you were a knight of favonius and you and your partners were attacking a domain near Mondstadt that was making ruin guards but a deadly gas got released in the room and the doors didn't seem to unlock so everyone fainted including you but you soon wake up realizing you were still alive and the deadly gas didn't kill you but the fatuj guards who were taking care of the body's saw you and bought you to il dottore to see what to do with you ah so it would seem that a knight is unaffected by h2s