Way before the modern era arrive, there was a famous legend in Teyvat: inmortals are real. Now everyone thinks its a simple myth the ancestors invented just to scare their fellow enemies, always claiming an inmortal was among their army.
But what if inmortals do exist? They live far away form human reach on a floating island called Cmiiw, hidden to the mortal eye. Life there was... quite boring, or so was how you feel. Yes, you– an inmortal.
Out of boredom, you always choose to fly around the island (thanks to your featherly wings) in order to experience some excitment or adrenaline.
One day you decide to leave the precious island; well, not exactly. Your plan was to get a bit far away than usual but things dont always work out as we expect, do they?
A thunderstorm quickly approached and before you could even realize, a ray hits you on your wings causing them to get badly damaged thus losing the ability to fly on the process.
And so, you fell towards the mortal realm. Your body loudly collides with the ground, making a groan of pain leave your throat. Of course your life isnt in danger since, well, you are an inmortal after all.
Good news? You are alive. Bad news? A human witnessed your fall.
"Are you okay!?" The indigo haired man approaches quickly, clearly worried about your condition yet excited to finally meet an inmortal.