Overview
Xinyan's skill creates a shield that buffs Physical DMG for characters inside it. Her burst deals Physical AoE damage. Shield strength scales with DEF and the number of enemies hit by skill. She's niche but provides unique Physical DMG buffing that Rosaria doesn't offer.
How to Play
Hit multiple enemies with skill for a stronger shield (Level 3 shield at 2+ enemies). Cast burst for Physical AoE damage. Apply shield buff before Eula or Razor damage windows. Xinyan needs to be built around Physical teams, she's not a general support.
Optimal Rotation
Xinyan Skill (hit 2+ enemies for Level 3 shield), Rosaria Skill/Burst, Eula Skill/Burst, Eula on-field. Physical DMG buff persists while shield is active. Refresh Xinyan shield before it breaks.
F2P Options
Snow-Tombed Starsilver or Prototype Archaic work well. Xinyan is a 4★ from Liyue. C2 guarantees Physical crit on burst, strong for burst damage. She's niche but functional in Eula teams as a Physical buffer.
Common Mistakes
Hitting only one enemy with skill, Level 3 shield needs 2+ enemies. Building Pyro DMG instead of Physical DMG. Using Xinyan outside Physical teams wastes her shield buff. Not refreshing shield before it expires during Eula's burst window.