辛炎

Redhorn Stonethresher

Wolf's Gravestone, Serpent Spine, Song of Broken Pines, Snow-Tombed Starsilver, Skyward Pride

<sands> ATK%
<goblet> Physical DMG Bonus
<circlet> CRIT Rate / CRIT DMG

CRIT DMG / CRIT Rate
ATK%

1) Normal Attack: Dance on Fire
2) Elemental Burst: Riff Evolution
3) Elemental Skill: Sweeping Ferver

While the Pale Flame will lead to greater damage output than the 2-set Physical Set build with its stacks, it is very difficult to gain them with Xinyan's skill despite its pyro pulses. The 2-set Physical Set build will be far more consistent.

Favonius Greatsword has a chance to generate Energy Particles for the entire team whenever the holder hits a CRIT. Xinyan's C2 eliminates the need to build CRIT Rate. Holder needs to be on-field.

Wolf's Gravestone grants an ATK% buff to the entire party whenever the holder hits an opponent under 30% HP. Holder needs to be on-field. Consider how often you'll be able to utilize its passive before picking this one.

<sands> Energy Recharge or DEF%
<goblet> DEF%
<circlet> DEF% or CRIT Rate

Energy Recharge
DEF%

1) Elemental Skill: Sweeping Fervor
2) Elemental Burst: Riff Revolution
3) Normal Attack: Dance on Fire

4-piece Instructor is able to share Elemental Mastery for the entire party, most importantly to Hu Tao or Yoimiya making it Xinyan's best set for buffing. This comes at the cost of a slimmer shield and lower Energy Recharge due to it's 4-star maximum rarity.

Sacrificial Greatsword
Maximizes uptime. The shield is best considered at Level 3 which can be casted immediately after Bursting or hitting multiple enemies. If the additional Elemental Skill charge is used prematurely, you may lose the stronger shield and gain a weaker one.
Whiteblind
Maximizes shieldstrength, but will require strong investment into Energy Recharge. Has enough Defence to allow for an Energy Recharge sands to be run.

Favonius Greatsword

<sands> DEF% or Energy Recharge
<goblet> DEF%
<circlet> DEF%

DEF%
Energy Recharge
CRIT Rate

1) Elemental Skill: Sweeping Ferver
2) Elemental Burst: Riff Evolution
3) Normal Attack: Dance on Fire

For the sake of reliability, this playstyle is only recommended when owning Xinyan at C2 or higher. This playstyle is generally only worth using if looking to run the Tenacity of the Millelith set when Diona or Zhongli are not available.