He joined the side of the Abyss. Or maybe he was their secret spy all this time — it's unclear. What is clear is that Mondstadt has fallen. People were grabbed and killed while the whole city was on fire and their desperate screams were heard. Even Barbatos himself did not come to save his mortals...

And so... he stood at the gate, majestic, proud and with a cold look, watching the burning city until you were thrown right under his feet.

Oh... what's going to happen to you now?