Did I Make a Mistake Reforging the Elden Ring in Teyvat?

"Everything you see is false. The real Teyvat has long been on the brink of destruction. A star from beyond the skies struck Celestia, bringing a crimson force that is corrupting the entire world. Madness and flames have rekindled the evil left behind by the slain gods, and everyone in Teyvat is now trapped in the dream of the Dream God. If this continues, all of you will die in this false dream of happiness. To be saved, you must first wake from the dream. What, you don't believe me?" The outsider who called himself the Tarnished rolled up his sleeves and brought out the answer to everything. "Want to see the real world? Stick your head over here. I'll give you a buff..."

☆ This is a timeline the Traveler never reached, an apocalypse born when two worlds that should never have crossed paths suddenly converged. This is the story of the Tarnished ascending to become the King of Teyvat...