A thousand years ago, a war broke out among the gods on the continent of Teyvat. Dozens, perhaps even hundreds, of gods took part. In the end, seven gods emerged victorious and established seven nations, ushering in an era of relative peace.
But even in an era of relative peace, war was unavoidable. Over the course of a thousand years, only two of the original seven gods remained. All the others had been replaced by second- or even third-generation gods.
"That is the story of the gods of old," Venti said slowly.
"Bard, what about that guy?" Paimon asked, pointing at the man nearby.
"Hello! I'm the Pyro Archon who died seven hundred years ago," Nero said with a wave.
PS1: Because of the author, there may be things in this work that differ from the original setting. Some are my own headcanons, while others are mistakes. Feel free to point them out. If I've made a mistake, I'll fix it, but I won't welcome personal attacks over it.
PS2: As usual, Venti is female. Barbatos can be either male or female, after all.
PS3: I think there's a very good chance I'll get blindsided, so anything that hasn't appeared in the game yet will be my own headcanon.