For centuries, Harbinger Zero was nothing more than a myth. A missing number buried in ancient Fatui records. A position that supposedly never existed. Until Pierro walks into a Harbinger meeting with a stranger at his side. Her name is y/n. She answers directly to the Tsaritsa, stands as Pierro’s equal, and carries enough secrets to make every Harbinger in the room suspicious. She returned to Teyvat with one goal: restore the kingdom she lost long ago. Dealing with the Fatui was supposed to be the easy part. But as the Harbingers begin digging into Zero’s mysterious past, they notice something strange. Her changing eyes. Her shifting behavior. The feeling that sometimes, when they speak to y/n, someone else is looking back. After all, y/n didn’t return to Teyvat alone. Seven ancient guardians returned with her.