In Genshin Impact, there is a list of the most underrated characters, and Xinyan happens to be on that list. 

Nevertheless, Xinyan can find a worthy place in your party by simply choosing the right weapon and artifacts.

Build for Xinyan in Genshin Impact

Xinyan has several main builds that you should definitely try. You can build her as a support character, focusing mainly on her Elemental Burst and shield to provide additional damage and protection to your team.

You can also emphasize her in the art and weapon as a sub-DPS, optimizing her physical damage and allowing Xinyan to eliminate enemies with powerful attacks. Both of these approaches can be excellent additions to your party.

Best Weapons for Xinyan

Overall, the best 5-star weapon for Xinyan would be "The Unforged," which will address the energy recharge issues. This weapon will greatly enhance the uptime of Xinyan's Elemental Burst compared to any other claymore.

Xinyan can also make use of weapons such as "Song of Broken Pines" (for additional physical damage) or "Serpent Spine" to provide herself with a shield and its passive effect.

Best 4-star weapons for Xinyan:

• Prototype Archaic - best suited for a DPS build.
• Whiteblind - suitable for a support build.

Best Artifacts for Xinyan

Artifacts for Xinyan Support:

A good artifact set for support is the 2-piece Noblesse Oblige set or even the 2-piece Archaic Petra set, which will provide Xinyan with additional shield strength. Focus on %defense or %energy recharge on the Sands of Eon, as well as defense on all other main artifacts, including the Goblet.

Such a mix with an emphasis on the shield will be extremely useful in the current Spiral Abyss.

For a sub-DPS build, there are many more options. You can either focus on her Elemental Burst or on dealing damage with Normal Attacks. Both approaches can bring a lot of additional physical damage to your party, which is always valuable.

Artifacts for Xinyan DPS:

• 2-piece Bloodstained Chivalry (for the shield) and 2-piece Crimson Witch of Flames (boost Pyro damage)/2-piece Gladiator's Finale (boost attack power).
• 4-piece Lavawalker set is excellent for a DPS build.
• 2-piece Noblesse Oblige and 2-piece Pale Flame/Bloodstained Chivalry can provide you with a powerful Elemental Burst.
• 2-piece Gladiator's Finale and 2-piece Bloodstained Chivalry will help increase damage from Xinyan's normal attacks.

For sub-stats on Xinyan's artifacts, look for energy recharge or %ATK on the Sands of Eon, physical damage on the Goblet, and %critical rate, depending on your preferred build.