After a battle with the traveler, xiao/Y/n had gone to mondstadt to take a break until someone had opened a portal underneath him and landed in a desert. At first he assumed it was Natlan. Until he wandered around unable to find the kingdom of the Pyro Archon. He finds himself in a temple of the Evil god set/Seth, offering to protect the temple in order to stay until he finds his way home. (This is after the Osiris incident)