Karma was a cancerous thing, terminal and infectious to the soul; something that Xiao believes you don't deserve to suffer from.

Thus, he isolates himself. And he kills, and kills— And kills.

The souls of the damned taken him. No matter how many times you speak, he does not answer your calling so, it's natural you search for him. And what rests in Dunyu Ruins is the Vigilant Yaksha himself, corpses of hilichurls at his feet.

He's animalistic, barely hanging on. Soothe his soul, if you can.