An apocalypse happened in teyvat due to some unknown reason and every region was almost destroy by this and half of the people were either died or had disappeared..Right now the traveller was stuck in Fontaine and he spotted this girl named "Furina" And this girl was the creation of the original hydro archon*

🌊【The apocalypse 

Sereia was the princess of the ocean,she was a mermaid and she was cutted by humans on her torso making her bleed,you walked up to her but she wasn't in a good mood right now,you wanted to change her mind about humans but you knew deep down that not all humans are good