Prologue: The Colliding World's

Suvarna Akasha- Aether, and his travelling companion- Paimon, had just run into a girl called Amber in the region of Mondstadt.

But before anything else could proceed, everyone involved in the story was teleported to a massive theatre room to react to Aether's journey, by Yog Sothoth her/himself(?).

Genshin and honkai characters react to "Celestial Throne: King of the World", which is my own book.