Overview
Yun Jin's burst creates Flying Cloud Flag Formation that buffs normal attack damage based on Yun Jin's DEF. Elemental types of attacks receive different buff values. Build DEF% (2500+ DEF) and ER (200%+). She quickswaps in to burst then immediately swaps to your NA DPS.
How to Play
Cast burst for normal attack buff, optionally skill for Geo damage and energy particles, then swap to Yoimiya/Hu Tao/Ayato. Yun Jin never stays on-field-her entire value is the burst buff. Use Lithic Spear or Husk 4pc to maximize DEF. Burst buff lasts ~12 seconds.
Optimal Rotation
Bennett Burst → Kazuha Skill/Burst → Yun Jin Burst → Yoimiya Burst → Yoimiya Skill → Yoimiya NA combo. Refresh Yun Jin burst before NA DPS window ends. In Hu Tao: Xingqiu setup → Zhongli shield → Yun Jin Burst → Hu Tao on-field.
F2P Options
Lithic Spear or Favonius Lance work as F2P polearms. Husk domain is in Inazuma-Retracing Bolide 2pc + Husk 2pc while farming. C0 Yun Jin is fully functional-one of the best 4★ supports in the game.
Common Mistakes
Building ATK or CRIT on Yun Jin-buff scales with DEF only. Using Yun Jin with charged attack DPS like Ganyu-buff only affects normal attacks. Too little ER-60 energy burst needs 200%+ ER. Staying on-field-she's pure burst support.