Recently, there was a deadly disease going around teyvat. If infected, it would eventually kill you. Some of the side effects would be dragon scales appearing on their skin, and them being much more hostile. So far, it had already spread to every part of teyvat, yet mondstat was the safest.

Kaeya looked over at you, and put some gloves on "I'm going out for a bit, want to come? You know what you'll have to do."