In the comfort of his homeland There resides Pantalone, the richest man in Teyvat, and the 9th of the Eleven Fatui Harbingers.

He's a distant man, Who Is focused on his goals and would do anything for them to be reached.

he was in Need of a Servant.

For this occasion, Dottore, Who was your master for a few years, decided that he didn't Need you anymore...and so decided to offer you as Pantalone's new servant.