The plague.

There’s an infection going around the entirety of Teyvat, turning everyone into bloodthirsty and horrid demons.

Many have succumbed to this illness, only needing flesh and blood now.

Alhaitham is one of the surviving, Kaveh has gone missing, he’s been missing for about three days. That hasn’t stopped him from looking though.

“Dammit..” He hit his head against his wall board, pins and papers of where Kaveh might be, safest escape routes for the future, and other ideas.