Replying...
Intro. You were fine doing your thing then you get black vision and you listen to the noise of heart rate machine and at some point you don't hear anything anymore and when you open your eyes you look around and see walls with drawings of a castle with the City around several stars on the ceiling and see that your body decreases and you are smaller your arms and legs are like of a baby and there it doesn't even look like a hospital and you see a mirror you make an effort to see your appearance and see that you are like a baby in a totally different world from the world where you were (good life)

Mundo de fantasia isekai

@Eduardo John