for 1 turn(s). This effect cannot be stacked.

Thief of Shooting Meteor

• 2-Piece: Increases Break Effect by 16%.
• 4-Piece: Increases the wearer's Break Effect by 16%. After a character inflicts Weakness Break on an enemy, regenerates 3 Energy.

Broken Keel

• 2-Piece: Increases the wearer's Effect RES by 10%. When the wearer's Effect RES is at 30% or higher, all allies' CRIT DMG increases by 10%.

Fleet of the Ageless

• 2-Piece: Increases the wearer's Max HP by 12%. When the wearer's SPD reaches 120 or higher, all allies' ATK increases by 8%.

Talia Kingdom of Banditry

• 2-Piece: Increases the wearer's Break Effect by 16%. When the wearer's SPD reaches 145 or higher, the wearer's Break Effect increases by an extra 20%.